ADP-flow velocity profile to interpret hydromorphological features of China's Yangtze Three-Gorges valley  

作　　者：CHENJing CHENZhongyuan WANGZhanghua MasatakaWatanabe 

机构地区：[1]KeyLaboratoryofGeographicInformationScience,EastChinaNormalUniversity,Shanghai200062,China [2]StateKeyLaboratoryofEstuarineandCoastalResearch,Shanghai200062,China//NanjingInstituteofGeographyandLimnologyofChineseAcademyofSciences,Nanjing210008,China [3]StateKeyLaboratoryofEstuarineandCoastalResearch,Shanghai200062,China [4]NationalInstituteforEnvironmentalStudies,Tsukuba,Japan

出　　处：《Chinese Science Bulletin》2005年第7期679-684,共6页

基　　金：supported by tbe National Natural Science Foundation of China(Grant No.40341009);APN/START(Grant No.2004-06-CMY);the Global Environment Research Fund of the Ministry of the Environment of Japan

摘　　要：In late May and early June, 2002, a field inves- tigation was conducted along the Three-Gorges valley of the upper Yangtze catchment by ADP (Acoustic Doppler Profile SONTEK-500). Data obtained when surveying were accom- panied with discharge of <15000 m3/s in the valley and char- acterize the unique river-flow velocity profile and riverbed morphology. Taking into consideration the relationship be- tween the average flow velocity and fluvial variables, four distinct river sections can be highlighted, i.e. Chongqing- Wanxian, Wanxian-Fengjie, Fengjie-Zigui and Gezhou res- ervoir area (upstream to downstream). The average flow velocity is in-phase with river width from Chongqing to Wanxian. High-flow velocity ranging from 3.0 to 4.0 m/s is recorded at many sites, where the wider river channel (>1000 m) and shallower water depth (<20 m) occur and large-size gravel shoals prevail. Alternated low-flow velocity (<1.5 m/s) appears at those river sections with deep water (>50 m) and U-shaped river-channel morphology. Mapping the river cross-section area at those sites can determine that smaller cross-section area accelerates the flow velocity. From Wanxian to Fengjie, the average flow velocity ranging from 3.0 to 4.5 m/s is in-phase with the water depth. The high-flow velocity is associated with narrower river-channel, where V-shaped gorges valley occurs with small cross-section area. Further downstream from Fengjie to Zigui, the low flow ve- locity is linked to deep river channel characterized by W-shaped valley morphology of large cross-section area, in general. The average flow velocity is 2.5―3.5 m/s, and maxi- mum can reach 6.0 m/s near Wu-Gorge. Our survey had also detected a slow-flow velocity (mostly <1.0 m/s) in the river channel of about 100 km long in the Gezhou reservoir downstream. Heavy siltation to 20 m thick above the former riverbed and about 20 km extending upstream from the Dam site occurs above Gezhou Dam. The backwater can reach 150 km due to elevated water level to 27 m by the damming at the end ofIn late May and early June, 2002, a field investigation was conducted along the Three-Gorges valley of the upper Yangtze catchment by ADP (Acoustic Doppler Profile SONTEK-500). Data obtained when surveying were accompanied with discharge of < 15000 m(3)/s in the valley and characterize the unique river-flow velocity profile and riverbed morphology. Taking into consideration the relationship between the average flow velocity and fluvial variables, four distinct river sections can be highlighted, i.e. Chongqing-Wanxian, Wanxian-Fengjie, Fengjie-Zigui and Gezhou reservoir area (upstream to downstream). The average flow velocity is in-phase with river width from Chongqing to Wanxian. High-flow velocity ranging from 3.0 to 4.0 m/s is recorded at many sites, where the wider river channel (> 1000 m) and shallower water depth (< 20 m) occur and large-size gravel shoals prevail. Alternated low-flow velocity (< 1.5 m/s) appears at those river sections with deep water (> 50 m) and U-shaped river-channel morphology. Mapping the river cross-section area at those sites can determine that smaller cross-section area accelerates the flow velocity. From Wanxian to Fengjie, the average flow velocity ranging from 3.0 to 4.5 m/s is in-phase with the water depth. The high-flow velocity is associated with narrower river-channel, where V-shaped gorges valley occurs with small cross-section area. Further downstream from Fengjie to Zigui, the low flow velocity is linked to deep river channel characterized by W-shaped valley morphology of large cross-section area, in general. The average flow velocity is 2.5-3.5 m/s, and maximum can reach 6.0 m/s near Wu-Gorge. Our survey had also detected a slow-flow velocity (mostly < 1.0 m/s) in the river channel of about 100 km long in the Gezhou reservoir downstream. Heavy siltation to 20 m thick above the former riverbed and about 20 km extending upstream from the Dam site occurs above Gezhou Dam. The backwater can reach 150 km due to elevated water level to 27 m by the damming at the end of 1970s, a

关 键 词：长江 山峡流域 中国 流速 沉淀物 河床 

分 类 号：P942.77[天文地球—自然地理学] P343.1