Table of Content

05 September 2016, Volume 36 Issue 5 Previous Issue    Next Issue

Geographic Distribution of Centenarians and Environmental Backgrounds of Longevity Regions in Hubei Province GONG Shengsheng，GE Lyulong，ZHANG Tao 2016, 36 (5):  727-735.  doi: 10.13284/j.cnki.rddl.002889 Abstract ( )   PDF (4918KB) ( )   Save With the Census data, we analyzed the distribution characteristics and the natural environmental backgrounds of longevity regions in Hubei in the past fifty years, using ArcGIS spatial-temporal analysis and SPSS mathematical statistics methods. The study showed that: During the past fifty years, the ratio of the centenarians between Hubei and the whole country had been lower than that of the population, and the gap with the average level of the whole country had been greater; The spatial difference of ratio of the centenarians in county area was obvious, the ratio of Hillock Farmland in Northern Hubei ranked the top, and the ratio of southwest mountainous region, Jianghan plain and hilly regions of southeastern Hubei grew rapidly; The center of gravity of the centenarians moved southeastward and gradually approached the geometric center and population mean center of the province. There were 29 relative longevity districts in the last 50 years, which were mainly distributed on the Hillock Farmland in Northern Hubei and plain-hill ecotone at the rim of the Jianghan plain, while others distributed in the low mountains and hills in northeastern, southeastern and southwestern Hubei. There were some nature-environmental features in those relative longevity districts, such as no intense heat in summer, no severe cold in winter and moderate rainfall, good airflow, lower altitude, flat terrain and soil rich in Mo, Mn, Zn and other trace elements. References | Related Articles | Metrics

Review of Domestic Research on Issues of Sports and Geographical Space Based on Human Geography Perspective CHEN Kunlun，LIU Xiaoqiong，CHEN Qingling，LI Jun 2016, 36 (5):  736-743.  doi: 10.13284/j.cnki.rddl.002877 Abstract ( )   PDF (618KB) ( )   Save Sports activities, as a main way to keep healthy, have been continuously becoming the focus of society and academic circles. Various disciplines are involved in sports research, of which the research on sports activities and geographical space expands the connotation of sports science. Based on collection and collation of domestic literature, this paper analyses the connotation of sports science, and then summarizes the topic for discussion about sports and geographical space from four aspects, including relations between sports talents, sports industry, sports activities and stadiums with geographical space. Research shows that sports talents, industry, activities and stadiums have strong geographic features and space directivity. The geographical distribution of sports talents is closely related to regional and urban culture and history. Sports industry is deeply influenced by the spatial distribution of basic-economic activities. The sports activities obviously have the characteristics of spatial heterogeneity. And the stadiums are an important kind of physical space in city. It is an important opportunity for the crossing of geography and sports science whose connotation is continuously developing. Human geography gains a competitive edge over these aspects such as disciplinary comprehension, perspectives, research methods and technical means. Therefore, it can help itself participate in sports research, and comprehensively explain and deeply analyze sports phenomenon. References | Related Articles | Metrics

