The Coupling Coordination Degree Study of Settlement and Land and Water Resources Based on Irrigation District—A Case Study of Zhangye Oasis
Abstract: Multiple subsystems are interdependent as well as independent, forming a mutually complemen-tary relationship, which has a coupling relationship. The coordination is a measure of the degree of harmony between the degree of system or internal elements in the development process, which embodies the system from disorder to order trends. In modern oasis, within the human-water-soil system composed of human being, water and soil resources, there exist close relations and inte-ractions among the system’s elements. Based on the data of human-water-soil system in Zhangye irrigation districts, as well as the second land survey database of Zhangye city, we constructed human-water-soil comprehensive evaluation function, and then used the model of coupled degree and coupled coordination degree to calculate each degree of human-water-soil system in Zhangye irrigation. The result showed that: in 29 irrigation units of Zhangye oasis, coupling degree can be divided into four categories. The average of coupling degree about human and water, soil resource is 0.714 for the high level of coupling stage, but the distribution of coupling degree is significantly different. Region in highly coupling degree is mainly distributed in some typical core areas of the oasis and is almost distributed along the Heihe River; region in the run stage is mainly distributed in the hillside irrigation or edge of oasis irrigation and relies on large tributaries. Water has a certain level of assurance. Irrigation in antagonistic stage is mainly located in the territory of Zhangye Heihe River downstream outlying areas; low coupling region is distributed in the more independent Sunan irrigation region. The spatial distribution characteristics about human-water- soil system of the degree of coordination and coupling are essentially similar, but slightly different in Zhangye irrigation unit. The degree of coordination falls into four general categories: extremely coordinated, highly coordinated, moderately coordinated and low coordinated. Extreme coordi-nated irrigation districts are mainly distributed along the Heihe River mainstream. Those irrigation districts are typical oasis-irrigated farmlands. High coordinated irrigation districts are distributed in the edge of the oasis irrigation districts and partial hillside irrigation districts; moderate coordinated irrigation districts are mainly distributed around the high coordination areas, including Laojunhe, Mayinghe, Shahe and Suyoukou irrigation districts which rely on the substan-tive river. Low coordinated irrigation districts are typical independent irrigation districts in Sunan. Accordingly, the 25 irrigation districts of Zhangye can be divided into four types: the hu-man-water-soil harmonious areas, namely high coupling and high coordination areas; hu-man-water-soil run-in areas, namely high coupling and low harmonious areas; human-water-soil antagonistic areas, namely middle coupling and low harmonious areas and human-water-soil low coupling areas, namely low coupling and low harmonious areas.
文章引用: 王录仓 , 高 静 , 武荣伟 (2015) 基于灌区尺度聚落与水土资源耦合协调度研究—以张掖绿洲为例。 水土保持， 3， 55-64. doi: 10.12677/OJSWC.2015.34008
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