Abstract
Understanding the variation regularity of water extent can provide insights into lake conservation and management. In this study, inter- and inner-annual variations of water extent during the period of 1987–2020 were analyzed to understand the temporal and spatial distribution characteristics of Dongting Lake. We applied the Multiple Index Water Detection Rule to extract the Dongting Lake water extent quickly and accurately based on Google Earth Engine platform, and then assessed the extraction accuracy. The water surface analysis results showed that (1) based on sustainable development goals (SDG) 6.6.1, the trend of water extent showed the downward fluctuating trend from 1987 to 2020, with the overall average water extent being 1894.48 km². (2) Among the monthly average water area, the largest extent was 2477.14km² (July) and the smallest was 848.14 km² (January). Among the seasonal mean water area, summer was the largest, with an area of 2438.06 km², and winter was the smallest at 967.34 km². (3) For the water inundation frequency, seasonal water bodies accounted for the largest proportion, with 1577.85 km²; the nonwater area was the smallest, with the area of 573.02 km²; and the permanent water area was 1086.21 km². Through the analysis of the historical water body extent of the long time series of Dongting Lake, this study reflected support for SDG, for which the research idea and design can help us understand the importance and feasibility of the SDG 6.6.1 indicator.
Highlights
THE SDGs (Sustainable Development Goals) are a series of new development goals that are similar to the MDGs (Millennium Development Goals) set by the United Nations
Through the analysis of water extent, the maximum water extent of Dongting Lake was 3060.30 km2, which occurred on Jul 06, 1998 and the minimum water extent was 524.09km2, which occurred on Jan 14, 2014 from 1987 to 2020 (see Fig. 5(a))
All of them fully showed that the water extent changes of Dongting Lake had obvious inter-annual and intra-annual characteristics, which was a typical seasonally changing lake
Summary
THE SDGs (Sustainable Development Goals) are a series of new development goals that are similar to the MDGs (Millennium Development Goals) set by the United Nations. With the intensification of global warming, water resources have been regarded as an important factor influencing human survival and development, and their changes are receiving great attention. Water-related ecosystems play an important role in the water resource [1], of which, lakes are especially important, as their locations and persistence are both affected by climate and human activity and affect climate biological diversity and human well-being [3]-[5]. The monitoring of the lake surface water extent will have very important research significance for monitoring SDG 6.6.1 and understanding the law of lake changes and the management of local water resources. Lake surface area is an important parameter for exploring the extent of lake ecosystems; longtime series analyses can help us to explore the lake's spatiotemporal changes and the impact of climate and human activities in depth
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