Temporal Variation and Health Risk Assessment of Drought Disasters in Africa LI Chanjuan，YANG Linsheng，LI Hairong 2016, 36 (5):  744-752.  doi: 10.13284/j.cnki.rddl.002883 Abstract ( )   PDF (1250KB) ( )   Save This paper studied the time trend of drought disaster in recent 25 years in Africa and its health risks of 54 African countries. Inter-annual changes of drought frequency and affected rate per million people were analyzed with the data from 1990 to 2014 recorded in the International Disaster Database (EM-DAT). Based on four elements of disaster risk assessment, including hazard, exposure, vulnerability and adaptability, a health risk assessment model of drought disaster in Africa was established. In order to make quantitative health risk assessment of drought disaster, a multi-index comprehensive evaluation system was established and index weight was determined, combined with the main health effects of drought in Africa. The result showed that the occurrence of drought disasters in Africa was fluctuating from 1990 to 2014 due to the impacts of global climate change and large scale circulation anomalies. The main health effects of drought disasters, such as cholera and malnutrition, were significantly correlated to drought frequency, affected population, total population, percentage of the people with access to improved water source and sanitation facilities, percentage of the population in age from 0-14, proportion of rural population, political stability, and absence of violence/terrorism index. Owing to high drought frequency, population exposure, vulnerability and relatively weak disaster adaptation capacities, the high health risk areas were distributed mainly from Mali in West Africa to Somali in the corner of East Africa eastwardly, then to South Africa southwardly. Drought hazards were more severe in the areas with higher drought frequencies, and exposures were bigger in the areas with a larger total population, where human health threats or risks were more serious. Improvements to lavatories and sanitation facilities can upgrade the conditions of population’s drinking water, and reduce the prevalence of malnutrition, cholera and other water-borne diseases. Nations with high degrees of stability provided basic guarantees upon which to build a nation’s disaster prevention capacity and disaster adaptability. Rural populations and children under 15 years of age were more vulnerable population groups when facing drought disasters and/or food insecurity. Hence, the larger the proportion of the rural population was, and the more the children under 15 years of age were, the higher the malnutrition rate and drought risk would be. References | Related Articles | Metrics

Spatial Feature and Influence Factor Analysis of Health Care Microblog Users in the Pearl River Delta HUANG Yuxing，CHEN Zhongnuan，CHEN Yebin 2016, 36 (5):  753-760.  doi: 10.13284/j.cnki.rddl.002888 Abstract ( )   PDF (1827KB) ( )   Save It is important to learn the spatial features of the health care message producers and followers in the Internet world. We chose Sina microblog as the research object, which is very prominent for its Internet information flow, and selected the Pearl River Delta urban agglomeration as the sample source. On the basis of retrieval and content analysis, we separated the samples into two classes: producers and followers. We used social network analysis, spatial autocorrelation, and stepwise linear regression to learn the social network features of the producers and the spatial distribution features and influence factors of the followers. The results showed that: Firstly, the producers could build a local social network via the Internet. Differences were significant between groups but not between regions. Secondly, communication facilities and local medical level were the major factors for the spatial differentiation of the health care microblog followers. Finally, the spatial distribution of the followers was still limited by geographical factors. References | Related Articles | Metrics

Spatio-temporal Differences of Sexually Transmitted Diseases in China and Its Relationship with Economic Development: A Case Study of Gonorrhea and Syphilis YANG Zhen，WANG Nian，WANG Yu 2016, 36 (5):  761-766.  doi: 10.13284/j.cnki.rddl.002879 Abstract ( )   PDF (645KB) ( )   Save Sexually Transmitted Diseases (STD) is a kind of transmitted disease which is seriously harmful to human health. This paper, using the variation coefficient, the convergence test method and quantile regression, focused on the spatio-temporal characteristics and economic driving mechanism of gonorrhea and syphilis epidemic in China, 2004-2014. The results showed that: 1) The patient number of gonorrhea had decreased, but syphilis patients increased since 2004, the relative proportion was transformed, and the overall patient number continuously increased. 2) The regional difference of gonorrhea patients slightly increased, while the morbidity continuously decreased. There was obvious convergence of all regions, and gonorrhea morbidity was expected to gradually reach a lower level, while the syphilis epidemic was expected to gradually reach a higher level. 3) There was significant positive impact of economic development on different epidemic level, and in some regions it was shown that the more the economy developed, the more serious the epidemic was. It was considered that this research would provide some references for STD’s treatment and prevention in China. References | Related Articles | Metrics

