Fuzhou World Bank Financed Projects Nanjiang Binlu, Phase-ii project of the Third Ring Road and Kuiqi Bridge environmental impact report
Overview of Natural and Social Environments Along the Project Line
Download 3.93 Mb.
|
- Navigate this page:
- 3.1.2Landforms and Topography
- 3.1.3Stratigraphic geology
- 3.1.4Climate and meteorology
- 3.1.5River hydrology
- 3.1.6Underground water
- 3.1.7Soil
3Overview of Natural and Social Environments Along the Project Line3.1Natural Environment3.1.1Natural geographic overviewFuzhou Nanjiang Binlu is positioned at the north of Nantaidao Island, close to the Minjiang River. It starts from the pile No.0+000 on Cangqian Xilu and ends at pile No.9+000 at proposed Kuiqi Bridge. Refer to Fig. 3.1-1 and 3.1-2 for concrete positions. Nantaidao Island is surrounded by rivers, at the east longitude of 119o13′12″～119o25′48″ and the north latitude of 25o57′48～″26o6′42″. The total area is 142km2. It enjoys a subtropical monsoon climate, mild climate and plentiful rainfall. Rainfall and hot weather are in the same period of time of the year. According to meteorological data, Fuzhou’s average annual temperature is 19.6℃ for years. Years’ change is between 19.1℃ and 20.3℃. The highest monthly temperature is 28.8℃ in July. The extremely highest temperature is 39.5℃. The coldest month is January with a temperature of 6.9℃. The extremely lowest temperature is -2.3℃. The average annual rainfall is 1000～1500mm. The largest rainfall is in May and June, approximately accounting for 33％ of the year. The smallest rainfall is in November. From May to September is a season of plum rains, typhoon and rainstorms, the rainfall accounts for 47～83% of the year. The annual sunshine is up to 1700～1980 hours. The total annual solar radiation is up to 4100～4600mega joule/m2. The primary wind direction of the year is southeast wind and frequency is 14.3％; the secondary wind direction of the year is south wind in summer and west wind in winter. The average annual wind velocity is 2.9m/s and the maximum wind velocity is 31.7m/s. Rainfall distribution at the Minjiang River valley basically increases from the southeast to the northwest. From April to September of the year is the flood season of the Minjiang River, the rainfall accounts for 69～77％ of the year. Fuzhou enjoys a mild maritime climate and plentiful rainfall. The maximum annual rainfall is 1633mm and the minimum rainfall is 1006mm, with an average annual rainfall of 1343mm. Rainfall concentrates in April to June. August and September are typhoon season with thunderstorms. 3.1.2Landforms and TopographyNanjiang Binlu and the Phase-II Project of the Third Ring Road are all on the Nantaidao Island, and the southwest bridgehead of Kuiqi Bridge is also positioned on the island. Topography of Nantaidao Island mainly features hills and plain, with a sea level of lower than 250m. Land surface doesn’t have much relief, but featuring a “three-high and two-low”. The northwest part, middle and southeast part of the island are mainly hilly areas. The famous Gaogaishan, Changanshan and Yantaishan ridges run through the middle and north areas. The highest hill in the central part is Gaogaishan with a seal level of 202m. Among the three big hills is mainly a plain. The southeast part is a broad alluvial plain. The whole surface relief tilts from the northwest to the southeast. The main topography of Nantaidao Island is hills, plain and river flood land. The hilly land features forest, bushes or wasteland. On the plain are orchard and vegetable plots. Nantaidao Island geology consists of hill slope and alluvial plain. Hills account for about 65% and plain accounts for 35%. Rocks and hills expose. There are Jurassic Nanyuan volcanic rocks, late Yeshan fine granodiorite, and red middle grain granitite with vein materials. Hills are mainly composed of granite, then volcanic rocks and alluvium, where there are forests and fruit trees. Plain is the Longhai group alluvium of the Quaternary System Pleistocene Epoch and Holocene Epoch Changle group marine accumulation and alluvial deposit, which are composed of fine sand, dust and clay. It is an area to grow crops, vegetables, fruits, trees and flowers. Project is proposed to be built on the top of the Quaternary geology composed of different rock formation (including alluvium, flood wash, marine accumulation, marine and land transit and drift