Natural Resources of Dagang Reservoir in duchang county

Duchang county is located in the north of Jiangxi Province, with the east longitude of116 2 ′ 24 ″ to116 36 ′; 28 50' to 29 38' north latitude, with Wushan in the north and Poyang Lake in the south; Huang Jinshan, Yin Bao Lake, east of Dongzhou Bank, bordering Baiyang County; The southern boundary is Xia 'anzhou, Xiashan, Nan 'an and Broad Bean Island, bordering Boyang, Yugan, Nanchang and Xinjian counties. Songmen Mountain and Xihe River in the west face Yongxiu and Xing Zi counties across the sea. In the north, Feng Ping River, Lutang River, Wushan Egongtu, Xieyiling and Shuangjian Mountain are adjacent to Hukou and Pengze counties. The whole territory is 52.7 kilometers wide from east to west and 80 kilometers long from north to south. It covers an area of 2,669.53 square kilometers, accounting for about 1.6% of the whole province.

Duchang landform is dominated by hills and lakeside plains, with wide waters and low mountains in some areas. The terrain is high in the north and low in the south, with the Dagang-Mongkok fold uplift belt as the axis and inclined to the northwest and southeast. The highest point in the territory is Sanjiangyuan in the northeast, with an altitude of 647.3 meters, and the lowest point is Binhu District, which is only 10 meter. From northeast to southwest, it shows the trend of low mountains, high hills, low hills, plains and lakes. Duchang has a well-developed water system with numerous rivers and ports, including 39 large and small rivers and ports, with a total length of 359.6 kilometers. According to the flow direction, it can be roughly divided into seven major water systems: Dagang, Daxihu, Miaoxin Lake, Dayuan Lake, Zhoujiahu and Tuanzikou.

Duchang is located in the subtropical humid monsoon climate zone, influenced by Poyang Lake, with mild climate, abundant rainfall, abundant sunshine, sufficient heat, short ice age, long frost-free period, short spring and autumn season and long summer and winter. According to meteorological records, the first day of spring appears on March 24th on average (the first day when the daily average temperature passes 10℃ is beginning of spring), and the duration is about 65 days. The first day of summer appears on May 28th on average (the first day when the daily average temperature stably passes 22℃ is the first day of summer), and the duration is about 1 19 days. The average start date of autumn appears on September 24th (the day after the average daily temperature stably passes 22℃ is the start date of autumn), and the duration is about 59 days. The start date of winter appears on average at165438+1October 22nd (the day after the average daily temperature passes 10℃ is the start date of winter) and lasts about 122 days. At the turn of winter and spring, it is often hit by cold waves and the weather is changeable. At the turn of spring and summer, it is alternately controlled by cold and warm air masses, and it continues to be rainy and foggy in winter; At the turn of summer and autumn, the subtropical high stays for a long time, with sunny and hot weather and little rain. In autumn and winter, the cold air from the north invaded the south strongly, and the temperature plummeted and the frost was cold.