莫索湾灌区1998—2007年地下水埋深变化及影响因素

依据玛纳斯河中游莫索湾灌区1998—2007年(共120个月)的地下水位监测资料,分析地下水埋深年际变化情况,采用主成分分析法对灌区地下水埋深变化的影响因素进行分析.结果表明:地下水埋深年际变化持续或波动下降;灌水量和抽水量是影响地下水埋深的主要因子,其荷载分别为0.801和0.769,埋深随灌水量的减少、抽水量的增加而增大;蒸发量仅次于灌水量和抽水量,也是影响地下水埋深的重要因子;而降雨量对地下水埋深没有显著的影响,其贡献率只有15%.分析了主要影响因素与地下水埋深变化动态的关系,认为灌区地下水埋深在自然因素和人为活动的交互影响下年内季节变化明显.

Change of groundwater depth and impact factors in Mosuowan Irrigation District during 1998 -2007

Based on the groundwater level data of Mosuowan Irrigation District of the middle Reaches of Manas River during 1998—2007(120 months),annual change of groundwater depth is analyzed.According to the groundwater depth and its impact factors in different years,the impact laws and their degrees of different factors affecting the groundwater depth are investigated with principal component analysis.The results show that the annual change of groundwater depth is degressive persistently or wavily.Irrigation water quantity and pumping rate are the most important impact factors of groundwater depth,their load is 0.801 and 0.769.Groundwater depth sinks deeper with decreasing irrigation water quantity and increasing pumping rate.Evaporation is the third important factor,recharges groundwater depth.But there is no significant correlation between rainfall and groundwater depth;its contribution rate is 15%.Correlation between the most impact factor and dynamic change of groundwater depth is analyzed;it is shown that the seasonal change of groundwater depth is obvious under influences of natural factors and factitious factors in Mosuowan Irrigation District.