The Dadu River

Dadu River is the largest tributary of Minjiang River system. It enters Liangshan in the north of Heima township of Ganluo county and leaves Wusi bridge. It is the boundary river between Ganluo county and Hanyuan County of Ya'an. Aba Tibetan and Qiang Autonomous Prefecture is 35 kilometers long and 130 meters wide. Aba Tibetan and Qiang Autonomous Prefecture has a drainage area of 4526 square kilometers. The shape of Dadu River Basin is long strip. The main tributary of Aba Tibetan and Qiang Autonomous Prefecture is Niri river. In addition, Aba Tibetan and Qiang Autonomous Prefecture belongs to Dadu River system, and Nanya river originates from Yele township of Mianning

The Dadu River

Dadu River is called Beijiang River, Jishui River, eshui River, moshui River, Dadu River, Mengshui River, Lushui River, Luhe River, Yangshan River, Yangshan River, Zhongzhen River, Yutong River, Jinchuan River and Tonghe River in ancient times.

Located in the Midwest of Sichuan Province of the people's Republic of China, it was historically regarded as the largest tributary of Minjiang River, a tributary of the Yangtze River in China.

However, from the perspective of Heyuan, it should be the main source of Minjiang River.

Dadu River originates from the southern foot of Guoluo mountain in the Animaqing mountains in Yushu Tibetan Autonomous Prefecture of Qinghai Province. Its upper source is zumuzu River (its upper source is maerko River and Aker River in Jiuzhi county). It receives suomo River and chuoshija River (Duke River and duoke River) in markang county through ABA County, and then it is called dajinchuan. It flows southward through Jinchuan county and Danba County, and it starts after receiving xiaojinchuan in the east of Danba county It is called Dadu River, then flows eastward through Luding County and Shimian County, and flows into Minjiang River through Hanyuan County and Ebian County in the south of Leshan City, with a total length of 1062 km (1050 km)

）The drainage area is 77700 square kilometers. There are many tributaries of Dadu River. There are 28 rivers with a drainage area of more than 1000 square kilometers and 2 rivers with a drainage area of 10000 square kilometers. The river network density is 0.39.

Dadu River Basin is a high risk area of geological disasters in China. There are 2212 potential geological hazards, mainly landslides and debris flows. Dadu River is rich in hydraulic theory, with an installed capacity of 23.368 million kilowatts. In May 1935, on the way of the Long March, the Chinese workers' and peasants' Red Army once crossed Anshunchang ferry in Shimian County and seized Luding Bridge across Dadu River in the west of Luding County. The basin is rich in tourism resources. The famous Mt. Emei, Mt. Gongga, Hailuogou and Jinkou Grand Canyon all have unique tourism landscapes.

(business card picture: Jinkou Grand Canyon section of Dadu River)

）

General situation of main stream

River course

Traditionally, there are three sources of Dadu River above dajinchuan: suomo River, chuosijia River (upper source is Duke River and duoke River in Qinghai), zumuzu River (upper source is zumuzu River, upper source is malke River in Qinghai)

））Zumuzu river is the main source of modern hydrological and water conservancy data.

The upper reaches of Dadu River are above Luding; the middle reaches are from Luding to Tongjiezi of Leshan City; and the lower reaches are below Tongjiezi.

Zumuzu River (zumuzu River) originates from gawuka, waeryi Township, Jiuzhi County, the peak of Bayan Har mountains in Qinghai Province

(for example, in manzhang Township, dari County, Guoluo Tibetan Autonomous Prefecture, Qinghai Province, the coordinates of the source are 100 degrees 17 minutes 32 seconds east longitude, 33 degrees 23 minutes 16 seconds north latitude, and the altitude of the source is 4579 meters.

）The upper source is called maerko River (Tama River, manri Tama River, Mako River)

）In the southeast, it flows through the East Tower of Jiuzhi County, and after Baiyu zuonaoko, it flows into duogongma, Bama County

. It passes Nimuda in the south, namaerqu in the right (also known as Ma Ke River, ma er Qu and ma ke River, and manzhang river is its left branch); it turns south by East, passes the east of banma County, passes yaritang, lighthouse and xiakepei in the south, turns East, right nanenzeke (also known as ZEKE), zuonayabagou and zherelangou; it turns east to the boundary river of Chuanqing; it passes daanyun in Dengta township

(Daar), turn south into Sichuan Province, which is the boundary river between Rangtang county and ABA county.

In Qinghai Province, maerko river has a catchment area of 6341 square kilometers, a length of 210 kilometers, a drop of 780 meters, and an average annual flow of 60.3 cubic meters per second.

In Sichuan Province, after younazequ, hereinafter referred to as maerko River (also known as ma'ke, ma'erqu, ma'erqu), it flows eastward to younamoke; that is to say, it enters ABA County, passes Gengda, Yier, younaglang River, zuonamolang River, guolanggou; then it goes eastward to Kehe Township, zuonagamuduo River, younayalang River; to dagniang, zuonaniko; and then it turns south In the south, it reaches Sergu, a tributary of Zuona, which is called zumuzu River (also known as zumuzu River). To the south, it turns to the southeast, where it is the boundary river between ABA and malkang counties, zuonaduodunlazagou; to the Shejiang River, it turns to the south into malkang County, to ribu Township, and to the right namulang valley. Turn southeast to pass Kangshan (Dawei), right namurjia River, xieguogou, zuonaritang ditch and kelaki ditch; then turn right namardab ditch and alalin ditch; then turn southeast to sandaping, zuonachabao River; pass zumumuzu Township in the south, where zumumuzu hydrological station controls the drainage area of 19896 square kilometers, annual average flow of 238m3 / S (30 years), and water level variation of 5.9m.

