Caijiapo's natural conditions.

Caijiapo has a warm temperate monsoon semi-humid climate with four distinct seasons: cold, warm, dry and wet.

In spring (March-May), precipitation increases, cold air activities are frequent, and the daily temperature difference is large, which is prone to cold wave, strong wind, frost and spring drought. In summer (June-August), the temperature is the highest, the precipitation is the largest, and the sunshine is sufficient. However, due to the differences in topography and thermal effects, precipitation is unevenly distributed, with more dry and rainy days in early summer and frequent gale, rainstorm and hail in later period. In autumn (September to165438+1October), it is rainy in early autumn, the temperature drops slowly, the humidity is high, the light is weakened, and the air is high in the later period. In winter (65438+February to February of the following year), the climate is cold, dry and rainy.

1. temperature

The annual average temperature is 12℃, the hottest month is July, the average temperature of the hottest month is 25. 1℃, the average temperature of Leng Yue is 1℃, and the average temperature of Leng Yue is-1.7℃.

2. Humidity

The annual average relative humidity is 765438 0%.

3. sunshine

The annual sunshine time is 2049. 1 hour.

4. Wind direction

The dominant wind direction is east wind, and the secondary wind direction is west wind. The annual maximum wind speed is 24m/s.

5. Rain and snow weather

The maximum rainfall in recent 10 years 128.4 mm, lasting for 7 days, and the average annual rainfall is 611.1mm; The maximum snowfall in recent 10 years/kloc-0.1mm, lasting for 5 days, and the annual average snowfall17.8 mm. ..

6. Annual freezing period and soil freezing depth

The annual freezing period is 49 days, and the maximum depth of soil freezing period is 34 cm. The Weihe River starts from Laobaozi Village in caijiapo in the west and ends in taoyuan village in the east, with a total length of 9.6 kilometers. The annual transit flow is 3.986 billion cubic meters, the average flow is 126.39 cubic meters per second, and the annual self-produced runoff in China is 4.84 million cubic meters. According to the actual measurement of Weijiabao Hydrological Station 1954, the maximum flood peak is 5780 cubic meters per second; The sediment concentration is relatively large, with an average sediment concentration of 65.2 kg per cubic meter. The natural ratio of riverbed decreased to1.1.29 ~1.689%, and the water volume became worse. The river bed has been raised in recent years.

Shitou River belongs to the first-class tributary of Weihe River, which starts from the east side of Heping Village in the south and flows into Weihe River in the north, with a length of 15.438+0 km. The annual transit flow is 46 1 100 million cubic meters, and the average flow is 14.438+0 cubic meters per second. The annual self-produced runoff in the territory is 24.48 million cubic meters, with an average flow of 0.78 cubic meters per second. The riverbed gradient is 20%, and the current is fast.

Maili River originates from the shallow mountainous area of Qinling Mountain in Caojia Community and flows northward into Weihe River, with a total length of 13km, an annual runoff of15.5 million cubic meters and an average flow of 0.49 cubic meters per second. Tongyu River originates from Wei Yuan ditch in Caojia community and flows into Weihe River along the northwest of Caojia community and Wuzhangyuan community, with a total length of 3.5 kilometers, annual runoff of 318500 cubic meters and average flow of 0. 1 cubic meter/second. The groundwater in caijiapo area is mainly supplied by rivers and atmospheric precipitation, with good hydrogeological conditions, and the diving depth is less than 80 meters. The aquifer is mainly composed of sand, gravel and pebbles with uniform lithology, coarse particles and good water permeability. The single water inflow is 60-200m3 /h, and the aquifer permeability coefficient is 5m/d ... The first and second terraces on both sides of Weihe River have a groundwater depth of less than 50m and a thickness of more than 40m. The buried depth of water level is generally 1 ~ 15m, and the water yield of a single well is 60t/h, so artesian wells can be drilled in caijiapo area. Shitou River terrace, groundwater is replenished by Shitou River and atmospheric precipitation. Due to the closure of Xieyuguan Reservoir in the upper reaches of Shitou River, the phreatic water is greatly reduced during drought, while the confined water is rich, generally less than 40 meters deep and about 30 meters thick. The water level is 3 ~ 10 meter, and the water output of a single well is 60 tons/hour. Shuihe terrace is rich in phreatic water and confined water, with a buried depth of 50m, a thickness of 30m, a buried depth of 2- 15m and a single well water yield of 40t/h. ..

There are many springs in caijiapo, which are mainly distributed in the original rivers, such as:

Pearl Spring is located in Nanshetou Village. The spring water is shaped like beads from bottom to top, hence the name. The pond with a spring surface of about 100 square meter is crystal clear and has a water outlet in the south, which can irrigate more than 200 mu of farmland.

Old Longquan is located on the half slope of the living area of Northwest Machinery Factory. The spring mouth is about 3 meters in diameter, surrounded by railings, and the water quality is good.