Eutrophic status of hengshui lake based on chromaticity angle information monitoring research
[Objective]Nutritional status is an important aspect of evaluating the characteristics of water environment changes in lakes and reservoirs,and achieving accurate and large-scale dynamic monitoring of it plays a very important role in analyzing the causes of eutrophication.[Methods]The chromaticity angle information of Landsat 8 remote sensing data was utilized to construct a chlorophyll a concentration inversion model suitable for Hengshui Lake,and its accuracy was tested.Based on this,the nutri-tional status of Hengshui Lake was monitored from 2013 to 2022,and its relationship with climate factors such as temperature and precipitation was analyzed.Remote sensing monitoring was conducted on five ecological replenishment processes from 2018 to 2019.[Results]The result show that:(1)the model is relatively reliable,with a determination coefficient R2 of 0.79,root mean square error and average percentage error of 0.0018 and 4.5%,respectively;(2)In the past decade,the nutritional sta-tus of Hengshui Lake has improved to a certain extent,and its spatial changes show a phenomenon of low in the north and high in the south.Among them,the nutritional status of Nanguan Sluice and Nanguan New Sluice is relatively high compared to other lake areas;(3)Through remote sensing monitoring of five ecological replenishment processes,it was found that ecological replenishment has a certain positive effect on improving the nutritional status of Hengshui Lake,especially near the Wangkou Gate at the inlet,where its response to ecological replenishment is most timely.The nutritional status of Hengshui Lake is a prob-lem influenced by multiple factors such as internal,external,and hydrodynamic factors.There are some fluctuations in certain areas,and further research is needed to investigate their internal relationships.[Conclusion]It is feasible to monitor the nutri-tional status of Hengshui Lake through remote sensing method,which can better reveal the overall pattern of changes in the nutri-tional status of Hengshui Lake and effectively monitor the ecological water replenishment process.This provides important techni-cal support for the monitoring of the water environment and the management of nutritional status in Hengshui Lake wetlands.
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