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1·The hydrological year was determined by long series rainfall data and the hydrological regime was predicated by considering time series method.

通过长系列的降雨资料确定了水文年，通过考虑时间序列预测了未来一段时期的水文状况。

2·The hydrological regime change law is proposed by the analysis of discharge-stage relations of main hydrologic stations in Dongting Lake area in this paper.

通过对湖区主要水文控制站的水位流量关系的分析，得到了近四十年来水情变化的一些规律， 供有关部门参考。

3·Understanding the characteristics of the project, such as backwater curve, change of hydraulic and hydrological regime (such as change of discharge and silt distribution).

粒径和沉速的频率分布特性对于描述泥沙都是必需的。