bed). Underground is weathered granite. There is locally exposed granite scattered with other possible dikes. Some sections along the road line have shallow-buried sludge layers. There are no high hills, steep slope, border slope, dislocated and fractured zone and earthquake fault zone. Nanjiang Binlu is positioned on the south bank of Minjiang Beigang of Nantaidao Island of Fuzhou. It starts from Cangqian Xilu in the west and ends at the proposed Kuiqi Bridge in the east. The road will cross the old alluvial area of the Minjiang River and the old river channel mud alluvium, Cangshan relic slope and Cangnan mud alluvial area. The engineering geological conditions at the relic slope area are good, but engineering geological conditions at highly compressed sludge, shallow buried sludge and alluvial area are poor. The geology and landform along the Phase-II Project of the Third Ring Road are divided into two sections on the basis of Fuxialu boundary. The starting point is from the north bridgehead of Wanbian Bridge of Fuxialu section. It passes through Nantaidao Island. Beside part of residences, most of it is on the farmland, vegetable plot and orchard. Along the line is relatively smooth alluvial plain. Except part of the starting point is at the small slope with an elevation between 8.0 and 15.0; the rest of it is between 4.3 and 8.0. From Fuxialu to the terminal are hills, vegetable plot, orchard and requisitioned land. The highest elevation of the hilly section is up to 48.8, the land surface of the vegetable plot, orchard and other requisitioned land is smooth, and most of them have an elevation between 5.4 and 5.7. Kuiqi Bridge crosses the Minjiang River whose north bank is positioned at Fuzhou Gushan ridge, connecting with the highway of the Changle International Airport; the south bank is at the terminal point of the Phase-II Project of the Third Ring Road. The landform where the bridge is is high in the northeast and low in the southwest, it decreases in an elevated mode. The middle coastal part has low hills and Taiwan Strait on its east. Landform of the bridge area is at the juncture of the Mindongnan hills and Fuzhou plain (the Minjiang Grade-I terrace), which mainly features submerged valley marine sediment plain. The starting section is at the farmland and vegetable plot with a smooth elevation of 5.0~7.6. The terminal point is at Gushan ridge. Except individual village’s elevation is 6.0~7.5, the rest slope elevation is 19.6~41.1. 3.1.3Stratigraphic geologyProject is planned to be built on the top of Quaternary geology composed of different rock formation (including alluvium, flood wash, marine accumulation, marine and land transit and drift bed). Underground is weathered granite. There is locally exposed granite scattered with other possible dikes. The engineering geology of the road will cross the ancient alluvial area of the Minjiang River and the old river channel mud alluvium, Cangshan relic slope and Cangnan mud alluvial area. The engineering geological conditions at the relic slope area are good, but engineering geological conditions at highly compressed sludge, shallow buried sludge and alluvial area are poor. Some sections along the road line have shallow-buried sludge layers. There are no high hills, steep slope, border slope, dislocated and fractured zone and earthquake fault zone. Topography of Nantaidao Island mainly features hills and plain, with a sea level of lower than 250m. Land surface doesn’t have much relief, but featuring “three high and two low”. The northwest part, middle and southeast part of the island are mainly hilly areas. The most famous Gaogaishan, Changanshan and Yantaishan ridges run through the middle and north areas. The highest hill in the central part is Gaogaishan with a seal level of 202m. Among the three big hills is mainly a plain. The southeast part is a broad alluvial plain. The whole surface relief tilts from the northwest to the southeast. The main topography of Nantaidao Island is hills, plain and river flood land. The hilly land features forest, bushes or wasteland. On the plain are orchard and vegetable plots. Nantaidao Island’s geology consists of hill slope and alluvial plain. Hills account for about 65％ and plain accounts for 35％. Hills expose. There are Jurassic Nanyuan volcanic rocks, late Yeshan fine granodiorite, and red middle grain granitite with vein materials. Hills are