The Nandu River ( Chinese : 南渡江 ) is the longest river in Hainan Province, China. Its tributary is the Xinwu River . The river discharges into the Nandu River estuary at Haikou city, and then into Qiongzhou Strait .
20-675: The river is 314 km long, with a discharge of 6.099 billion cubic metres. It passes the major settlements of Chengmai Zhen in Chengmai County then Dingcheng in Ding'an County . The river then turns north, goes over the Longtang Dam at Longtang , a somewhat smaller town than Chengmai and Ding'an. The Nandu then goes under several bridges, such as the Nandu River Iron Bridge and Qiongzhou Bridge . Once passed
40-428: A large part, with the county possessing 89.8 km (55.8 mi) of coastline. Apart from farm fishing, marine catches include mackerel , redfish , croaker fish , grouper , pomfret , tuna , squid , cuttlefish , lobster and shrimp , are fished in the harbour at Tu Beach. The diverse and populous fish are a result of a nutrient-rich sediment at the bottom of the harbour. The Han people account for 99.5% of
60-464: A tropical monsoon climate or have more pronounced dry season(s). It is impossible for a tropical savanna climate to have more than 2,500 mm (98 in) as such would result in a negative value in that equation. In tropical savanna climates, the dry season can become severe, and often drought conditions prevail during the course of the year. Tropical savanna climates often feature tree-studded grasslands due to its dryness, rather than thick jungle. It
80-545: Is mining , with more than ten resources available within the county including quartz , stone , limestone , crystals , gold , silver , peat , zinc , aluminium , iron ore , kaolin , and manganese . Over 5 billion tonnes of quartz are still unmined in the county, with an average grade of 99.5% silicon . There are also nearly 11 million tonnes of limestone remaining in addition to crystal deposits 5.5 km (3.4 mi) long and 3 km (1.9 mi) wide and around 80,000,000 tonnes of kaolin . Fishing also makes up
100-494: Is 23.7 °C (74.7 °F). With a total land area of 206.7 km (79.8 sq mi), melons and other tropical crops are grown around the county. More than 20 rivers flow through the county, providing 17.4 × 10 ^ m (610 × 10 ^ cu ft) of water per year. The main settlement in the county is Jinjiang. It is located directly on the north side of the Nandu River and essentially occupies
120-400: Is 56 km (35 mi) wide (east to west) and 70 km (43 mi) long (north to south). It has a total land area of 2,067.6 km (798.3 sq mi). Climate-wise, it is tropical with ample sunshine and moderate rainfall all year round; on average, the county receives 2060.5 hours of sunshine and 1,756 mm (69.1 in) of rain each year. The average annual temperature
140-584: Is a county in Hainan , China. It is one of four counties of Hainan. Its postal code is 571900. In 2002, its population was 490,800. The first record of Chengmai County is in 110 BC, when it referred to as Guo County in one of Emperor Wu of Han 's records. The county acquired its current name under the Sui dynasty reorganisation of 607. It was also recorded during the Ming dynasty . Located in northwest Hainan , it
160-534: Is a tropical climate sub-type that corresponds to the Köppen climate classification categories Aw (for a dry "winter") and As (for a dry "summer"). The driest month has less than 60 mm (2.4 in) of precipitation and also less than 100 − ( Total Annual Precipitation (mm) 25 ) {\textstyle 100-\left({\frac {\text{Total Annual Precipitation (mm)}}{25}}\right)} mm of precipitation. This latter fact
180-588: Is also prevalent in sections of northern Australia , the Pacific Islands, in extreme southern North America in south Florida , and some islands in the Caribbean . Most places that have this climate are found at the outer margins of the tropical zone , but occasionally an inner-tropical location (e.g., San Marcos , Antioquia , Colombia ) also qualifies. Similarly, the Caribbean coast, eastward from
200-445: Is in a direct contrast to a tropical monsoon climate , whose driest month sees less than 60 mm (2.4 in) of precipitation but has more than 100 − ( Total Annual Precipitation (mm) 25 ) {\textstyle 100-\left({\frac {\text{Total Annual Precipitation (mm)}}{25}}\right)} of precipitation. In essence, a tropical savanna climate tends to either see less overall rainfall than
220-403: Is the case East Africa (Mombasa, Kenya, Somalia), Sri Lanka ( Trincomalee ) and coastal regions of Northeastern Brazil (from São Luís through Natal to Maceió ), for instance. The difference between "summer" and "winter" in such tropical locations is usually so slight that a distinction between an As and Aw climate is trivial. In most places that have tropical wet and dry climates, however,
