黄河上游班多一级水库水流水质预测研究

Prediction on Water Flow and Water Quality of Banduo Ⅰ Reservoir in Upper Reaches of Yellow River

针对河道型水库地区有关参量的垂向变化比横向变化大的特点,建立垂向二维水流数学模型,采用算子分裂法、交错网格法、有限差分法求解。以50%频率年为例,在拟定发电洞引水流量和泄洪洞泄流量的基础上,模拟了黄河上游班多一级水电站的非恒定流动,结果是合理的。建立了一维动态水质模型,采用preissmann四点偏心隐格式求解,模拟了班多一级库区的BOD和氨氮浓度的时空分布。预测结果对于环境保护和工程的建设及运行有重要意义。

Vertical 2-D hydraulic model was developed for reservoirs which variation of related parameters change greater in vertical direction than in horizontal direction, coordinate transformation in vertical direction was made in order to change from irregular domain to regular domain. Operater-splitting, staggered grid and finite difference method were used. Taking 50% of hydrologic frequency as an example, on the basis of the discharge of power tunnel and spillway tunnel, the model was used to simulate the unsteady flow of Banduo Ⅰ hydropower station and the resuits are reasonable. One dimensional dynamic water quality model was developed and solved by the Preissmann four-point off-centre implicit format. The time and space distribution of BOD and NH3-N in the reservoir was predicted. The prediction results are of great significance of environ ment protection and construction, operation for the project.