Brief introduction of three major rivers in Hainan

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

1, Nandujiang is rich in water resources and has a large flow. There are obvious dry and wet seasons and heavy rains in the basin climate, so the river flow and water level often rise and fall sharply. After each rainstorm, flash floods and river surges can reach the maximum flood peak immediately. River water level has two peaks in a year, one in May and the other in September and June, 10.

Songtao Reservoir was built in the upper reaches of Nandu River 196 1, with a storage capacity of 3 1 100 million cubic meters. It has the benefits of flood control, irrigation and power generation, and plays an important role in overcoming unstable flow. The river bed gradient in Nandujiang Delta is small, and the channel siltation is fast. During the typhoon and rainstorm in summer and autumn, the tide flows backwards, and sometimes floods occur.

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

The main stream of Changhua River is 232 kilometers long, with a drainage area of 5 150 square kilometers and a total drop of 1.270 meters. Changhua County of 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, originating from Wuzhishan, with a total length of 163km and a drainage area of 3,693km2. The typical tropical rainforest landscape and ingenious landforms along the banks of the river are breathtaking. Wanquan River is an unpolluted tropical river in China, with beautiful ecological environment, and is known as the "Amazon River" in China.

Extended data:

Seen from the plane, Hainan Island looks like an oval Sydney, located in the blue sea. The major axis of Hainan Island is about 300 kilometers from northeast to southwest, and the minor axis is about 180 kilometers from northwest to southeast, covering an area of about 35,400 square kilometers. It is the second largest island in China after Taiwan Province Province.

Hainan Island is separated from Qiongzhou Strait in the north and faces Leizhou Peninsula. Qiongzhou Strait, about 30 kilometers wide, is a maritime "corridor" between Hainan Island and Chinese mainland, and also a shipping channel between Beibu Gulf and South China Sea. Due to its proximity to the mainland, 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.

In spatial distribution, the geological structure of Hainan Island has formed a main structural system with various directions, tracks and properties, such as east-west, north-south, northeast and northwest, which has become the main structural pattern of the land and controlled the recent island-land sedimentary construction, magmatic activity, mineralization and the distribution of mountains and rivers. ?

The deep geological structure of Hainan Island is a depression area under the background of mantle uplift. The center of mantle depression is from Qiongzhong to Ledong, and the depth of mantle depression is more than 30 kilometers. Due to the differences in crustal structure and deep structure, the island has many different characteristics in geological structure, sedimentary formation and magmatic activity.

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