横沙岛位于长江入海口的最东端，因横亘于长江口，故名横沙。
Hengsha Island is located in the easternmost part of the estuary of the Yangtze River. It's named by Hengsha Island because it's across the Yangtze River.
因此，针对横沙岛目前的潮滩环境进行研究，并就潮滩质量和发展趋势进行评价非常必要。
So it is very necessary to study tidal flat environment of Hengsha, and to qualitatively assess the environment.
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