|
|
|
Sediment dynamics of turbidity maximum in Changjiang
River mouth in dry season |
| GAO Jianhua, YANG Yang, WANG Yaping, PAN Shaoming, ZHANG Rui |
| Key Laboratory for Coastal and Island Development of Ministry of Education, Nanjing University |
|
|
|
|
Abstract High-resolution current velocity and suspended sediment concentration (SSC) data were collected by using an Acoustic Doppler Current Profiler (ADCP) at two anchor stations and a cross-section in the South Channel of the Changjiang River mouth during meso and neap tides on Nov. 16, 2003. In addition, tidal cycle (13-hour) observation at two stations was carried out with traditional methods during the spring tide. Results indicated that resuspension occurred not only at the flood and ebb maximum, but also in the early phase of ebb in the meso and neap tide. When tidal current transited from high to ebb phase, current speed accelerated. Subsequently, fine-grained sediment with low critical threshold was resuspended and increased concentration. The river mouth area remained in siltation in the meso and neap tidal phase during the observation season, with calculated resuspension flux in the order of magnitude of 10-4–10-7 kg·m-2/s. Suspended sediment transport in the South Channel was dominated by freshwater discharge, but the Storks drift, vertical circulation and vertical shear effect due to tidal oscillation also played an important role in resuspension and associated sediment transport. In contrast, resuspension sediment flux in the spring tide was larger than that in meso and neap tide, especially at the ebb maximum and flood maximum. The present study revealed that intensive resuspension corresponded well with the larger current velocity during winter. In addition, the ‘tidal pumping’ effect and tidal gravity circulation were also vital for forming the turbidity maximum in the Changjiang River estuary.
|
|
Issue Date: 05 September 2008
|
|
| 1 |
Allen G P, Salomon J C, Bassoulet P, et al. (1980). