Geographical characteristics of Haikou city

Geography Haikou City is located at19 32'-20 05' north latitude and10'-11'east longitude. Located in the northern part of Hainan Island, bordering Qiongzhou Strait in the north, facing Hai 'an Town of Guangdong Province at 18 nautical mile; Wenchang city in the east; It borders Wenchang City and Ding 'an County in the south.

Haikou scenery (20 photos), adjacent to Chengmai County in the west. Haikou City starts from the old village of Dapo Town in the east and reaches Punan Village of Xixiu Town in the west, with a distance of 60.6 kilometers between the two ends; It starts from Wuchang Village, Dapo Town in the south and reaches the sea in the north, with a distance of 62.5 kilometers between the two ends. The land area of the city is 2304.84 square kilometers.

Haikou City is slightly longer, heart-shaped and flat. Nandujiang is the longest river in Hainan Island, passing through the center of Haikou. The eastern part of Nandu River is slightly inclined from south to north, and the western part of Nandu River is inclined from north to south. It is high in the northwest and southeast, low along Nandu River in the middle, and mostly coastal plains in the north. Except Ma 'anling in Shishan Town (222.2m above sea level), Jiuzhouling in Jiuzhou Town (199.9m), Riziling in Jiazi Town (17 1 m) and Leihuling in Yongxing Town (168.3m), the city is relatively high. Ma 'anling is the highest point in this city. The surface is mainly quaternary basic volcanic rocks and quaternary loose sediments, with a large distribution area. The coastal terrace landform is dominant, and the typical volcanic landform is dominant in the west. Urban landforms are basically divided into northern coastal plains, central areas along the Yangtze River, eastern and southern Taiwan Province areas, and western lava platform areas.

Climate Haikou City is located in the northern edge of the low latitude tropical zone, and belongs to the tropical maritime monsoon climate. It's warm in spring with little rain and much drought, hot and rainy in summer with many typhoons and rainstorms, cool and comfortable and rainy in autumn, and cold air coming in winter with chill. The sunshine time is long all year round, and the radiation energy is large. The annual average sunshine hours are more than 2000 hours, and the solar radiation can reach 1 1 to 120000 calories. The annual average temperature is 23.8℃, the highest average temperature is 28.6℃, and the lowest average temperature is 17.7℃. The highest extreme temperature is 38.7℃ and the lowest is 4.9℃. During April-June 5438+ 10, the temperature remained at a high level, and it was lower in June 5438+ 10. The annual average rainfall is 1.664 mm, the daily average rainfall is above 0.65,438+0 mm, and the rainy days are above 1.50 days. Rainfall is concentrated in summer, mainly hot thunderstorms in the afternoon, and occasionally typhoons approach or land, bringing heavy rain. The annual average evaporation is 1834 mm and the average relative humidity is 85%. Southeast wind and northeast wind predominate throughout the year, with south wind and southwest wind blowing mostly in early summer and midsummer, with an annual average wind speed of 3.4m/s. ..