Location is produced

Neijiang city is located in the southeast of sichuan basin, tuojiang downstream middle section. It connects chongqing in the east, chengdu in the west, zigong, yibin and luzhou in the south, ziyang and suining in the north. Location east longitude 104 ° 15 '- 105 ° 26', north latitude 30 ° 29 ° 11 '- 2'. The city covers an area of 5,385 square kilometers. It is 121.5 km long from east to west and 94.7 km wide from south to north.

topography
In jiangxi province by longquan mountains, the east by HuaYingShan vein, gently topography, shallow high PingBa alternate with, and nanchong, deyang, zigong hilly-gully region of upper hills siltstones. Neijiang stuff maximum span 121.5 km, north and south the largest span 94.7 km, is a typical sichuan hilly topography, the average altitude of 300 m ─ ─ 500 m, the development of river network is poor, insufficient soil show. The two mother mountains are 834m above sea level, which is the highest point of the neijiang river and the watershed between qingxi river flowing to the tuojiang river system and yuanxi river flowing to the minjiang river system.

Baiyun mountain is known as the "sichuan small and medium-sized green city", there are 108 mountains, peaks pinnacle, continuous ups and downs, up and down the forest, the vast forest, deep valleys crisscrossed, cliffs everywhere. The highest peak is 733m above sea level, with a relative height difference of 430m.


The climate characteristics
Neijiang city is a subtropical humid monsoon climate. Affected by basin and local natural environment, it has the characteristics of mild climate, abundant rainfall, sufficient light and heat, and long frost-free period. Warm winter and hot summer, moderate rainfall. Average temperature of 15 ° C - 28 ° C, the average temperature of 6 ° C - 8 ° C, July mean temperature 26 ° C - 28 ° C, the highest temperature can reach 41 ° C, the lowest temperature of 5.4 ° C, active accumulated temperature of around 5598 ° C. The annual average solar radiation is 89.6 kcal/km2. The annual total sunshine hours range from 1100 to 1300 hours. The frost-free period lasts for 330 days. The number of frost days throughout the year is generally about 4-8 days. Severe weather is mainly drought, drought and flood interlaced; In spring, summer, autumn and winter, low temperature, wind and rainstorm occur from time to time. Annual temperature has obvious phenomenon of winter and spring drought, at the same time, the phenomenon of summer and summer drought. History has a "ten years a drought, five years a small drought, three years two drought, flower drought every year." The annual relative temperature is about 80%. Annual rainfall of 1000 mm or so, mostly distributed in summer, about 60% of the annual rainfall, high temperature period and rainy season is basically the same, about 17% in spring, winter only accounted for 4%.

The main climate in 2014 was slightly different from previous years. 17.4 ~ 28.1 ℃, annual average temperatures in most places the same period a year high of 0.1 ~ 0.3 ℃. During the year, the highest and lowest temperature in large area, 40.0 ℃ and 0.8 ℃ respectively. In mid-april the temperature on the high side, high 4.0 ~ 4.6 ℃, from the same period a year zizhong, weiyuan came second in the historical highs. The annual precipitation is 927.8 ~ 1188.5mm, which is 2% ~ 18% more than the same period of previous years in most places, and the spatial and temporal distribution is uneven. The precipitation in January is only 0.7-3.6mm, 75% ~ 92% less than the same period of previous years. The precipitation during the main flood season from June to August is 412.7 mm to 596.9mm, 21 ~ 25% less than the same period in previous years. From February to April and from September to November, there were more of them, especially in September, 48 to 153% more than in the previous year. The annual sunshine hours were 871.1 ~ 1102.1 hours, of which zizhong county and longchang county were 1% and 12% more than others, and weiyuan county and dongxing district were 15% and 21% less than others. In June and September, the number of cloudy and rainy days was significantly less than 50 ~ 60%.

Hydrological characteristics
Tuojiang river is the main river in the urban area, flowing through zizhong, dongxing and shizhong district, is the urban waterway transportation, since ancient times, "dendrobium boat if the wind" busy scene description. Tuojiang river water flow gently alternating, beach tuo phase, winding, annual average flow rate of 375 cubic meters/second, natural drop of 135.5 meters, the average ratio of 0.45%, water energy reserves of 145,000 kw for development. The larger tributaries include the qiuxi river in zizhong and daqing river in neijiang. These rivers provide irrigation, shipping and electricity. With the water energy resources of tuojiang river, the annual power generation can reach 920 million KWH, and the water energy resources developed now only account for 21.7% of the exploitable amount.

Qingliu river is divided into large qingliu river and small qingliu river. Big rivers and a clean small clean river in stones into called the clean river, total length of 121.74 km (neijiang river, 94 km), the basin area 1538.3 k ㎡ (523 k ㎡ neijiang river). Small QingLongHe after rectification, taian, in small river into the tuojiang river, 56 km, the basin area of 532 k ㎡.