常用的两种河道槽蓄量计算方法，存在有效计算参数较少，计算粗略及结果不能可视化的缺点。基于DEM模型的河道槽蓄量计算方法，是在矢量化河道地形图上提取带高程信息的图形要素生成河道的数字高程模型，给定计算边界，然 后依据DEM原理计算河道槽蓄量的新方法。该方法不仅可以提高计算结果精度，而且结果可 以实现三维可视化，能确定槽蓄量分布状况，有利于防洪抗险的决策。 

Two conventional river - channel storage - volume calculation methods have following shortages: a few parameters can be used, and results are not accurate and cant be visualized. The river - channel storage - volume calculation on DEM is a new calculation method. The calculating steps are as follow s: First, pick - up elevation data about the lines and points on a vector river topographic map to construct a rivers digital elevation mode l; Then, give calculation conditions; At last, calculate the river - channel storage - volume on the theory of DEM. Using the method to calculate can not only obtain more accurate results, but also can realize river - channel storage - volume 3D visualization and view the distribution of the river scouring - silting.