基于GIS的凉州灌区节水效率分区研究

以甘肃省凉州区的灌区耕地作为评价对象，应用 GIS 数据处理和空间分析功能，借助县域耕地资源管理信息系统软件，结合层次分析法和模糊数学法，对灌区节水效率进行了适宜性评价；并通过计算评价指数，按照累积曲线法确定了凉州区灌区节水效率分级方案。结果表明，高效节水区 IFI综合值为0.700036~0.922291，潜能节水区IFI综合值为0.627345~0.699466。通过系统计算，影响节水效率的指标因子的权重大小依次为灌溉保证率、坡度、灌溉模数、有机质、障碍层厚度、有效磷、熟化层厚度、耕层厚度。整个灌区高效节水区面积略大于潜能节水区面积。在灌区行政层面上，高效节水区面积较大的是西营灌区、永昌灌区、杂木灌区，潜能节水区域面积较大的是黄羊灌区。同时定量划分了灌区不同节水效率分区面积，生成了凉州区灌区耕地节水效率适宜性分区图。

Study on Demarcation of Water Saving Efficiency of Liangzhou Irrigation Area Based on GIS

In this paper,liangzhou district irrigation farmland in gansu province as the object,the application of GIS data processing and spatial analysis function,with the help of county cultivated land resources management information system software, combined with analytic hierarchy process and fuzzy mathematics method and then the suitability evaluation on the water-saving efficiency;according to the cumulative curve method to determine the liangzhou district of water-saving efficiency classification scheme by calculating the evaluation index . The results showed that IFI comprehensive value of high efficiency water saving area were 0.700 036~0.922 291,IFI comprehensive value of potential water-saving area were 0.627 345~0.699 466 . Through calculation of the system the weights of index factor was of influence order of water-saving efficiency,and was in the order as irrigation reliability, slope, irrigation modulus, organic matter, barrier layer thickness, effective phosphorus, slaking layer thickness, thickness of top layer . The efficient water-saving irrigation area is slightly larger than the potential water conservation area,the administrative level in the irrigation area,larger area of efficient water conservation area was Xiying irrigation area,Yongchang irrigation area,Zamu irrigation area,larger regional area,potential of water saving was Huangyang irrigation area . Meawhile, quantitative division opened the efficiency of the different water-saving irrigation area and the suitability zoning maps water-saving efficiency of Liangzhou district irrigation farmland .