mainly composed of granite, then volcanic rocks and alluvium, where there are forests and fruit trees. Plain has Longhai group alluvium, Changle group marine accumulation and alluvial deposit of the Quaternary System, which is composed of fine sand, dust and clay. It is an area to grow crops, vegetables, fruits, trees and flowers. The basic earthquake intensity of the area where the project is is VII and near the earthquake area, and its basic earthquake intensity is 7o. 3.1.4Climate and meteorologyFuzhou enjoys a subtropical monsoon mild climate. Rainfall is plentiful. Rainfall and hot weather are in the same period of the year. According to meteorological data, Fuzhou’s average annual temperature is 19.6℃ for years. Years’ change is between 19.1℃ and 20.3℃. The highest monthly temperature is 28.8℃ in July. The extremely highest temperature is 39.5℃. The coldest month is January with a temperature of 6.9℃. The extremely lowest temperature is -2.3℃. There are about 3 days in a year with the lowest temperature below 0℃. The frostless period of a year is up to 325 days. Fuzhou region enjoys a plentiful rainfall. The annual rainfall is between 1000mm and 1500mm. The average annual rainfall is 1302.3 mm. From April to September of the year is the flood season; its rainfall accounts for 69～77％ of the year. Rainfall concentrates in April to June. August and September are the typhoon season with thunderstorms. The largest rainfall is in May and June, approximately accounting for 33％ of the year. The minimum rainfall is in November. May to September are a season of plum rains, typhoon and thunderstorms, the rainfall accounts for 47～83％ of the year. The primary wind direction of the year is southeast wind and frequency is 14.3％; the secondary wind direction of the year is south wind in summer and west wind in winter. The average annual wind velocity is 2.9m/s and the maximum wind velocity is 31.7m/s. The annual sunshine is up to 1700～1980 hours. 3.1.5River hydrology(1) The Minjiang River The Minjiang River with a total length of 2959km has its source in the Wuyi Range in the North of Fujian Province. It flows through 36 counties and cities, covering a flow area of 60992km2. According to the site statistic data measured by Zhuqi Hydrologic Station for 50 years from 1936 to 1985, the average annual runoff of the Minjiang River is 56.1 billion cubic meters, plus flow of Dazhangxi River and other branches, the average annual runoff of the Minjiang River is over 62 billion cubic meters. Distribution of the runoffs in 4 seasons is quite different. Runoff in spring accounts for 35.6%; 40.2% in summer; 14.2% in autumn and 10% in winter. From April to June is high water period, the runoff accounts for 47.9%, the largest runoff in June accounts for 20.7%, but the smallest runoff only accounts for 2.6% in January. The downstream of the Minjiang River is divided into south and north branches. The south branch is called Nangang (another name is Wulongjiang River); north branch is called Beigang (another name is Taijiang River). After the south and north branches respectively flow around Nantaidao Island and pass through Fuzhou, they join at Luoxingta, Mawei. The total length of the Minjiang River on Nantaidao Island is about 66km. After it flows through Tingtou, it divides into the south and north branches that flow into the sea at Meihua and Changmen respectively. The total length of the Beigang section from Huaian to Mawei is 31.99km. It is basically narrow in upstream and wide in downstream, between midstream and upstream is a canyon section of 5km long, whose main channel water depth is about 1.5~3m. The average gradient of Beigang is 1.5‰. The river section from the branch’s mouth to Hongshan Bridge is deep in water and narrow in width, during low water period, water surface width is 150~220m; water surface width of the river section from Hongshan Bridge to Jiefang Bridge is 200~300. The gradient of flood and tide (ebb tide) are all 1.2‰. After Jiefang Bridge, river width becomes about 500m gradually. The north river section starts from Hongshan Bridge and passes through Fuzhou urban area. The river channel is restricted between the dykes or hills on both banks of the river. On both banks are Ding Dam, Shun Dam, river land production wharfs and terminals. The total length of Nangang section from Huaian to Mawei’s Luoxingta is 34.8km. It appears wide