Brief introduction of three major rivers in Hainan

Nandu River, Changhua River and Wanquan River are the three major rivers in Hainan Island.

1. Nandu River is rich in water and has a large flow. There are obvious wet and dry seasons and heavy rains in the basin climate, so the river flow and water level often rise and fall sharply. Every time after a rainstorm, flash floods occur and the river surges, and the maximum flood peak can be reached immediately. There are two peaks of river water level in a year, one in May and the other in September and October.

Songtao Reservoir was built in the upper reaches of Nandu River in p>1961, with a storage capacity of 3.1 billion cubic meters, which has the benefits of flood control, irrigation and power generation, and plays an important role in overcoming the unstable flow. The river bed gradient in Nandujiang Delta is small, and the river channel silts up quickly. During the typhoon and rainstorm in summer and autumn, the tide flows backwards, and sometimes there are flood and tide disasters.

2. Changhua River, also known as Changjiang River, is the second longest river in Hainan Island. It originates from Kongshiling in Limushan Mountain area in Qiongzhong, Hainan Island, and runs across the central and western parts of Hainan Island. The river flows from northeast to southwest through Wuzhishan in Qiongzhong, turns to northwest in Ledong County, and finally flows into the South China Sea from Dongfang City through the west of Changhua Port in Changjiang County, and rushes out a wide horn at the estuary.

The main stream of Changhua River is 232km long, with a drainage area of 5,15km2 and a total drop of 1,27m. Changhua County in Sui Dynasty ruled on the north side of today's estuary, hence the name Changhua River.

3. Wanquan River was called Duohe in ancient times. It is the third largest river in Hainan Island, China, located in the east of Hainan Island, Hainan Province, China, and originated from Wuzhishan, with a total length of 163 kilometers and a drainage area of 3,693 square kilometers. The typical tropical rain forest landscape and ingenious landforms along the banks of the river are breathtaking. Wanquan River is an unpolluted tropical river with beautiful ecological environment in China, and is known as the "Amazon River" in China.

Extended information:

Seen from the plane, Hainan Island is like an oval Sydney, lying across the blue waters of the South China Sea. The long axis of Hainan Island is northeast-southwest, about 3 kilometers long, and the short axis is northwest-southeast, about 18 kilometers long, covering an area of about 35,4 square kilometers. It is the second largest island in China after Taiwan Province Island.

Hainan Island is separated from the Qiongzhou Strait in the north and faces Leizhou Peninsula. Qiongzhou Strait, which is about 3 kilometers wide, is a maritime "corridor" between Hainan Island and Chinese mainland, and also a shipping channel between Beibu Gulf and South China Sea. Because of its proximity to the mainland, and the majestic mountains and towering fingers on the island, Hainan Island is faintly visible when the weather is clear and there are no clouds in Wan Li, standing on the southern coast of Leizhou Peninsula.

in the spatial distribution, the geological structure forms of Hainan Island form the main structural systems such as east-west structure, north-south structure, northeast structure and northwest structure with various structural combinations in different directions, traces and properties, and become the main structural framework of the land, which controls the island-land sedimentary construction, magmatic activity, mineralization and the distribution of mountains and rivers in the recent period. ?

The deep geological structure of Hainan Island is a depression area on the background of mantle uplift, with the center of mantle depression from Qiongzhong to Ledong, and the depth of mantle depression is more than 3 kilometers. Due to the differences between the crustal structure and deep structure in the island, there are many different characteristics in geological structure, sedimentary construction and magmatic activity.

Baidu Encyclopedia-Changhuajiang

Baidu Encyclopedia-Nandujiang

Baidu Encyclopedia-Wanquan River