It flows southward through the station, suomo River, a tributary of Zuona, and chuoshia River, a tributary of Zuona. The following is renamed dajinchuan, which is the boundary river between malkang county and Jinchuan County; right nakoer valley; turn southeast flow, left nanaidong valley; South to dangba Township, right nakalajiao Valley, left nanpanlong River; South to Jinchuan County, right nasawajiao River; there is Dajin Shuiwen station in xialuo'er Township, which controls the drainage area of 40484 square kilometers, with an average annual flow of 520 cubic meters per second (32 years), and the water quality is high 4 M.

Dadu River goes south to the east of Jinchuan County, zuonasilizhai river. It also goes southwest, right nasonggou; zigzag southward, right nashisiman gully; to Anning Township, right nasdujiaogou, left nanninggou, tanchanggou, zengdagou; southwest flow is the boundary river of Jinchuan and Danba counties; left nashizugou; through gengzha, it enters Danba County, right najiasigou. In the south, it passes Badi Township, zuonamaiergou, younaerjiagou and shuijiazigou; in the south, it passes Bawang Township, geshizha River, a tributary of youna; in the north of Danba County, it passes Donggu River, a tributary of youna; in the East, it passes Hongjun bridge (Chuankou), and xiaojinchuan, a tributary of Zuona. Danba hydrological station controls the drainage area of 52738 square kilometers, with an average annual discharge of 741 cubic meters per second (29 years), and a water level variation of 10.6m. In the southeast, it goes through gezong township (also known as little Chengdu), right nagzonggou, left nahanniu River, and then into Kangding County. Zuonamenzigou, younadaligou in front of Kongyu Township in the south, zuonasunkou in the south, tigou in the south, yeniugou in the south, zuonapenggou in the south, zuonajintang River in the south, younayangchanggou in the south, and Kangding River in shizan town (Yutong) in the south. After passing through Chaoba in the south, it enters Luding County, which is controlled by Luding hydrological station. The drainage area is 58943 square kilometers, the average annual flow is 895 cubic meters per second (19 years), and the water level changes by 6.7m. Pass the station to the west of Luding County. The upper reaches of Dadu River end here.

Dadu, Henan, passes Luding County, and the famous Tiesuo bridge, right namo river. Then it passes lengqi town in the south, at zuonahuayuangou in Hekou, to yajiageng River in maoziping in the south, to maocaopo in the south, to Liangcha River in the right, to Tianwan River in the right, and then to Shimian County. It flows from south to east to Anshun Township, right to Songlin River, then to Xiaoshui River, turns from east to north, right to Nanya River, passes through Shimian County, and is controlled by Shimian hydrological station below, with a drainage area of 65946 square kilometers, annual average flow of 1200 cubic meters per second (27 years), and water level variation of 6.8m. Passing through Yonghe and Yingzheng, it twists and turns from east to north, right naxiangshuigou, right nalaerba gully, left nagaoqiao gully, right nahuashuo gully; Northeast flow is Shimian and Hanyuan County boundary river, to Xiaobao, right nazailuo River, left nadachong River; below there is a bend, East into Hanyuan County. It passes Qingfu Township, Zuona Liusha River, turns to the east by south, Zuona Baiyan River, right Naxi Street River, and turns to the south for the boundary river of Hanyuan and Ganluo counties. Pass Pubugou, reach Niri in the South and right Nari River; turn to the East and Chengdu Kunming Railway extends parallel with it. Pass wusihe Town, turn north by East, left namatogou and huangmugou; turn east by south, enter Jinkouhe District, right naxiaohezi. Zigzag to the northeast to Jinhe Town, Zuona Shunshui River; turn to the southeast, it is the boundary river between Jinkou River District and Ebian County. After the right naguanliao River, it enters Ebian County in the East, Luohui in the East and Gongzui reservoir area. It is controlled by shaping hydrological station, with a drainage area of 75016 square kilometers, an average annual flow of 1370 cubic meters per second (20 years), and a water level variation of 11.7m.

It passes the Baisha River on the right side of the station, the north of Ebian County on the east side, gefan and Xinchang on the northeast side, and the Longchi River on the left side. In the northeast, it is the boundary river between Ebian County and Emeishan City. Pass the youna River in Maoping town. It is the boundary river between Ebian County and Leshan City in the East, and the gravity dam site of Gongzui reservoir in the south of Fandian Valley in Zuona, Fandian township. Then southeast into Tongjiezi reservoir area, across Wudu town, Tiancun, Zhangshan, also for Leshan City and Muchuan County boundary river. Then east into Leshan City, north to tongci township (Tongjiezi). The middle reaches end here.

Dadu River runs northward through Tongjiezi dam to Fulu Town, where there is a hydrological station to control the drainage area of 76452 square meters

Chinese PinYin : Da Du He