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Remote Sens. 2018, 10(9), 1441;

Long-Term Changes in Water Clarity in Lake Liangzi Determined by Remote Sensing

2,* and 1,*
National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Sciences, Wuhan University, Wuhan 430072, Hubei, China
Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu, China
Authors to whom correspondence should be addressed.
Received: 24 August 2018 / Accepted: 6 September 2018 / Published: 10 September 2018
(This article belongs to the Section Remote Sensing in Geology, Geomorphology and Hydrology)
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Water clarity (via the Secchi disk depth, SDD) is an important indicator of water quality and lake ecosystem health. Monitoring long-term SDD change is vital for water quality assessment and lake management. In this study, we developed and validated an empirical model for estimating the SDD based on Landsat ETM+ and OLI data using the combination of band ratio of the near-infrared (NIR) band to the blue band and the NIR band. Time series data of remotely estimated SDD in Lake Liangzi were retrieved from 2007 to 2016 using the proposed models based on forty Landsat images. The results of the Mann–Kendall test (p = 0.002) and linear regression (R2 = 0.352, p < 0.001) indicated that the SDD in Lake Liangzi demonstrated a significant decreasing trend during the study period. The annual mean SDD in Lake Liangzi was significantly negatively correlated with the population (R2 = 0.530, p = 0.017) and gross domestic product (R2 = 0.619, p = 0.007) of the Lake Liangzi basin. In addition, water level increase and the flood have an important effect on SDD decrease. Our study revealed that anthropogenic activities may be driving factors for the long-term declining trend in the SDD. Additionally, floods and heavy precipitation may decrease the SDD over the short term in Lake Liangzi. A declining trend in the SDD in Lake Liangzi may continue under future intense anthropogenic activities and climate change such as the extreme heavy precipitation event increase. View Full-Text
Keywords: water clarity; Landsat; Lake Liangzi; anthropogenic activities; floods water clarity; Landsat; Lake Liangzi; anthropogenic activities; floods

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Xu, X.; Huang, X.; Zhang, Y.; Yu, D. Long-Term Changes in Water Clarity in Lake Liangzi Determined by Remote Sensing. Remote Sens. 2018, 10, 1441.

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