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#1732772001986240-560: Is this widespread occurrence of tall, coarse grass (called savanna) which has led to Aw and As climates often being referred to as the tropical savanna. However, there is some doubt whether tropical grasslands are climatically induced. Additionally, pure savannas, without trees, are the exception rather than the rule. There are generally four types of tropical savanna climates: Tropical savanna climates are most commonly found in Africa , Asia , Central America , and South America . The climate
260-428: Is used in place of Aw if the dry season occurs during the time of higher sun and longer days. This is typically due to a rain shadow effect that cuts off ITCZ-triggered summer precipitation in a tropical area while winter precipitation remains sufficient to preclude a hot semi-arid climate ( BSh ) and temperatures in the summer months are warm enough to preclude a Mediterranean climate ( Csa/Csb ) classification. This
280-930: The Gulf of Urabá on the Colombia – Panamá border to the Orinoco river delta , on the Atlantic Ocean (ca. 4,000 km (2,485 mi)), have long dry periods (the extreme is the BSh climate (see below), characterized by very low, unreliable precipitation, present, for instance, in extensive areas in the Guajira , and Coro, western Venezuela, the northernmost peninsulas in South America, which receive <300 mm (11.8 in) total annual precipitation, practically all in two or three months). This condition extends to
300-677: The Lesser Antilles and Greater Antilles forming the Circumcaribbean dry belt. The length and severity of the dry season diminishes inland (southward); at the latitude of the Amazon river—which flows eastward, just south of the equatorial line—the climate is Af. East from the Andes, between the arid Caribbean and the ever-wet Amazon, are the Orinoco river Llanos or savannas , from where this climate takes its name. Sometimes As
320-716: The Qiongzhou Bridge, at the southern tip of Xinbu Island , the Nandu flows north along the east side of Xinbu Island and out into the sea. At the southern tip of Xinbu Island, two distributaries branch off. One is the Henggouhe Channel which runs along the west side of Xinbu Island. The other is the smaller Haidian River which flows westward, under the Haikou Century Bridge , and out into Haikou Bay . From Chengmai Zhen in Chengmai County at
340-675: The population of the county. The people of Chengmai County live to an average of 77.79 years. Among the population are 215 centenarians . The proportion of centenarians compared to the rest of the county's population, and the overall number, ranks highest of all cities and counties in China. Of the total 565,000 people living in the county, 18,500 are more than 80 years old, 896 of which are couples. 19°45′07″N 110°00′58″E / 19.752°N 110.016°E / 19.752; 110.016 Tropical wet and dry climate Tropical savanna climate or tropical wet and dry climate
360-457: The south face of a large hill. The old section is located by the river with newer buildings further up. The backside of the hill is currently under development with mostly high-rise apartments being built. Many government buildings are situated on the top of the hill. Near the centre of the hill, there is a large park. Chengmai a tropical wet and dry climate ( Köppen Aw ). Bordering a tropical monsoon climate ( Köppen Am ) The main industry
380-776: The west bank near Dingcheng . One instance of flooding occurred at a sharp bend in the river at Bushicun village. There in August 2016, on the outside bend, as it had before, water surged and flooded onto the land. The ground there, several metres above normal river level, is strewn with rusted boat hulls from previous floods. 19°49′15″N 110°23′45″W / 19.8207°N 110.3957°W / 19.8207; -110.3957 19°59′52″N 110°23′08″E / 19.9979°N 110.3856°E / 19.9979; 110.3856 Chengmai County Chengmai County ( postal : Tsingmai; simplified Chinese : 澄迈县 ; traditional Chinese : 澄邁縣 ; pinyin : Chéngmài Xiàn )
400-586: The west to its mouth at Haikou there are numerous bridges crossing the Nandu River. Some are semi-permanent and get washed out during times of high water, while other, major bridges are currently under construction. The following is a fairly comprehensive list of landmarks and bridges between Chengmai Zhen and Haikou City. The Nandu occasionally floods its banks. For that reason, preventative measures have been taken. For example, near Haikou and in other parts, levees were built, and flood walls were constructed on
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