Halac reappeared after nearly 300 years of drought. Why is Halac called Dunhuang West Lake?

Hallac is of great significance as a water resource in the desert.

Ma Haiyan, Senior Engineer of Water Resources Management Bureau of Danghe River Basin in Jiuquan City: After the implementation of the project of diverting Haji Party, the ecological water discharged by Danghe River and Shule River will further increase, and the wetland shrinkage and degradation in West Lake Nature Reserve will be effectively curbed to prevent the Kumtag Desert from invading eastward, which is of far-reaching significance for protecting Dunhuang oasis and Dunhuang culture.

Halac originated in Shule River.

Shule River is the second largest river in Hexi Corridor of Gansu Province, with a total length of 540 kilometers and a drainage area of 20 1.97 square kilometers. It originates between Tuolai Nanshan and Shule Nanshan in the west of Qilian Mountain, flows through the alpine grassland in Subei County in the northwest, passes through Daxue Mountain to Tuolai Nanshan Canyon, and passes through Changma Basin. Before leaving Changma Gorge, it was upstream, with abundant water and rapid water flow. From Changma Gorge to Corridor Ping, it is the middle reaches, below the Shuangta Babao Reservoir in Anxi, and it is the downstream. Five reservoirs have been built in the whole basin, with a total area of 6.5438+0 million cubic meters, of which Shuangta Dam Fort, Danghe Reservoir and Chijinxia Reservoir are larger.

Hallac affects the lives of residents.

Shule River, inland river. In ancient times, water was the end, and water was hidden. In the northwest of Gansu Province, the west section of Hexi Corridor. "Shule" means more water in Mongolian. Shule Nao originates from Shule Nao between Shule Nanshan and Taolai Nanshan in Qilian Mountain, flows through the swamp in the northwest, collects alpine snow, glacial meltwater and mountain precipitation, and flows into Changma Basin in the north of Huaer levee, which is called Changma River. Out of Changma Basin and across the alluvial-diluvial plain in Hexi Corridor of Changma Gorge. The river course is radial, and a large amount of water leaks, which becomes an undercurrent; Exposed to the front of alluvial fan to form 10 Daogou spring river; These rivers flow northward into Bloemje and meet to form Bloemje River, also known as Shule River. Then it flows westward through Shuangta Reservoir, through Anxi and reaches the north of Dunhuang. Danghe River flows from the south to Hala Lake (also known as Heihaizi, now Yulin Spring) in the west. The total length is 580 kilometers. The basin covers an area of 39,500 square kilometers. Shule River was injected into Lop Nur in Xinjiang in prehistoric times. Due to the influence of climate change and human activities, it has retreated to Anxi West Lake.

Qilian Mountain area above Changma Reservoir, with a river length of 328 kilometers and a drainage area of 1. 1.000 square kilometers, is a runoff formation area with an annual runoff of 839 million cubic meters. Hexi corridor area below changma reservoir. It is the area where runoff disappears and the water flows over. It is the water source of agricultural production, urban industry and people's life in Anxi.