General situation of Guanyinge reservoir basin

The Taizi River originates from Hongshili Mountain in Xinbin County, Liaoning Province, and flows through Benxi and Liaoyang from east to west. After the Sancha River and Hunhe River meet in Haicheng County, they are called Daliao River and join the Bohai Sea in Yingkou City. The main stream is 4 13 km long and the drainage area is 13883 km.

Due to the influence of the intersection of cold and warm air masses in the north and south, heavy rains often occur. The weather systems that produce heavy rain mainly include typhoons, high-altitude troughs, low-pressure cold fronts and cyclones in North China. A rainstorm usually lasts about 3 days, mainly concentrated in 1 day.

The average annual rainfall of Taizi River is 700 mm ~ 900 mm ... The rainfall is extremely uneven in a year. The rainfall from June to September accounts for 70% ~ 80% of the whole year, especially from July to August, accounting for about 60% of the whole year. Rainfall is usually concentrated in several heavy rains. Due to the concentration, intensity and steep terrain of the rainstorm, the reservoir inflow flood has the characteristics of flash flood, with short duration, large fluctuation, fierce momentum, high flood peak and relatively small flood volume.

Guanyinge Reservoir is a multi-year regulating reservoir with an average river slope 1.25‰ and an average annual inflow11.1×108m. The downstream of the reservoir has a large population, developed traffic and arduous flood control task. The upstream of the reservoir area has beautiful scenery and good water quality. The Taizi River and its tributaries, South Taizi River and Qinghe River, mainly have three estuaries, namely Xiajia, Nandian River and Qinghe Town. The water surface area of the reservoir area is 6 1 km2. The average annual precipitation near the dam site is 778. 1 mm. The annual average water surface evaporation is 669.5 mm. ..

The reservoir is located on the west side of Changbai Mountain range. Soluble rocks such as limestone are widely exposed in the river valleys and banks of the reservoir area, and insoluble shale, quartzite and metamorphic rocks are continuously distributed around and around the reservoir. There are dense forests and good vegetation in the basin, mainly oak and Pinus tabulaeformis, followed by secondary forests such as larch and poplar. The soil is brown soil and calcareous grass brown soil, with slight soil erosion and good ecological environment. The green hills on both sides of the strait are steep, with boats flooding the reservoir area and water surrounding the green hills. The scenery is beautiful and pleasant, especially in early spring and autumn, and the fog is transpiration, just like Penglai fairyland.