Spatio-temporal Spreading Features and the Influence Factors of Dengue Fever in Downtown Guangzhou CHEN Yebin，LI Weihong，HUANG Yuxing，LI Xiaoge，HUA Jiamin 2016, 36 (5):  767-775.  doi: 10.13284/j.cnki.rddl.002881 Abstract ( )   PDF (2868KB) ( )   Save The study took downtown Guangzhou as the study area to observe the spatio-temporal spreading features of Dengue Fever (DF) at micro-scale. We used survey analysis, kernel density analysis and standard deviation ellipse method to explore the spatio-temporal diffusion features. Then, we tried to combine the cross correlation analysis method with geographical detector to analyze the effect of temperature, humidity, atmospheric pressure, different land-use types on dengue fever spread. The result showed that: Firstly, fever transmission had stage character significantly. The infection cases occurred predominantly in the spaces with poor environment and high population density, and spread rapidly. Secondly, the importation cases played a major role in the early stages of DF development. Thirdly, the old town, where there were relatively poor environment, large quantity of elderly population, complicated personnel, and convenient traffic, was a high-risk area of DF outbreak. Fourthly, the influence of temperature, humidity and atmospheric pressure on dengue fever spread was lagging. Temperature and humidity had positive correlationship with the spread of dengue fever, while atmospheric pressure had negative correlationship with the spread. Finally, the distribution of local residents had the closest association with dengue fever spread, and the interactive places among pond, farmland, grassland and public green space could increase the dengue fever infection risk. References | Related Articles | Metrics

Impacts of Tourist Resorts Development on the Sustainable Livelihoods of Relocated Residents: A Case Study of Chimelong International Ocean Tourist Resort ZUO Bing，CHEN Weibo 2016, 36 (5):  776-785.  doi: 10.13284/j.cnki.rddl.002887 Abstract ( )   PDF (1440KB) ( )   Save This study analyzes the impacts of a large-scale theme park-Chimelong International Ocean Tourist Resort (Chimelong) on the livelihoods of relocated residents under the framework of Sustainable Livelihood Approach (SLA). Based on the field research which combines interviewing with questionnaire methods together, this study analyzes the changes of livelihood capitals, livelihood strategies and livelihood outcomes of the relocated residents. The results find that residents’ physical capital and financial capital were greatly increased, meanwhile their wellbeing and ability to resist vulnerability were also got slightly improved. Residents, who had advantages in human capital, are more likely to achieve a high level of sustainable livelihood, but they often engaged in non-agricultural and non-tourism industries. Residents who worked for the local tourist enterprises had the lowest level of livelihood because of lack of human capital and social capital. The job opportunities the Chimelong offered to local residents were often low pay with high workload, and thus can’t help improve their livelihoods. The study thus advocates the government to establish effective public training programme and psychological intervene mechanism for relocated people to help them improve human capital. References | Related Articles | Metrics

Driving Forces of Rural Urbanization Led by Tourism Development: A Case Study of the Villages in Yuntai Mountain MENG Kai 2016, 36 (5):  786-794.  doi: 10.13284/j.cnki.rddl.002878 Abstract ( )   PDF (1632KB) ( )   Save Besides industrialization, it has been proved that tourism can lead rural urbanization. Therefore, under the tourism development, the driving forces and relationship among the forces of rural urbanization need new exploration. This paper, quoting “country-market-society” as the triple framework to explain the driving forces of rural urbanization led by tourism, taking the villages in Yuntai Mountain as case place, and using qualitative methods including observation and interview, proves that behind the rural urbanization led by tourism, the triple framework of country-market-society has changed in subject, effect and role, that is mainly embodied in that the market force has changed from supply to demand, and society force from organization to individuals. Based on the case research, this paper summarizes the triple driving force of rural urbanization led by tourism: local government, demand market, and villager individuals. The framework of “local government-demand market-village individuals” can correct and replenish the framework of “country-market-society” effectively. References | Related Articles | Metrics

