Hydrological data of Hunan Province can be found on Hunan Hydrological Network, whose website is Hunan Hydrological Network-Reservoir Hydrology.
1, Baidu search "Hunan Hydrological Network", click "Hunan Hydrological Network" official website, which can query hydrological data of Hunan Province.
2. Click "Public Service" on the homepage of "Hunan Hydrological Network" to enter the "Public Service" interface to query the hydrological data of Hunan Province.
3. In the "Public Service" interface, you can query "Satellite Map", "Rainfall Distribution Map" and "Weather Map" and click "Reservoir Water Regime".
4. Click the query time in the interface and click "OK" to query and modify the hydrological data in Hunan Province.
5. You can also select data such as "Daily Report of Water Regime in the whole province" and "Daily Report of Control Station" in the secondary interface.
Hydrological characteristics of Dongting Lake water system
(A) the hydrological characteristics of Xiangjiang River Basin
Xiangjiang River is 856 kilometers long, with a drainage area of 94,660 square kilometers, and the whole province has a drainage area of 85,383 square kilometers, accounting for 89. 2% of the basin area. It is the largest river in Dongting Lake system.
1. Water level change.
The change of water level in Xiangjiang River and its tributaries is closely related to the annual distribution of precipitation in the basin. The rainy season begins in March every year, and the river rises. Entering the flood season after April, the precipitation continues to increase and the water level continues to rise. April-July is the season with the highest water level.
2. decisive victory.
Xiangjiang river basin is the first of the "four waters", but its annual runoff is second only to running water.
The annual distribution of Xiangjiang River runoff mainly depends on the annual change of precipitation. It is characterized by long flood season, large flow change and short and stable dry season. The flow began to increase in late March, and rose sharply in April, entering the flood season. May and June saw the largest flow, reaching the peak of the whole year.
From April to July, the continuous average runoff of the maximum four months accounts for more than 60% of the annual runoff, and the runoff begins to decline after July. However, in August and September, sometimes due to typhoon interference or heavy rain, sometimes the water rises, which still belongs to the flood season, and the runoff in flood season accounts for more than 70% of the annual runoff. 10 months later, the flood season ends and enters the normal period; The dry season is from 65438+February to the following February, and the runoff is the smallest with little change, accounting for about 3% of the annual runoff of 65438+ 10.
3. Sediment concentration.
The Xiangjiang River Basin is characterized by complex rock strata, different natural and geographical conditions and different human factors, which makes the sediment concentration in the basin change with time 106. Although the mountain areas where the tributaries flow upstream are steep, they are mostly hard rock layers with good vegetation, less erosion and siltation and less sediment concentration.
The middle and lower reaches and some tributaries flow through Quaternary laterite and loose deposits, and Huagang rocks are distributed in some areas. Weathered shell is thick and the soil is loose. Whenever it encounters heavy rain, it is easy to be washed away, resulting in soil erosion, especially in some small watersheds with lack of vegetation, the erosion is more intense and the sediment concentration along the way is gradually increasing.