Abstract: Through the actual reconnaissance of the reservoir of Shibanzhai in the Beipan River，combine historical flow and the materials of fail sand rate，compare the difference of the design plan that have weir or not with A quasi-2D numerical sand mode1．Finally，provide the conclusion that the second design is more suitable to guarante the safely operation of hydropower station and reservoir．

Key words: waterway, analysis, reservoir, silt, quasi-2D numerical model

摘要： 通过对北盘江石板寨河段实际情况的勘察，结合历史流量和输沙率资料，采用准二维泥沙数学模型对石板寨 水库有堰和无堰两种设计方案进行了计算比较．最后给出了无堰方案更有利于确保电站及水库的安全运行的结论．

关键词: 水流, 分析, 水库, 泥沙, 准二维数学模型