基于GIS技术的生态需水量化研究

Quantitative research of ecological water demand based on GIS

由于区域生态环境问题的差异,目前生态需水研究在概念和计算方法上都存在一定的差别.在界定生态需水的概念及内涵后,阐述了生态需水量化方法,其中河道外生态需水计算过程与GIS技术相结合.在对研究区域进行生态分区的基础上,通过RS技术、GIS技术生成数字土地利用图,提取计算所需的土地利用资料,使得计算在精度和效率上有了新的突破.最后,在石羊河流域进行实例应用分析,对本文的理论方法进行验证.

Because of the diversities of district ecology and envtronment problems, mere are some differences in the current researches of ecological water demand on the concept and calculation method. In this article, the concept and connotation of ecological water demand are defined, and the quantitative method, in which the calculation of ecological water demand in out-riverway and GIS are combined together, is introduced. Based on the ecological division to the research district, the necessary field utilization data are obtained by the field utilization figure made by RS and GIS. And it makes a new break through for the calculation accuracy and efficiency. In the end, the above methods are validated by the applications to Shiyang River basin.