Inter-annual variations of Poyang Lake area during dry seasons: characteristics and implications

Variations in a lake area constitute an important indicator of the modifications of the lake hydrology. This paper explores the inter-annual variations of the Poyang Lake area during the dry seasons occurringwithin the 1961 to 2010 period and further quantifies the severity of dryness recently endured during the 2000s. A physically based hydrodynamic model of Poyang Lake established the relation between the lake area and lake level. The lake area was calculated using the observed lake water level. Results indicated the average lake area in the dry seasons was 1,015 km. There was a considerable inter-annual variation of theminimum lake area that varied from702.8 km to 1,259.7 km. Poyang Lake experienced themost severe dryness in the 2000s, resulting in an average lake area during 2001 to 2010 of 124 km less than that of the preceding period. During the dry seasons, the catchment of the river discharge is likely the primary cause of the changes in lake area. This study evaluated the inter-annual variations of the Poyang Lake over a period of 50 years. Our results may provide support for an integrated management of the lake-catchment system, securing the water supply. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits copying, adaptation and redistribution, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/). doi: 10.2166/nh.2016.308 Mengfan Li Qi Zhang (corresponding author) Yunliang Li Jing Yao Zhiqiang Tan Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China E-mail: [email protected] Mengfan Li University of Chinese Academy of Sciences, No. 19 Yuquan Road, Beijing 100049, China