伊塞克湖近期变化及其原因

THE RECENT CHANGE OF WATER LEVEL OF YISEKE LAKE AND ITS CAUSE

本文分析气象因素变化及人类活动对伊塞克湖的影响,认为近百年来湖水位出现趋势性下降主要是人类活动和湖泊形态特征所致。

The water level of Yiseke Lake has been tending to descend during the last half century and more, its descending speed has reached 5.0 cm per year. This is mainly caused by the human activities.Duringg the recent several decades, with the increasing of water consumption of agriculture, industry and daily life in the drainage area of Yiseke Lake, the water storagge of the lake has been decreasing as a averagge rate of 6.00×10~8m^3 per year.As Yiseke Lake is very deep (its maximum depth reaches 668m, the average depth is 278m) and the lake shore is very precipitous, the decrease of the water storage has caused the considerable descent of the water level of Yiseke Lake, the changge of the water surface area of the lake has been small comparatively. According to the calculated results of the water balance, the most important factor which influences the water level of Yiseke Lake is the human activities. The decrease of the lake's water storage or the descent of the water stage of it will last for a long time, the deescendingg range of the water level will be very large.