小流域非点源污染负荷流失特征监测研究——以广东省珠海正坑小流域为例

以GIS为技术支持,完成了以元胞自动机(CA)为模型的基于土地利用变化的土壤侵蚀空间演化分析。通过对土地利用规划前和规划后不同利用模式制约下侵蚀发展状况的模拟,预测了不同利用模式中各地块单元土壤侵蚀的发展方向,为评价土地利用合理程度提供了理论依据。

Spatial Evolution Imitation of Soil Erosion Influenced by Land-using Pattern

In the course of whole precipitation-runoff,the concentration of the non-point source pollutants in runoff changes are monitored and studied.The results are as follows:the concentration of every pollutant is high in early stage of producing flow,then tends to decline.For the soluble pollutant,the concentration ranges small,like milder wavilness in the course of whole precipitation-runoff.As for difficult dissolving pollutant,particularly for total phosphorus,the concentration in the course of whole changes acutaly like zigzag.This indicates that there is certain confinement to the concentration scope dissolved and achieved for dissolve component under a certain water environment condition.Its dissolving characteristics are influenced obviously possibly by the water environment condition than by the flow rate change.