Spatial and temporal evolution characteristics of lake shoreline based on digital shoreline analysis system (DSAS): taking Lake Shengjin as an example
In order to reveal the spatial and temporal evolution characteristics of the shoreline of the Lake Shengjin from 2000 to 2020, a quantitatively analysis of the spatial and temporal evolution of the lake's shoreline was carried out by using the digital shoreline analysis system (DSAS) with Landsat remote sensing images of five years as the data source. The results showed that, during the period of 2000 to 2020, the shoreline changes of Lake Shengjin were mainly concentrated near Yangetou, Shegan, Dazhou, Qixingdun, Tangtian and Lake Maliao. The main factors affecting the shoreline change included precipitation, aquaculture, deforestation, excessive irrigation and other human activities. The change trend of the lake shoreline from 2000 to 2015 was complex, with expan-sion and contraction coexisting. In this stage, the main factors affecting the shoreline change were aquaculture, deforestation, excessive irrigation and other human activities. After the environment of Lake Shengjin was im-proved, from 2015 to 2020, precipitation became the dominant factor affecting the change of lake shoreline, due to the increase of precipitation, most of the shorelines grew slowly, and the lake shorelines near Shegan grew signif-icantly. The lake meadow of Lake Shengjin was seriously degraded, silt accumulation was strict, and it was more disturbed by human activities. As a result, the shoreline of the lake near Shegan fluctuated frequently and changed violently. The area near the Shentou Mountain (located in the lower part of the lake) and Tangtian was greatly af-fected by deforestation, the shoreline changed frequently. There were many paddy fields near the Lake Maliao, and over-irrigation led to a small shrinkage of the shoreline near the Maliao Lake. The results of the study can provide a theoretical basis for lake ecological environment protection and monitoring.
Lake ShengjinDSASlake shorelinespatial and temporal evolutioninfluence factor
万方数据
