Engineering Research Center of Building Energy Efficiency Control and Evaluation, Ministry of Education, Hefei, China; School of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei, China.
Engineering Research Center of Building Energy Efficiency Control and Evaluation, Ministry of Education, Hefei, China; School of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei, China E-mail:
Water Sci Technol. 2024 Apr;89(8):1913-1927. doi: 10.2166/wst.2024.086. Epub 2024 Mar 19.
This study compared two different methods, the satellite altimetry-based and DEM (digital elevation model)-based, for estimating lake water volume changes. We focused on 34 lakes in China as the testing sites to compare the two methods for lake water volume changes from 2005 to 2020. The satellite altimetry-based method used water levels provided by the DAHITI (Database for Hydrological Time Series of Inland Waters) data and surface areas derived from Landsat imagery. The DEM-based method used the SRTM DEM data in combination with Landsat-derived lake extents. Our results showed a high degree of consistency in lake water volume changes estimated between the two methods ( > 0.90), but each method has its limitations. In terms of temporal coverage, the satellite altimetry-based method with the DAHITI data is limited by missing water level data in certain periods. The performance of the DEM-based method in extracting lake shore boundaries in regions with flat terrains (slope <1.5°) is not satisfactory. The DEM-based method has complete regional applicability (100%) in the Tibetan Plateau (TP) Lake Region, yet its effectiveness drops significantly in the Xinjiang and Eastern China Plain Lake Regions, with applicability rates of 50 and 40%, respectively
本研究比较了两种不同的方法，即卫星测高法和数字高程模型（DEM）法，用于估算湖泊水量变化。我们以中国的 34 个湖泊作为测试点，比较了这两种方法在 2005 年至 2020 年期间估算湖泊水量变化的能力。卫星测高法使用了 DAHITI（内陆水域水文时间序列数据库）数据提供的水位和 Landsat 图像得出的表面积。DEM 法使用 SRTM DEM 数据并结合 Landsat 提取的湖泊范围。我们的研究结果表明，两种方法估算的湖泊水量变化之间具有高度一致性（>0.90），但每种方法都有其局限性。在时间覆盖范围方面，使用 DAHITI 数据的卫星测高法受到某些时期水位数据缺失的限制。DEM 法在提取平坦地形（坡度<1.5°）地区的湖泊岸线方面的性能并不理想。DEM 法在青藏高原（TP）湖区具有完全的区域适用性（100%），但其在新疆和中国东部平原湖区的有效性显著下降，适用性分别为 50%和 40%。
