摘要
研究基于数字高程模型数据,根据影响空间水资源获取的要素,建立像元尺度上水可获取性的评价模型。选取广西西江流域进行实证研究,首先在水文模型的基础上,提取流域的自然水系并进行验证;其次,获取模型的坡度、高差、径流量和取水距离等主要参数;最后,根据水资源可获取性模型,评价流域内任意点的水可获取性难易程度。通过水文模型提取的自然水系与流域实际水系基本吻合;研究水资源可获取性为0. 092 0~3. 961 1,从西北到东南表现为递增的趋势。
Based on the data of digital elevation model and the factors affecting water spatial accessibility, a water accessibility model on pixel scale is developed. The Xijiang River Basin in Guangxi is selected as study case. Firstly, the natural water system of basin is extracted and verified based on hydrological model. Secondly, the main parameters of model are obtained,including slope gradient, altitude, runoff and water withdrawal distance. Finally, the accessibility of water at any point within basin is evaluated according to water accessibility model. The results show that the natural water system extracted based on hydrological model is basically consistent with actual water system, and the accessibility index of water resources is 0. 0920-3. 9611 which appears an increasing trend from northwest to southeast.
引文
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