新疆玛河安集海灌区给水度变化规律及试验研究

在对新疆玛纳斯河流域安集海灌区进行地表水地下水转换机理和联合调度研究及利用各类集总式、分布式水文模型进行地下水数值模拟时，给水度都是一个十分重要的输入参数。分析研究区的基本地质情况，选取比较有代表性的地块，利用给水度参数测定装置分别测定常值给水度、变值给水度，揭示该区域给水度随地下水埋深的变化规律。试验得出：在计算地下水降雨入渗补给量和灌溉入渗补给量时要用到给水度这一参数，特别是在地下水埋深不大的地区，对计算成果有比较明显的影响；在地表排水沟设计中，如果考虑了给水度随埋深而变的情况，排水沟的尺寸就会发生变化。

Experimental Study on Variation of Specific Yield in Irrigation Area of Anjihai in Xinjiang

As specific yield is a very important input parameter for research on mechanism of transformation from surface water to groundwater and numerical simulation for groundwater, the paper measures the specific yield of 8 presentative soil samples by u-sing its own specific yield measurement set. Among the 8 samples, 5 are used to measure literal specific yield, while other 3 are used for variate specific yield measurement. The research, which is different from the traditional research approach in this field, is not only an scientific improvement, but also an advance in practical application. In field operation, specific yield will affect the re-charge of rainfall and irrigation for groundwater, especially for which buried shallow. Moreover, the size of drainage ditch on the surface of ground varies according to the depth of groundwater.