Village Transformation in Peri-urbanization Region Based on Entrepreneurial City Theory:A Case Study of Chiling Village in Houjie Town of Dongguan City HUANG Yingmin，XUE Desheng 2016, 36 (5):  795-805.  doi: 10.13284/j.cnki.rddl.002875 Abstract ( )   PDF (1759KB) ( )   Save Since 1978, with the decentralization and the tax system reformation between central government and local government, the local government’s function has turned from managerialism to entrepreneurialism, and this transformation was great helpful to local urban and economic growth. However, after 30 years’ practice, the urban governance mode of entrepreneurialism has not been effective now. Taking Chiling village in Houjie town of Dongguan city as an example, this paper employs qualitative method to research village transformation based on entrepreneurial city theory, and summarizes its characteristics, mechanism and tactics. Main conclusions are as follows：1）The local village self-organization in peri-urbanization regional had entrepreneurialism behavior, and it was helpful to collective economic growth; 2）The villages system reform could be considered as a kind of governance modes, and rural economic development needed more governance, especially in economic crisis period; 3）Globalization directly changed local government entrepreneurialism behavior; 4）Compared to Western countries, the force of civil society is still weak in China. We should pay more attention to local institutional innovation when studying village transformation. References | Related Articles | Metrics

Spatial Distribution and Evolution of Metropolitan Travel Agency Industry: A Case Study of Shanghai City QIAO Haohao，WANG Zhaohui，ZHU Xiaoli，PU Bailing 2016, 36 (5):  806-814.  doi: 10.13284/j.cnki.rddl.002884 Abstract ( )   PDF (3966KB) ( )   Save Through the long-term data collection for Shanghai travel agencies, the spatial distribution pattern and its evolution of metropolitan travel agencies are studied with GIS analysis method, the influencing factors on the distribution and evolution of tourism industry are analyzed. The results are as follows: The spatial distribution pattern of the travel agencies in Shanghai was composed of "a gathering center with single core and two dispersal sub-centers ", and now the overall spatial distribution pattern has become "a ring core cluster with C-typed clustered secondary agglomeration rings". The expansion direction of the travel agencies is more obviously from the city center to the west and the southwest, while less to the east and northeast. The travel agencies continuously spread to all levels of business districts, scenic spots, and population accumulation areas. The evolution of the spatial distribution of the travel agencies is characterized by the process from low concentration to high concentration, and the degree of the agglomeration is increasing. Industrial spatial distribution of travel agencies and its evolution are influenced by the factors such as urban spatial patterns, population distribution, regional development, tourism resources, reception capacity, communications condition and so on. The analysis of the spatial distribution and evolution of travel agencies in metropolis would be helpful to metropolitan tourism industrial structure adjustment and industrial space layout. References | Related Articles | Metrics

Evaluation of the Internal Industrial Structure of Manufacturing in Fujian Province and Analysis on Its Evolution Tendency CHEN Kebi，YANG Chengfeng 2016, 36 (5):  815-822.  doi: 10.13284/j.cnki.rddl.002873 Abstract ( )   PDF (1350KB) ( )   Save In this paper, we use Gibbs-Mirtin diversification index, location quotient and the contribution rate of production value to quantificationally analyze the internal industrial structure of manufacturing in Fujian Province. The study is based on the panel-data of 20 manufacturing industries during 2005-2013. After making the quantitative analysis, this paper has pointed out the characteristics of industrial structure as well as its evolution about the internal industrial structure from perspectives of diversification of industrial departments and specialization of the competitive industries. The results show that the level of diversification of manufacturing industrial departments in Fujian has gradually increased these years, and the development of manufacturing industrial departments has become more balance. However, there are some differences among the manufacturing departments for the level of specialization. Some sectors of manufacturing industries, such as chemical fiber manufacturing, communications equipment, computers and other electronic equipment manufacturing are at high level of professionalization, showing a clear advantage compared with other sectors. However, the industrial advantages are not obvious, there are only 35% of the industrial departments whose location quotient are greater than or equal to 1, and manufacturing output values account for 46.71% of the total in the whole province. As for the tendency of evolution, potential industries such as non-metallic mineral products and agricultural and sideline products processing have been emerged. In addition, the advantage degree of the related industries has been improved in pair and the situation of the industrial professional development in Fujian seems pretty well. References | Related Articles | Metrics

