基于极化SAR影像绘制库容曲线的研究

Study on drawing storage capacity curve based on polarimetric SAR image

我国部分水库没有库容曲线或水库库容曲线年代久远,不能真实地反映实际库容情况。为精准高效地掌握库容曲线,以王家湾水库为例,基于多时相极化合成孔径雷达(Synthetic Aperture Radar,SAR)影像数据,利用多分量散射模型(multiplecomponent scattering model,MCSM)提取水库水域的面积,再结合水库水位观测资料,拟合出水位与面积的函数关系式,利用微积分原理推演出水库库容曲线,通过水量平衡法进一步证实库容曲线的精度。结果显示水量平衡法计算库容增加值与库容函数及库容曲线推求库容增加值差值很小,证明了库容函数及库容曲线的正确性。研究结果表明,利用极化SAR影像绘制库容曲线方法在保证库容精度的前提下,能显著提高绘制效率,可节省大量人力、物力、财力。

Some reservoirs in China have no storage capacity curve or the reservoir storage capacity curve is outdated,which can not truly reflect the actual storage capacity.In order to accurately and efficiently master the reservoir capacity curve,taking Wangjiawan Reservoir as an example,based on the multi-temporal polarimetric SAR(Synthetic Aperture Radar)image data,the area of the reservoir water area is extracted using the multi component scattering model(MCSM)decomposition method,and then combined with observation data of the reservoir water level,the functional relationship between water level and area is fitted,and the reservoir capacity curve is deduced using the calculus principle,and the accuracy of the reservoir capacity curve is further confirmed by the water balance method.The results show that the difference between the calculated value of storage capacity increase by the water balance method and the calculated value of storage capacity increase by the storage capacity function and the storage capacity curve is very small,which proves the correctness of the storage capacity function and the storage capacity curve.The research in this paper shows that the method of drawing reservoir capacity curve using polarimetric SAR image can significantly improve the drawing efficiency and save a lot of manpower,material and financial resources on the premise of ensuring the accuracy of reservoir capacity.