鄱阳湖流域1955-2002年径流系数变化趋势及其与气候因子的关系

近些年来,由于人类活动的影响,湖泊普遍出现了萎缩、水位下降、水量锐减、水质污染等问题,研究湖泊最低生态水位,确保湖泊所必须的最小水量,对于解决我国湖泊生态退化问题具有重要意义.本文提出综合指标法来计算湖泊最低生态水位.根据博斯腾湖具体情况选取天然水位资料、湖泊形态和芦苇3种指标为依据分别计算博斯腾湖的最低生态水位,计算结果分别为1047.06 m,1047.41 m和1047.20 m,然后通过综合分析以上这3种指标所占权重,进行加权计算,最终确定博斯腾湖最低生态水位为1047.16 m,通过分析表明1047.16 m作为博斯腾湖最低生态水位是合理的,综合指标法作为湖泊最低生态水位的计算方法切实可行.

Runoff coefficients change and the analysis of the relationship between climate factors and runoff coefficients in Poyang Lake Basin (China):1955-2002

This paper put forward the composite index method to calculate the lowest ecological water level and se- lect 3index,that is natural water level date,the lake morphology,reed to calculate the lowest ecological level accord- ing to the circs of Lake Bosten.The result are 1047.06m,1047.41m,1047.20m,respectively.According to every factor contribution to the lowest ecological level,the weighting coefficient of every factor was considered.The final result show that the only when the water level is high than 1047.16m can the ecosystem structure be guaranteed, and the normal ecosytem function be fully played,the bio-diversity and the ecosystem integrity be maintained. Therefore,it is reasonable that the 1047.16m as the lowest ecological water level.