Coupling Relationship between Population and Economy in Africa JIANG Daliang，REN Hang，ZHANG Linghua，CHEN Yingying，ZHANG Zhenke 2016, 36 (5):  823-832.  doi: 10.13284/j.cnki.rddl.002812 Abstract ( )   PDF (2484KB) ( )   Save In the regional study, one of the significant topics is the change in distribution of population and economy. By using the methods of regional gravity center, coupling index and geographic concentration index, with the population and GDP data in Africa in 2003-2012, the coupling characteristics of the population and the economy of Africa are elaborated in this paper. The conclusions are as follows: 1) The degree of geographic concentration of population was higher in eastern and western Africa, in comparison with that in central Africa; 2) The degree of geographic concentration of economy was lower in central Africa than that of the surrounding regions; 3) There existed a moderate positive correlation between the degree of geographic concentration of population and that of economy. 4) According to coupling index, Africa can be divided into five types: economic polarization, economy ahead of population, coordinate development, economy lagging behind population, and economy lagging far behind population. 5) The gravity centers of population and economy were both located in the southeast direction of the geometric gravity center of Africa. During 2003-2009, at the macro-trend, the coupling relationship of gravity center between population and economy was obvious; during 2010-2012, the extending tracks of gravity center of population and that of economy were different because of economic crisis and political insurrection. References | Related Articles | Metrics

Identifying Canopy Species of Subtropical Forest by Lightweight Unmanned Aerial Vehicle Remote Sensing YANG Long，SUN Zhongyu，TANG Guangliang，LIN Zhiwen，CHEN Yanqiao，LI Yu，LI Yong 2016, 36 (5):  833-839.  doi: 10.13284/j.cnki.rddl.002857 Abstract ( )   PDF (14481KB) ( )   Save We used lightweight UAV carrying mirrorless camera to shoot the canopy landscape of subtropical forest, and found that only 3 canopy species can be recognized at 100 m flight height, but almost 20 canopy species can be done at 50 m flight height by analyzing the canopy outlines, textures, structures and colors. Even some understory species can be distinguished. These results can provide much canopy species information and be useful for forest protection or ecosystem management. References | Related Articles | Metrics

Analysis on the Source Area of Forest Site in Phoenix Mountain of Zhuhai LIU Wei，WEI Zhigang，ZHENG Zhiyuan，ZHU Xian 2016, 36 (5):  840-849.  doi: 10.13284/j.cnki.rddl.002876 Abstract ( )   PDF (2497KB) ( )   Save Based on the data of CO2 flux and interaction between land and atmosphere from the observing tower in Phoenix Mountain of Zhuhai, the study computes the source area of corresponding time in evergreen broadleaved forest in the mountain, and analyzes the change rule with different atmospheric stability conditions, different seasons and different time using K-M model. We develop a series of standards, which can judge the uniform lever and certify the applicability of the K-M model by computing the ratio between the projected area and the surface area. The results show that the distribution of source areas is similar to that of the main wind direction in stable atmospheric condition, and not completely similar to the main wind direction distribution in unstable atmospheric condition. In winter, the source area is mainly distributed in the northern and eastern directions. In spring, before the onset of the monsoon, the source area distribution is similar to that in winter. After the onset of the monsoon, the distribution of the source area is relatively concentrated in the southwest and southeast directions. The rule is similar to that of the distribution of wind direction. As for daily variation, the area range at night is larger than that in the day. The maximum range more likely appears at night. With the monsoon onset, the time delays from T02:00 to 04:00. The cause is probably that the atmosphere in different seasons reaches the most stable condition in different time. The minimum range of the source area occurs in the period between T 07:00-09:00, when the turbulent activity is the strongest. References | Related Articles | Metrics

