中文摘要：

高含沙河流汛期难控制利用洪水量评价是水文水资源领域的重要课题，目前对其内涵、评价方法及其性质等认识仍很有限。以泾河巴家嘴水库为例，针对水库防洪调度性能和流域水资源利用沙限特征，从水量和水质角度把汛期难控制利用洪水量划分为汛期难调控洪水量和汛期难利用洪水量，分别采用水库防洪优化调度模型和分级最大值法进行求解。结果表明：本研究结果可信；汛期难调控洪水量与入库场次洪水关系密切，1988年汛期共发生4次难调控洪水量，总量为456．41万m3；基于防洪优化调度结果及其径流泥沙含量，确定汛期洪水弃水系数，获得汛期难利用洪水量10380．17万m3，故汛期难控制利用洪水量为10836．58万m3，为洪水资源的开发利用和洪水灾害风险研究提供新的思路。

英文摘要：

Evaluation on the hard-regulated and utilized volume of floodwater （HCUVF） in flood season for hyper-concentmtion rivers is a key issue in hydrology and water resources, but at precent the understandings of its connotations and properties and the existing evaluation methods are very limited. This work takes a case study of the Bajiazui reservoir on Jinghe River. With consideration of the operation of reservoir flood control and the sediment transport limitation on utilization of watershed water resources, and in view of water quantity and quality, HCUVF is divided into two portions, a hard-regulated volume and a hard-utilized volume. The two portions are calculated with an optimal operation model of reservoir flood control and a maximum grade approach, respectively. Results show that the hard-regulated volume much depends on the inflow flood events of reservoir. In the flood season of 1988, four such events occurred with a total volume of 4.56 million cubic meters （mcm）. For the second portion, the coefficients of surplus floodwater in flood season can be determined by using the optimization results of reservoir operation and the corresponding sediment concentrations in the river flow, and its volume of 103.80 mcm was estimated. Summing up the two figures gives a total HCUVF of 108.36 mcm for the flood season of 1988. Thus, the presented method is reliable and provides an insight into development and utilization of floodwater resources and study of flood disaster risk.