What is the geographical environment of Jinhua City?

Jinhua, located in the east of Jinqu Basin, is a hilly basin in the middle of Zhejiang, with high terrain in the north and south and low terrain in the middle. "Surrounded by mountains on three sides, with a river in the middle and three rivers scattered in the basin" is the basic feature of Jinhua landform. There are Panda Mountain and Huiji Mountain in the east and northeast of the city, Xianxialing in the south, Longmen Mountain and Qianligang Mountain in the north and northwest. There are relatively gentle hills scattered in the mountains, which are divided into northern hills and central hills by the Jiangshan-Shaoxing fault zone. The central part is dominated by the eastern part of Jinqu Basin, and it is surrounded by small intermountain basins such as Wuyi Basin and Yongkang Basin. The whole great basin is roughly northeast-southwest, opening to the west. From the periphery of the basin to the center of the basin, it presents the characteristics of stepped and layered distribution of mountains, hills and valleys. The bottom of the basin is a broad alluvial plain with low and flat terrain. The upstream Dongyang River flows through Dongyang, Yiwu and Jindong from east to west, and then merges with Wuyi River to form Jinhua River, and flows northward into Lanjiang River in Lanxi City. Lanjiangbei flows to Jiangjunyan and enters Jiande City. Jiangjunyan is 22 meters above sea level, which is the lowest point in Jinhua.

There are 208 peaks above dry meters in the territory. Located at the junction of Wuyi and Suichang, the main peak of Niutou Mountain is 1560.2 meters above sea level, which is the highest peak in Jinhua city. The mountainous areas in the territory are mainly low mountains of 500- 1000 meters, which are distributed on the north and south sides.

There are Panda Mountain and Huiji Mountain in the east and northeast of Jinhua, Xianxialing Mountain in the south, Longmen Mountain and Ganligang Mountain in the north and northwest. Xianxialing Mountain Range extends from Wuyi Mountain at the junction of Fujian and Jiangxi to Wuyi County, southern Wucheng District and Yongkang City, and extends to the northeast as Panda Mountain and Tiantai Mountain Range. These mountains are mainly composed of volcanic rocks and granite. Pan Da is the source and watershed of Qiantang River, Caoejiang River, Jiaojiang River and Oujiang River.

Huiji Mountain is a branch of Tiantai Mountain, with its main body extending to the northeast and southwest to the north of Dongyang and Yiwu. This mountain is mainly composed of volcanic lava and clastic rocks. Dongbai Mountain, the main peak, is located at the junction of Dongyang, Zhuji and Shengzhou. Longmen Mountain is located between Fuchunjiang River and puyang river, distributed in Pujiang, Wucheng District, the northern part of Jindong District, Lanxi and the western edge of Yiwu. The mountain is mainly composed of Mesozoic volcanic lava and clastic rocks, with granite and limestone in some areas. The rest of the veins in Jin Huashan are massive mountains, and the wharf basin in the north is connected with Longmen Mountain.

Qianligang Mountain Range extends from Huaiyu Mountain Range in the northeast of Jiangxi to the junction of Lanxi and jiande city. The mountain is composed of sedimentary clastic rocks, with Ganligang sandstone in the middle. The mountain system extending into China is controlled by Cathaysian structure, and most of them are northeast-southwest trending. At the same time, it is cut by the northeast-southwest and east-west fault zones, and many branches extending outward crisscross, with broken mountains and staggered peaks.

Jinhua has a subtropical monsoon climate. The general characteristics are four distinct seasons, moderate annual temperature, abundant heat and rainfall, and obvious dry and wet seasons. In spring, the temperature rises rapidly, but the temperature changes irregularly. Rain is concentrated in late spring and early summer, with hail and strong winds. Summer is long and hot, rain and heat rise synchronously, often accompanied by drought; Autumn is cool, the air is humid and the time is short; Winter is sunny, cold and dry, and the atmospheric stratification is stable. The overall light and heat conditions are superior throughout the year, but the spatial and temporal distribution is uneven. There are various microclimates in the basin with certain vertical differences. Due to the instability of monsoon climate, severe weather such as drought and flood occurs frequently.

The annual average temperature in Jinhua City shows a "~" curve change, especially since the late 1980s, with an obvious upward trend. For example, the annual average temperature in Jinhua is 17.5℃, 1984 is 16.6℃, and in 2005 it was 18.2℃. 20 12 annual average temperature 16.7℃ (Pujiang) ~ 18.2℃ (Yongkang), which is 0. 1 ~ 0.3℃ higher in Jinhua, Dongyang and Yongkang and 0.1~ 0.3℃ lower in other areas.

Jinhua is rich in annual rainfall, but the seasonal, interannual and regional changes of rainfall are great. The distribution of seasonal rainfall is unimodal, with more spring rain, more plum rain and less rainfall in summer, autumn and winter. The average annual total rainfall in Jinhua is 1.424mm, and the rainfall fluctuates within the range of plus or minus 20% in most years. The maximum rainfall year is 19 19 18mm, and the minimum rainfall year is 1978963mm. ..