Tropical Geography ›› 2020, Vol. 40 ›› Issue (6): 1094-1108.doi: 10.13284/j.cnki.rddl.003284

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Comprehensive Assessment and Deep Spatial Management of Coastal Zone in Lingao County, Hainan Province from Multiple Viewpoints

Penghua Qiu1(), Na Du1(), Bingbing Liu2, Xing Yang1, Genzong Xie1, Zunqian Zhong1   

  1. 1.College of geography and Environmental Sciences, Hainan Normal University, Haikou 571158, China
    2.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • Received:2019-08-15 Revised:2020-08-26 Online:2020-11-30 Published:2020-12-10
  • Contact: Na Du E-mail:cphscnu@163.com;673355216@qq.com

Abstract:

Sensitivity and risk assessments are not only effective methods for disaster prevention and alleviation but are also important bases for scientific spatial planning and regional environmental policy-formulation. To further strengthen the integrated management of coastal zone and explore more efficient methods of ecological space control, ten factors, namely soil erosion, desertification, soil salinization, typhoon disaster, rainstorm and flood disaster, special habitat, storm surge, disastrous wave, coastal erosion, and red tide, were selected to evaluate the eco-environmental sensitivity of the coastal zone in Lingao County, Hainan Province. Earthquake, collapse, landslide, land subsidence, and sand liquefaction were considered in the risk assessment of geological hazards. The results derived from eco-environmental sensitivity and risk assessment of geological hazards were combined with territorial planning to analyze the deep spatial management zoning of the study area. The results indicated that: 1) Desertification, soil salinization, rainstorm and flood disaster, red tide, and coastal erosion were mainly slightly sensitive; soil erosion and typhoon disaster were mainly moderately sensitive; and special habitat, storm surge, and disastrous wave were highly sensitive. The area of moderate, high, and extreme-high comprehensive sensitivity zone was 9 682.11, 3 275.29, and 983.88 hm2, respectively. Among them, Diaolou Town had the largest distribution area in the highly sensitive zone, and Bohou Town had the most widely distributed area in the extreme-highly sensitive zone. 2) The main geological hazards were earthquake, collapse, landslide, land subsidence, and sand liquefaction. Except for the seismic risk, which was divided into high-risk zone and middle zone, the other four types only had medium-risk and low-risk zones. The comprehensive risk zones were classified as high, medium, and low, among which the risk areas were mainly distributed in the 15 m area on each side of the fault zone of Bohou, Dongying, Bolian, and Huangtong Town, with a total area of 118.86 hm2. 3) The development and utilization of the coastal zone in Lingao County may be divided into three levels. The first level includes specific protected zone, moderate development zone, and intensive development zone. The second level included eight zones, including natural reserves, retention zone, utilization zone in control, agricultural development zone, tourism and leisure zone, public facility zone, residential construction zone, and industrial zone. The third level consisted of 18 tertiary divisions. 4) The deep spatial management zoning of the coastal zone with multiple horizons of ecological sensitivity, geological hazard risk, and territorial planning can better identify important protection objects and key protection areas and enable the coastal zone to be fully developed and utilized. Although this paper attempted to diagnose and identify the intensity and spatial distribution of various eco-environmental sensitivity types in the coastal zone from the views of quantification and visualization, some problems need to be explored further in the process of application, such as index selection, model construction, data acquisition, synergistic influence among different ecological environment sensitivity types, and so on. Moreover, the visual expression of geological hazard formation mechanism in the coastal zone and the commonness and individuality of the quantitative measurement of potential geological hazard risk assessment are also aspects that need to be strengthened.

Key words: coastal zone, eco-environmental sensitivity, geological hazard risk, spatial management, Lingao County, Hainan Province

CLC Number: 

  • X321