气候变化对祖厉河流域水文环境的影响

Influence of Climate Change on Hydrologic Environment in Zulihe River Basin

根据水文站实测资料序列,对半干旱区典型代表流域祖厉河流域水文要素随气候响应变化特征进行分析。分析表明:20世纪70年代以来,伴随流域气温不断升高,流域水文循环条件的改变,导致祖厉河流域水文特征发生变化。流域水温同气温变化趋势一致,呈显著上升趋势。而流域年降水量,年径流则呈现出逐年递减趋势,且水质特征恶化明显。以流域气温20世纪90年代后显著升温期为分界点计算径流量多年平均值变化表明:90年代以后流域多年平均径流量比90年代以前减少了20.6﹪。

According to the observed data series,an analysis was made on the hydrological characteristics under the influence of the climate change the Zulihe River Basin.The results indicate that the rising of the watershed temperature and change of the hydrological environment have led a change of hydrological characteristics in the Zulihe River Basin since the 1970s.The water temperature has the same change tendency with the air temperature,showing an increase trend.However,the annual precipitation and annual runoff present a decrease tendency,with the water quality getting worse.Comparing with the annual mean runoff,it decreased by 20.6%.