Abstract
The development associated with rapid industrialization and urbanization in Dongting Lake region has been more complex due to large water demand. Therefore study of water variation within the lake region is necessary for wetland protection, conservation and its sustainable management. In this study monitoring of different Hydrological Control Stations, the calculation and analysis was carried out over 2014 based on hydrological data. The results indicated that seasons are the typical main driving factor for water variation in the Dongting Lake; among the rivers, Xiang, Zi, Yuan and Li (also known as “Sishui”) accounts for the major part of the inflow discharge into the lake, and therefore the overall trend is featured by a flow pattern from the southwest to the northeast (Chenglingji outlet). The results also indicated that the inflow discharge of major rivers (Li, Yuan, Zi and Xiang) dominates other rivers with approximately 58% input to the lake. On the other hands the discharge from Yangtze River is very low in dry season from December to February, and it becomes high up to the maximum level of 28500 m3/s during flood period from June to September which is approximately 42% of its annual inflow amount. Similarly, the annual input comparison between Yangtze River and major rivers showed that the large amount of inflow from Yangtze is observed from June to September, which accounted 76% of its total annual inflow to Dongting Lake. While the high inflow from major rivers is observed from May to August, which is estimated at 60% of the major rivers total annual inflow to Dongting Lake. This study has important practical significance for sustainable development of the water management in the Dongting Lake Basin. Key words: Rivers, Dongting Lake, hydrological control stations, inflow discharge, Yangtze River.
Highlights
Dongting Lake has served as an essential buffer zone in times of flood, receiving excess water from Yangtze River; which is China's mightiest river and protecting many downstream
The objectives of this study were to identify Hydrological Control Stations, calculation of water inflow and outflow to the lake and yearly contribution of major rivers in order to estimate seasonal water variation in the lake region, which is important for its sustainable use and management
The data from monitoring stations were collected and analyzed. It consists of 3 outfalls as inflow from Yangtze River and inflow from other four rivers (Yuan River, Zi River, Xiang River and Li River) system
Summary
Dongting Lake has served as an essential buffer zone in times of flood, receiving excess water from Yangtze River; which is China's mightiest river and protecting many downstream. The lake has shrunk dramatically, causing scientists to begin investigating the causes of these changes and their effects on one of the country's most important lakes. It is 2,625 km2", commented Jiang Yong, on the area of the lake. He mentioned that, Mud and sand keep silting up in the south of the lake. The capacity of the lake storage is becoming smaller.
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