黄河供水型水库库容计算方法研究OA

Water-supply reservoirs,as important infrastructure that supports both industrial water supply and domestic water supply,are characterized by frequent fluctuations in water level;consequently,it is necessary to establish an accurate relationship between water level and storage capacity in order to realize refined scheduling,to further clarify the applicability of different calculation methods in the measurement of storage capacity for water-supply reservoirs,and to achieve effective management of such reservoirs as well.Taking the Zhaobishan Reservoir,which withdraws water from the Shapotou North Main Canal in the upper reaches of the Yellow River,as the example,this study obtains above-water and underwater topographic data through the combined use of low-altitude UAV aerial photogrammetry and an unmanned surface vessel-mounted echo sounder.The ArcMap module within ArcGIS software is used to realize spatial integration of both the above-water terrain data and the underwater reservoir-bed elevation data,thereby generating a high-precision digital elevation model(DEM)that fully covers the entire reservoir area.Three methods,namely the DEM method,the contour volume method(CVM),and the cross-section method(CSM),are applied to calculate the reservoir storage capacity under different water-level conditions and plot storage capacity curves.For the storage capacities computed by the above three methods for partitioned segments between the dead water level and the check flood level of the Zhaobishan Reservoir,verification and rechecking are carried out with South CASS software.The results of the study indicate that CVM attains the highest accuracy together with the best stability across the full water-level range,remaining stably within 0.21％to 0.23％at the key levels of normal storage level 1 311.20 m,design flood level 1 311.60 m,and check flood level 1 312.00 m,and in particular it is therefore recommended as the preferred method for the calculation of storage capacity in water-supply reservoirs.The DEM method performs well within the high water-level range,achieving relative error levels between 0.05％and 1.78％and thus serving as an alternative method under specific water-level conditions.The CSM exhibits relative errors between 3.54％and 12.89％across the full water-level range and is not suitable for the storage-capacity calculation of water-supply reservoirs.Finally,on the basis of calculation data derived from CVM,a shifted power function water level-water surface area relationship model and a cubic polynomial water level-storage capacity relationship model are established,thereby achieving the transformation from discrete data to continuous functional representations.The technical workflow constructed in this study,consisting of the sequential steps of data acquisition,method comparison,error evaluation,and model establishment,provides a reliable basis for refined calculation of reservoir storage capacity and reservoir scheduling of water-supply reservoirs.