TROPICAL GEOGRAPHY ›› 1997, Vol. 17 ›› Issue (3): 295-302.

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THE LAWS OF HYDROLOGIC VARIATION IN THE XIANGJIANG RIVER VALLEY

Li Jingbao, Wu Guisheng, Liu Xiaoqing   

  1. Department of Resources and Environment, Hunan Nornd University, Changsha 410081
  • Received:1996-04-01

Abstract:

From the analysis of meteorological and hydrologic data measured at the main hydrologic stations in the Xiangjiang Rive valley from 1951 to 1994,the hydrological laws are concluded as follows.1) The temporal and spatial distribution of runoff depth coincides with that of rainfall,the peak of flow curve is very steep,and the fluctuation of water level reaches 11.00-22.50m.2) Flood peak flow in trunk stream increases rapidly from the upper reaches to the lower reaches and complex peaks often appear at the upper reaches.3) The flood peak flow lasts increasingly longer from the upper reaches to the lower reaches while the fluctuation range of its propagation speed has a tendency towards growing larger.4) The temporal and spatial variation of the silt content is steady with an average of 0.172 kg/m3.5) The chemical type of water is double carbonate,with its variation between C1 and or between and,and the change of its content coincides basically with that of the runoff and the content of silt.

Key words: Xiangjiang River Valley, Runoff, Flood, Hydrologic law