运用频率计算河川基流量方法研究

Study on Frequency Calculation Method for River Baseflow

河川基流量是水文水利分析计算、水资源评价、洪水分析、地下水径流特性分析中的重要内容。国内外河川基流量分割方法很多，不同方法的分割结果也不尽相同。通过对甘肃黄河流域洮河水系4个水文站，长江流域白龙江水系2个水文站、内陆河流域黑河水系3个水文站共计9站的1980～2000年20a的实测资料运用滤波算法对基流进行切割，根据年径流量运用PⅢ型曲线查出频率，再根据频率与基流建立模型，得到河川基流量计算的简便实用方法，提高山丘区地下水资源量评价的效率，细化水资源评价结果，便于推广使用。

As river baseflow is a key factor for water resource assessment, flood analysis, underground runoff characteris- tic analysis and hydrology analysis, foreign and domestic experts have put forward many methods on river baseflow division, which get various results. By analyzing data of 4 hydrological stations along Yellow River in Gansu, 2 hydrological stations a- long Yangtze River and 3 Hydrological stations along Hei River from 1980 to 2000, the paper divides baseflow with filtering al- gorithm and identifies frequency by corresponding annual runoff and PⅢ curve. Finally, the paper successfully builds and model by synthesizing frequency and baseflow division. The simple and practical calculation method is conducive to improve accuracy of water resource assessment of groundwater in hilly regions and is worth being generalized.