up and narrow down. Except that Xiadou River is 350m wide, the other part of the river is about 2km wide. The average river width is 3~4 times that of Beigang. The water depth of the main channel near Wulongjiang Bridge is relatively deep, up to 12~15m; other sections are below 2m deep. The upstream of the river is less than 1.5m deep during low water. Nangang’s channel is relatively shallow. Shallow lands are changeable. Riverbed is higher than that of Beigang. The branch’s flow is relatively small during middle and low water periods. Since Nangang functions flood-diversion and sand discharge, it has a law of flood accumulation and low water flushing. The diversion ratio of Nangang and Beigang varies with Zhuqi’s flow. The runoff ratio of Nangang and Beigang is affected by the landform of the river distributary mouth and hydrologic period. In accordance with long-term observation, a bigger runoff flows through Nangang during flood time when water is diverted by Nangang and Beigang, but at middle water period, most water flows through Beigang. In recent year, Nangang runs dry sometimes at low water period. Refer to Table 3.1 1 for diversion ratio of Nangang and Beigang at various water periods Table 3.1 2 Diversion ratio of Nangang and Beigang
Minjiang mouth belongs to strong tidal continental river mouth. Tidal type is regular half-day one. Tide has two cycles in a day. Each cycle lasts 12 hours and 25 minutes. The average tide rising is about 5h and tide falling is about 7h and 25 minutes. 12 hours and 50 minutes is a tide rising and falling cycle. July and August of the lunar year is the big tide period. The 3rd and 18th days of each lunar month are monthly big tidal period. Big tide area boundary at the Minjiang mouth is near Houguan during the dry season, but the tide boundary reaches Wenshanli. The tide boundary is between Kuiqi and Majiang during the middle water period. The tide area boundary is at Jiefang Bridge at the low water period, but tide boundary is at Mawei. When Zhuqi flow is over 1300m3/s, there is basically no tide at Luoxingta section. The maximum tidal range at Baiyantan Station is 5.28m; the average tidal range is 3.8m. When the tide moves upstream, the tidal range will become smaller and smaller, so effect of the tide become weaker and tidal time becomes shorter. During the dry season, there is rare runoff in Nangang at Juyuanzhou section, river water only moves upstream during tide rising. (2) Inland river There are more than 20 inland rivers on Nantaidao Island. The main rivers are Longjin River, Gangtou River, Yuejin River, Yangqia River and Baihuting River. Most of the inland rivers are seriously silted up and water doesn’t flow smoothly. 3.1.6Underground waterFuzhou Basin covers an area of about 508km2. There is buried bedrock crevice-water. Reserve for exploitation is 21.3m3. There is rich void water and hot spring. It is verified that there is hot spring at Luozhou Town, Nantaidao Island, but it has to verify its reserve and quality. There is rich underground water at the alluvial plain along the road and shallowly buried. Since Fuzhou has rich surface water resource, utilization of cold underground water is very few. 3.1.7SoilNantaidao Island has 3 kinds of soils and 5 kinds of subsoils. 3 kinds of soils are regional lateritic soil, non-regional tidal soil and paddy soil. The lateritic soil mainly distributes at the hilly area on the island while the paddy soil distributes in elevation. Tidal soil and paddy soil crisscross on the plain, hilly glacis and slope region. Cultivated soil accounts over 2/3 of the total area of the district. Directory: curated curated -> Concept stage curated -> Concept stage curated -> Republic of Côte d'Ivoire Urbanization Review curated -> Report No: aus11011 Central America curated -> Report No. 94474-pk fiscal Disaster Risk Assessment Options for Consideration curated -> Environmental and Social Management Framework for the Costa Rica Telecommunications Sector Modernization Project curated -> Environment Impact Assessment For Jiangxi Shangrao Sanqingshan Airport Beijing Guohuantiandi Environmental Technology Development Center. Ltd. Oct. 2012 Content curated -> Growth through Innovation An Industrial Strategy for Shanghai By Shahid Yusuf Kaoru Nabeshima April 22nd, 2009 curated -> Report No: 70178. People's Republic of China Download 3.93 Mb. Share with your friends:
|