Geographical environment of Tangjiawan town

Tangjiawan Town is relatively high in the west and southwest, low in the east and northeast, low in the southeast, and inclined from southwest to northeast. There are hills, terraces, alluvial plains, beaches and tidal flats. The high hills are the Phoenix Mountain system, with the highest peak at an altitude of 437 meters, and the rest are low hills and platforms, accounting for 53.9% of the land area, mainly composed of Yanshanian granite.

Granite in hills and terraces is mainly composed of sandy clay on the surface, mainly distributed in Yongfeng, Zhou Na, Huitong, Guantang and Downing.

Alluvial plains (including valley plains and valley plains) have sandy clay in the upper part and clayey gravel in the lower part, which are mainly distributed around rivers such as Guantang, Dong 'an, Shangzha, Zhou Na, Tangjia and Jishan.

Marine small plain (flat land composed of river alluvial and marine materials) is mainly composed of muddy sand and silty silt, which are distributed in Waisha, Liuzu, Tangjia, Jishan, Dong 'an and Qi 'ao.

The beach consists of coarse sand and fine sand, mainly distributed in outer sand, Shangzha, Guantang, Qianhuan, Houhuan, Qiao Housha Bay and Powan.

The soil of the beach is granite sandstone, which is distributed along the coast of Jishan. There are coarse sand and gravel, mainly distributed in Shangzha and Qi 'ao Jiazhou. There are fine sand and clay, which are mainly distributed in the outer sand, Shangzha, the east coast, the front ring, the back ring and the northern part of Qi 'ao Island. Tangjiawan Town is located in the south of the Tropic of Cancer and belongs to the subtropical maritime monsoon climate. Xia Dong has obvious monsoon alternation, with no severe cold in winter and no intense heat in summer. The annual average temperature is about 22.5℃. Tangjiawan Town is located in the north of Zhuhai, with low latitude, abundant sunshine and long sunshine time.

July-September is a hot period every year, in which the average monthly temperature in July is relatively high, reaching 28.6℃,1980 July 10 and the highest temperature of 38.5℃ was recorded twice in late July 2005. February to February in 65438 is a relatively cold month. The monthly average temperature is only 14.5℃,1976 65438+February 29th, and the temperature record is as low as 2.5℃. In spring, the daily average temperature is less than 12℃. In autumn, especially after 10 every year, the rainy season ends, the cold air begins to strengthen, and the dry season begins.

Tangjiawan area (according to meteorological statistics 1962- 1990), the annual rainfall is 2000-2200mm, and the rainfall is mostly concentrated from May to 10 every year. The month with the most rainfall over the years is June (average 19.4 days), accounting for 17% of the annual rainfall, and the month with the least rainfall is 12 (average only 3.9 days), accounting for only10.3% of the annual rainfall. There are heavy rains, heavy rains and heavy rains in May and June every year.