This study estimates water volume variations in the Fontaine des Gazelles Dam in the province of Biskra using high-, medium-, and low-resolution digital elevation models (DEMs). The water surface was extracted using NDWI, and the volume of storage was obtained using the water elevation and spatial analysis. The results obtained in comparison with Peng equation show that there exists a significant change in the water surface. This represents a decrease of more than 29 hm3 between 2005 and 2020, on which precipitations were found to be the main factor of these changes. For validation purposes, NRMSE and MAPE were used. Respectively, with values of 1.30% and 1.50% for Alos Palsar, 8.10% and 8.70% for SRTM1, and 8.20% and 10.10% for SRTM3, it is clear that Alos Palsar performs much better results. This leads us to conclude that Alos Palsar is the most reliable to be adopted in studies related to water volume variations.

这项研究使用高，中和低分辨率数字高程模型（DEM）估算了比斯克拉省Fontaine des Gazelles大坝的水量变化。使用NDWI提取水面，并使用水位高程和空间分析获得储水量。与Peng方程比较得出的结果表明，水面存在显着变化。这意味着在2005年至2020年之间减少了超过29 hm3，而降水是这些变化的主要因素。为了进行验证，使用了NRMSE和MAPE。显然，Alos Palsar的值为1.30％和1.50％，SRTM1的值为8.10％和8.70％，SRTM3的值为8.20％和10.10％，很明显，Alos Palsar的效果要好得多。