中文摘要：

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。

英文摘要：

By using SWAT model,the runoff and sediment process of the Yixun River basin under the land use conditions of1985 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 account.