伊逊河流域土地不同利用方式的水文效应模拟

利用SWAT模型对伊逊河流域水文效应进行分布式模拟,分别模拟了1985年和2010年两期土地利用条件下、3种不同土地利用模式下流域的产流产沙过程。选取径流年内分配不均匀系数、涵养指数和泥沙年内分配不均匀系数,对不同土地利用模式下的水文效应进行对比分析。研究表明,生态保护型模式有利于减少泥沙流失、增加水土涵养能力;城市扩张型模式虽有助于减少产沙量,却使径流大大增加,不利于城市防洪安全;耕地保护型模式有利于水源涵养,却使输沙量增加。在城市发展过程中,应充分考虑水文效应与经济效益。

Simulation of hydrological effects under changes of land-use patterns in Yixun River watershed

By using SWAT model , the runoff and sediment process of the Yixun River basin under the land use conditions of 1985 and 2010 and 3 land use patterns were simulated .Three indicators , the annual uneven distribution coefficient of runoff , conservation index and the annual uneven distribution coefficient of sediment , were selected to analyze the hydrological effects for different land-use patterns .The result shows that the ecological protection pattern can reduce sediment loss and increase soil and water conservation capacity;the urban expansion pattern would reduce the sediment yield , resulting in significant increase in runoff and is not conducive to urban safety;the farmland protection pattern is favorable for the water conservation , but results in sediment increase .In the process of urban development , the hydrological effects and economic benefits should be taken into ac-count.