Analysis on Mangrove Resources Changes of Zhenhai Bay in Guangdong Based on Multi Source Remote Sensing Images 2016, 36 (5):  850-859.  doi: 10.13284/j.cnki.rddl.002874 Abstract ( )   PDF (6470KB) ( )   Save A large area of mangrove wetland has been preciously conserved in Zhenhai Bay of Jiangmen City, Guangdong Province. However, scholars and local government have not paid much attention to this area yet. In this paper, multi-source remote-sensing images of four periods (namely Declassified Intelligence Satellite image acquired in 1970, KH-9, SPOT-2 image obtained in 1999, ALOS multi-spectral image in 2007, and the ZY-3 image captured by domestic satellite in 2015) were used. Integration of spatial distribution characteristics of mangrove forest and objected-oriented multi-scale segmentation, visually interpreted approach were combined for accurate classification of mangrove forest. Results demonstrate that the areas of mangrove forest in Zhenhai Bay were 931.4, 615.3, 678.5 and 783.7 hm2 in 1970, 1999, 2007, and 2015 respectively, showing a declining trend in the former 10 years and later an upward tendency. Specifically, during the period from 1970 to 1999, the change of mangrove forest in this area was mainly due to the destruction of original forest, when only 5.7% of original forest was preserved. Later, during the period of 1999-2015, the interruption of people and artificial remediation coexisted, but on the whole the degree of the damage decreased. The area of mangrove forest increased 63.2 and 105.2 hm2 during 1999-2007 and 2007-2015, respectively. Hence, the primary driving factors that affect mangrove’s temporal and spatial change were the combined influences of the sprawl of aquaculture ponds and the artificial recovery of plants. Therefore, in this paper, we propose a series of measures for targeted protection and development of the mangrove wetland (e.g. protecting the suitable land, developing the ecotourism and realizing the dynamic monitoring on mangroves), so as to provide decision support for rational exploitation and better protection of mangrove forest resources in the area. References | Related Articles | Metrics

Application of Mixed Pixel Decomposition Method Using Dynamic Endmember Combination in Dynamic Monitoring of Vegetation Abundance: A Case Study of Changting County HE Yingqing，QIN Yan，FU Qinghua，LIU Chaoqun，YIN Bin 2016, 36 (5):  860-868.  doi: 10.13284/j.cnki.rddl.002885 Abstract ( )   PDF (16056KB) ( )   Save The combination of endmembers is fixed in the calculation of the abundance of endmembers using traditional pixel information decomposition method. However, this situation may change for a region with complex land use. In this paper, several endmember combinations are predetermined regarding the characteristics of land use of the study area. Endmember combination with minimum error, which is identified by using the least square method, is used to retrieve endmember abundance as well as vegetation abundance. Measured actual surface reflectance is adopted instead of endmember reflectance to avoid multi-temporal errors introduced by atmosphere differences and to benefit dynamic monitoring. Meanwhile, water and land are separated in advance, and only land endmembers are calculated. So the effect of water endmember is avoided and the simulation efficiency is improved. The validation with synchronized high-resolution images shows that the correlation coefficient is more than 90%. The model is applied to Landsat data acquired in Changting County in four different periods of recent 18 years. The results indicate an improving trend of the vegetation abundance in Changting County, especially in the bank regions of the Ting River. The declined vegetation abundance in parts of Changting County is mainly due to urbanization, slope burning, and massive constructions. References | Related Articles | Metrics

Spatiotemporal Variability of Monthly Evaporation and Correlation between Monthly Evaporation and Monthly Mean Temperature in Hunan Province CHEN Ajiao，HE Xinguang，CAO Siqin，ZHANG Xinping 2016, 36 (5):  869-877.  doi: 10.13284/j.cnki.rddl.002829 Abstract ( )   PDF (2655KB) ( )   Save The spatiotemporal distribution of monthly evaporation and the nonlinear interaction between monthly evaporation and monthly mean temperature in the period 1981-2013 in Hunan Province are analyzed by applying the empirical orthogonal function (EOF) and cross wavelet transform．The EOF decomposition of the monthly evaporation shows that the first three EOF modes can account for 77.9% of total variability．The EOF1 (63.4%) reveals that the main spatiotemporal distribution of monthly evaporation in Hunan province is the type of East-West contrary, which reflects that there exists a certain negative correlation between the monthly evaporation and elevation．The EOF2 (8.5%) is of a frequent positive and negative alternation in phase of the time coefficient, which reflects a more complex spatiotemporal change of the monthly evaporation．The value of EOF3(6.0%) shows a distribution as ‘+、-、+’．Then, the cross wavelet and wavelet coherence between monthly evaporation and monthly mean temperature are computed by respectively selecting Hongjiang, Sangzhi and Xinhuang as the representative station of the first three EOF modes． The results show that at the time scale of 8-16 months, the most significant correlation between monthly evaporation and monthly mean temperature occurs and all their phase angles are zero, which illustrates that the temperature strongly effects on the evaporation and there exists no lag effect at these time scales． But at the time scales of less than 8 months or more than 16 months, the occurrence rate and distribution of strong correlation and phase angles are obviously different along time axis． References | Related Articles | Metrics

