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The Shapotou National Nature Reserve in the Ningxia Hui Autonomous Region is a typical arid region in China. There is an exceptionally serious problem of surface water resource conservation, and dynamic monitoring of surface water with the help of water indices can help to elucidate its change patterns and impact mechanisms. Here, we analysed the characteristics of interannual variation in surface water area in the study area from 1992–2021. The correlation coefficients of the surface water area in the previous year and the contemporaneous water bodies of the Yellow River with the total surface water area (TSWA) were calculated. The results show the following: ① In terms of the classification accuracy of the two methods, water indices and support vector machine classification, water indices are more suitable for water body extraction in the study area. In particular, the three water indices, NDWI, MNDWI and AWEIsh, were more effective, with average overall accuracie

Yellow riverChina generalYangtze riverChang liushuiUnited statesXiaohu lakesShapotou national natureUnited states geological surveySha botou national nature reserve of ningxiaNingxia zhongwei shapotou national natureEngineering of the chinese academy sciencesNingxia zhongwei shapotou national nature reserve administrationInstitute of coldEnhanced thematic mapper plusOperable land imagerOperational land imager