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中文摘要：
黄河无定河流域是典型的黄土高原沟壑地区，水文时空变化大，观测站点有限，水文过程的非线性问题和人类活动影响问题比较突出．本文针对黄河无定河流域内不同尺度水文循环模拟问题，对作者开发的分布式时变增益水文模型进行了改进，拓展到了月、日、时三个时间尺度，应用于无定河内的大理河、小理河及岔巴沟三级不同空间尺度的流域．研究表明：分布式时变增益水文模型是水文系统非线性理论与分布式流域水文模拟结合的一种新途径，水文系统模拟的精度比较满意．该模型为分析土壤湿度的时空分布与变化以及人类活动的影响，提供了一种量化分析的有效工具．
英文摘要：
In view of the loess plateau features of basin, modified the Distributed Time-Variant Gain Hydrological Modelical （DTVGM）, and expanded the model to month, daily and real time scales. The DTVGM, coupling the advantages of both nonlinear and distributed hydrological models, can simulate variant hydrological processes under different environment conditions. Then,three models are applied to three catchments, which are Dali River, Xiaoli River, and Chabagou catchments. The three catchments area is different; there are different spatial scales. The result of simulation is very good. Last, the model can be used to analyze the temporal and spatial change of hydro-cycle and human activity effect. Satisfactory results were obtained in forecasting the time-space variations of hydrological processes and the relationships between land use/cover change and surface runoff variation.
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