Water Quality Fluctuations in Coastal Shallow Groundwater under Tidal Influence LU Jianfei，GAN Huayang，PANG Yuan 2016, 36 (5):  878-886.  doi: 10.13284/j.cnki.rddl.002882 Abstract ( )   PDF (959KB) ( )   Save Based on hourly sampling data in coastal shallow groundwater at eastern part of Leizhou Peninsula, water quality fluctuations under tidal influence are analyzed. The results prove that: 1) Na+ and Cl- are the chief ions in the groundwater of the research zone, while K+ and CO3 2- are ignorable. Groundwater quality in Donghai Island is stabilized, and no obvious correlations can be found among ions in the water. Quasi-synchronization variations of ions in the groundwater do exist in Nandu River basin and Xinliao Island. 2) The damage of alkalization of groundwater to soil in Nandu River area is the lowest, while that in Xinliao Island the highest, especially during spring tide. Changes of alkalization degree in Donghai Island are within very limited boundaries that are barely affected by tidal power. On the contrary, higher alkalization damage comes about during spring tide in both Nandu River area and Xinliao Island, derived from stronger seawater intrusion caused by strengthened tidal power, which aggravates the damage of alkalization of groundwater to soil. 3) As for the intensity of seawater intrusion to the groundwater, Donghai Island suffers the worst hit on average regardless of tidal power, which indicates an ordinary phenomenon. The maximal intensity during spring tide in Xinliao Island is higher than that in Donghai Island, while mean damage in Xinliao Island is lower than that in Donghai Island. Intensity of seawater intrusion is the lowest in Nandu River area and even down to zero at some time. 4) Na+ and Cl- in the groundwater of each monitoring well are closely correlated and are the major constituents in TDS, which also lead to main changes in TDS. TDS fluctuation is the most obvious in Nandu River area, and then in Xinliao Island. TDS in Donghai Island barely changes. 5) Conductivity monitoring in groundwater can be a way to monitor mineralization of water, as well as Na+ and Cl- in Nandu River and Xinliao Island, while interval instead of precise monitoring can be carried out for Donghai Island. References | Related Articles | Metrics

Characteristics of Regional Wind Environment and Construction of Ventilation Corridors: A Case Study of the Pearl River Delta REN Qingchang，WEI Jiming，DAI Wei 2016, 36 (5):  887-894.  doi: 10.13284/j.cnki.rddl.002886 Abstract ( )   PDF (71643KB) ( )   Save Ventilation is an important measure of urban low-carbon ecological construction. This research is based on the domestic and abroad research of urban planning and Climatology. Using simulation technology to analyze the ventilation on regional scale, identifying the potential areas of ventilation and construction recommendation, the research shows that: 1) The simulation of WRF meso-scale forecast model system has a good analysis effect, which can reflect the characteristics of wind environment in the Pearl River Delta; 2) Analyzing the ventilation potential of different types of underlying surface, the research identifies the North River of Foshan, the Liuxihe River of Conghua, the areas of Yangcun and Botang in northern Huizhou, Baipenzhu Reservoir of Huizhou as the winter wind inlet, while the Lingding Bay, the coastal area of Doumen in Zhuhai and the Daya Bay area in Huizhou as the summer wind inlet; 3) The research also identifies that the downwind areas of the towns, villages, rivers and mountains in the Pearl River Delta can be taken as the regional ventilation potential area; 4) With regional united prevention, comprehensive utilization of space and integrated design, the research raises some suggestions about implementation of ventilation corridor construction. References | Related Articles | Metrics