漓江桂林市区段水环境自净容量地理信息模型探讨

在较复杂的河流上建立水环境容量模型，用数理方程的方法是不考虑地理的复杂性，用数理统计的方法是不分析成因的，地理信息模型是地理复杂方程，又是地理现象必然性与偶然性相结合的模型．通过分析水环境容量的组成及机理，研究了复杂的岩溶山区河流——漓江在桂林市区段的水环境自净容量，探讨了地理信息建模方法在水环境自净容量计算方面的实例应用，建立了漓江桂林市区段水环境自净容量的地理信息模型，并对其进行了验证．结果表明：地理信息模型方法在计算较复杂河段水环境自净容量时，即是一种较简便的计算方法，又能取得较理想的计算结果．

Water Environment Self-Purification Capacity Geography Information Model (GIM) in Guilin Section of Lijiang River

In establishing a water environment capacity model in a complex river, the method of mathematical analysis does not take the complexity of geography into account and the method of mathematical statistics does not deal with the cause of formation. GIM is the best method to analyze the complex geography and is a model that combines the inevitability with the chanciness of the geography phenomena. In this paper, by analyzing the constitution and mechanism of water capacity, the water environmental self-purification capacity of Guilin section of Lijiang River, a complex mountain karst area is studied, and a method of GIM model used in calculating the water environmental self-purification capacity is established. The result shows that the GIM method is a simple calculating method and can get a perfect result in calculating the water environmental self-purification capacity in a complex section of a river.