Inter- and intra-annual trend analysis of water level and flow in the middle and lower reaches of the Ganjiang River,China |
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| Authors: | Di Zhu Yue Ben Xinfa Xu |
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| Institution: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University , Wuhan, China;2. Jiangxi Provincial Institute of Water Sciences , Nanchang, China |
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| Abstract: | ABSTRACT The Ganjiang River is the largest tributary of Poyang Lake in China, and its hydrological regime variation greatly affects the utilization of regional water resources and the ecological environment of the lake. In this study, a novel trend analysis method, the Moving Average over Shifting Horizon (MASH), was applied to investigate the inter- and intra-annual trends of flow and water level from 1976 to 2016 at the Xiajiang and the Waizhou hydrological stations in the Ganjiang River. The Significant Change Rate Method (SCRM) was proposed to determine the MASH averaging parameters. The trend analysis results show a statistically significant decrease in water level series throughout the year and the relationship of flow and water level have changed greatly at the Waizhou station. The sediment load reduction, large-scale sand mining and water level decrease of Poyang Lake are identified as the main causes for the water level decrease. |
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| Keywords: | trend analysis Moving Average over Shifting Horizon (MASH) Significant Change Rate Method (SCRM) Mann-Kendall trend test water level flow Ganjiang River China |
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