天山北麓前山带对平原区水文过程的影响

借助地理信息系统与遥感图像处理技术,分析了天山北麓前山带对平原区水文过程的影响,结果表明:阻碍地下水的流动使其转化为地表水从而增加了河川径流流量;增大了河川径流的年调节能力,使绿洲可以稳定地发展;阻止山区洪水与泥石流对绿洲的危害;影响到山前潜水埋藏深度、潜水溢出带分布与溢出量变化。对山区生态环境有一定的保护作用;对土地利用和土地覆被变化有重要的影响

Effect of foothill belt on hydro-process of plain area in the northern slope of Tianshan Mountains

The Foothill Belt in the northern slope of the Tianshan Mountains is a transitional znoebetween mountains and plains.It is about 400 km long and 60 km broad from Wusu city to Jimusar city, appearing in three rows of folds with different morphologies and with their age becoming younger from south to north. Based on Geological Information System (GIS) and Remote Sensing (RS) methods, as well as previous research results, this paper systematically discusses the effects of foothill belt on hydro process in plain area. There are four facets of effects. Firstly, the foothill belt can prevent shallowgroundwater from flowing into plains directly, and turn it into surface water flow so as to increasestream runoff. The percentage of groundwater to surface river flow with foothill belt can reach about 47%, but percentage of groundwater to that without foothill belt is only about 37%. Secondly, the foothill belt can enhance annual adjustment abilityof surface rivers, making oasis developsteadily, e.g. the oasis area is about 7 539km 2 in ManasRiver basin with foothill belt is available, but in Sikeshu River basin, the foothill belt oasis area is only about 134km 2 . Thirdly, the foothill belt can prevent floodwateror mud rock flow from entering into plains directly and protect oasis safety. Fourthly,the foothill belt can affect distributions of aquifer'soverflow and buried depth of groundwater level in the plain area,and can control spill amount of groundwater. The foothill beltis importantto surrounding environment, as it can protect the surrounding ecoenvironment, influence land use and land cover change in the plains. Every vertical spectrum with foothill belt is100～200m lower than that without foothill belt. The purpose of this paper is to affer anew understanding about the foothill belt andits functions to environment, especially to hydro process in the plains, and a new idea about how to study interaction between highland and lowlandor mountains and plains. And it can provide scientific basis for utilizing water resources rationally and achievingsustainable development of oasis.