基于水下地形拟合的V型河道库容计算方法

水库库容决定着水库调节径流的能力和它所能提供的效益指标的大小,是水库前期论证的主要依据之一,也是水库调度运行的重要参数。在厄瓜多尔某水库规划设计中,探索在缺失水下地形数据条件下运用V型河道库容计算方法,对具备V型河谷特征的水库进行精确库容测算。该方法利用河道水上数字高程模型及相关数据来预测河道水下深度,从而在缺失河道水下地形的情况下,拟合出V型河道的整体高程模型。应用效果表明,该计算方法相较于仅通过水上地形数据得到的库容值更接近于真实值,误差在5%以内。

V-shaped reservoir capacity calculation based on fitting of underwater terrain

As an important parameter for earlier demonstration and reservoirs' operation, the reservoir capacity determines the runoff regulating performance and the benefits of reservoir. In the planning stage of a V-shaped reservoir in Ecuador, we explored the approach to calculate accurately its capacity in the absence of underwater terrain data. The method uses above-water DEM and other related data to estimate the underwater depth, and further fits the total DEM of the V-shaped channel. The application showed that the presented method could obtain more realistic reservoir capacity with an error within 5% compared with traditional method that only uses above-water DEM.