The geographical environment of Wuxuan County

Wuxuan County is located at low latitudes, with the Tropic of Cancer crossing Tongling and Siling townships. It has a warm climate, abundant rainfall, and a subtropical climate zone. Since the terrain slopes from the northeast and southwest to the middle, forming an open area from northwest to southeast, and it is high in the northwest and low in the southeast, there is a barrier of Tiemao Mountain to the west, so when the cold air from the north moves southward, it usually passes through two routes. Enter the county. All the way is through Liuzhou and along the Liuwu Highway. Due to the terrain of high in the northwest and low in the southeast, the cold air slides, which is not conducive to the occurrence and development of precipitation. Therefore, after the cold air reaches Wuxuan, most of the rainfall is little or no rainfall. After entering Laibin County via the Hunan-Guangxi Line, it is guided by high-altitude airflow and enters the southern part of Luxin and Wuxuan along the open areas of Laibin, Nansi, and Shiya. The cold air along this road also slides through the high to low terrain, which also affects precipitation. In the eastern part of the county, except where the Qianjiang River comes from, there are mostly higher mountains, especially Dayao Mountain, which form a barrier to the easterly weather system. At this time, Wuxuan County is on the leeward slope of the southeast monsoon in summer, and the rainfall is greatly reduced. To the south, Jinxiu Luoxiang The annual rainfall is more than 2,500 mm, while the annual rainfall in Wuxuan and Huangmao on the leeward side is only 1,160 mm. The difference is huge. Due to the influence of topography, precipitation in Wuxuan mainly comes from high-altitude troughs, low vortices, thermal low pressures coming from the west and south (they sometimes cooperate with surface fronts), and the typhoon edge or typhoon trough or strong tropical waves entering the Beibu Gulf. Except for the rainfall path of tropical storm waves, which is from east to west, most weather systems in the summer half of the year are from Tongwan (or Siling) along the long opening basin through Tongling (Luxin) to Sanli, Dongxiang, and Wuxuan. , Ertang, and Huangmao are uplifted by the remaining veins of Dayao Mountain, resulting in increased rainfall, making the eastern part of the county receive more rainfall than the western part. In the winter half of the year, they go from Huangmao and Ertang to Sanli and Dongxiang via Wuxuan, or from Luxin to the south of the county.

In addition to affecting atmospheric circulation and precipitation, mountains also have a great impact on the distribution of light and heat. The mountainous areas in the eastern part of the county are mostly mountains and ridges running from the northeast to the southwest. They have higher forest coverage and higher altitudes, so they have less sunlight, more rainfall, high humidity, and low temperatures. In the west, there are many isolated peaks and rocky mountains, with few trees, more sunshine, high intensity, high temperature, less rainfall and high evaporation, making it a dry area. The climate characteristics of Wuxuan County are as follows: abundant light and heat, but often low temperatures in spring and autumn; abundant rainfall, but uneven distribution, and frequent droughts; water and heat in the same season, with occasional floods; winter temperatures are relatively high, with occasional frost and snow. Wuxuan County has 106 large, medium and small rivers, with a river network density of 0.3 kilometers per square kilometer. The county's total annual water volume is 1.270 billion cubic meters, including 1.144 billion cubic meters of surface water and 126 million cubic meters of groundwater.

There are 6 underground rivers and 154 large underground water outlets in the county. The maximum outlet flow of the underground river reaches 891 liters per second, and the dynamic storage capacity of groundwater during the dry period is 7079.6 liters per second.