Geography of lingchuan county
There are frequent cold air activities in spring (February-April), often with low temperature, rainy weather and even cold weather in late spring. In most years, insufficient rainfall during early rice transplanting leads to spring drought, and local hail often occurs in late spring. The temperature is high in summer (May to August). From July to mid-August, the average daily temperature is above 25℃, and the highest is above 35℃, which is the hottest period in a year, and the concentrated rainfall accounts for 60% of the total annual rainfall. From July to mid-August, heavy rains and strong winds occurred frequently, and there was a great flood in this period in history. In autumn (September-165438+1October), the weather is crisp, the temperature drops gradually, and the rainfall decreases obviously. In June+10/October, 5438, cold dew and windy weather often appeared, and autumn drought was easy to occur after the rainy season. In winter (12-65438+ next year1October), the rainfall is small, accounting for only 5% of the annual rainfall, and the climate is mild, with the temperature above 10℃ and occasional frost. Rivers in the county belong to the Pearl River and the Yangtze River, mainly in the Pearl River Basin. According to the data of agricultural regionalization, its watershed area is 2 178.29 square kilometers, accounting for 96.28% of the county's total area; The Yangtze River basin is 83.9 square kilometers, accounting for 3.72%. The Lijiang River runs through the north and south. It is a first-class tributary of the Xijiang River in Guangxi and the largest river in the county. There are many tributaries of Lijiang River, with branches distributed on the east and west sides. River source and riverbed are mostly rocks, pebbles and fine sand, so its water color is crystal clear. Ocean River belongs to the Yangtze River basin and flows from the northeast of the county seat to Xing 'an county seat. Most rivers in China originate from Haiyang Mountain and Yuechengling on the east and west sides, and there are 66 rivers, with rainfall collection area of 10 square kilometers. Besides Lijiang River and Haiyang River, there are 14 first-class tributaries, 3 1 second-class tributaries, 16 third-class tributaries and 3 fourth-class tributaries. The total length of rivers in the county is 795.7 1km, and the density of river network is 0.35km/km2. There are 9 rivers 19 with an accumulated rainfall area of over 50 square kilometers in the county, with a total length of 5 13.2 kilometers and a river network density of 0.265 km/square kilometer. There are 9 in the east and 9 in the west of Lijiang River.
Lijiang River is the upper reaches of Gui Jiang. Originated in the south slope of Laoshan boundary, the main peak of Yuechengling, xing an, with an altitude of1860m, and its upstream is called the Five Gui Jiang; Flowing southeast to Rongjiang Town, Linghe (the lower section of Lingqu) flows in from the left; The following reach is called Lijiang River. Enter Lingchuan in Xiaorongjiang Village. Lijiang River basin covers an area of 2 173.29 square kilometers. The total length is 45km, which is divided into two sections: the upper section is 33.5km, and the average width of the river surface is160m. Starting from Xiaorongjiang Village, it flows through Xiabei, Yantou, Sanjie, Fuqiudu, Dutou, Shuangtan, Cuijiawei and Sanchawei. It has collected Baiyun River, Lujiang River, Ganjiang River, Waterfall River, Sanyuanhe River and Gan Tang River, and flowed into Guilin from Qin Xia to Dadianwei. The lower section 1 1.5km, the average width of the river surface is 220m, and the river bottom is pebbles mixed with sand and silt. From Shanglijiao Village in Dawei Town to Nancun Village through Ganxing and Dawei Town, it flows southward to Qingshuitan, where it receives the water from the ancient cave and flows out of the suburbs of Guilin and Xiayangshuo County.
Gan Tang River, called Longyan River or Lingyan River in ancient times, is the largest tributary of Lijiang River in China. This river is 60 kilometers long with a total drainage area of 767.22 square kilometers. The main stream of Gan Tang River originates from the east slope of Dahushan in Caixi Street, with an altitude of 16 13m. The south flows through Bojitang, Longhuan, Menbu, Xiling, Shi Lei, Zhushanbao and Cao Huan, as well as Tuna Dahushan, Huangnijiang, Ronghuan, Nanshan, Lingmen, Niutang, Tingjiang, Maohou, Honghuan, Datang and Cao Huan. It was called Dongjiang in ancient times and Gan Tang River in the following. Turn east, go out of Qingshitan Canyon, pass through Jiuwu Village to Longyan, cross natural caves, cross Guanqiao, reach Jiangzhou and Nashe River, and then follow Dutan, Tanxia and Tiannan to Shizibu; Tuna Luzhu River and Lubao River, after crossing Gui Xiang Railway and Huang Gui Highway, cross to Xiangtan Village along Gan Tang, are assimilated, slope 2 water, turn south, flow through Sanpai and Dashu bottom, cross Nylon Dam to Sanchawei and then merge into Lijiang River. Exit elevation 145.438+0m. The total length of the main river channel is about 60 kilometers (including the submerged section of Qingshitan Reservoir). The average width of the Dongjiang section is 55m, and the Gan Tang section150m. There are many exposed sandy bedrock and boulders at the bottom of the river and above Qingshitan Canyon. The lower section is sand and pebbles, and there are many beaches.