基于DEM与遥感影像的水库库容快速估算

Estimation of Reservoirs Capacity Based on DEM and Remote Sensing Image

遥感技术周期性、宏观性、实时性等优点,使其在监测库容具有无可比拟的优势。为了给水库管理提供一种快速估算库容的方法,利用DEM建立新丰江水库"库面积-库容"模型,并从不同时相的中巴影像中提取库面积,再利用模型计算库容;继而获取每一时相的水库水位观测值,利用水库固有的"库容曲线"计算库容。最后将两个结果进行比较分析,发现前者与后者的相对误差最小只有0.47%,大部分不超过10%,且具有很好的相关性。模型估算精度虽达不到传统测量计算方法,但其快速性、周期性、低成本是传统方法无法比拟的。实验结论表明,利用DEM与遥感技术监测库容,具有较好的实用价值。

Remote sensing technology has periodically,macro,real time and other advantages. In the monitoring of reservoirs capacity,it has the advantage of there is nothing comparable to this. In order to provide a quick method for estimating reservoir capacity,the DEM is used to extract from the Xinfengjiang Reservoir water level of the water information,to comput library area and storage capacity and establish ＂reservoir area-capacity ＂ function. Access to the Xinfengjiang Reservoir and calculation of the images,each image imaging library area,using＂reservoir area-capacity＂functions to calculate capacity; At the same time for each image imaging when reservoir levels practical observations, using a reservoir inherent ＂water capacity curve, calculate the corresponding＂storage capacity; Finally the two capacity the results of comparative analysis,found that the relative error of the former and the latter is best reached 0. 47%,much less than 10%,and has a good correlation. Although the precision of model estimation can not reach the traditional method of measurement,its speediness,periodicity and low cost are unparalleled by the traditional method. The results and hydrological station actual observed value of comparative analysis,although there are some errors,but have good correlation.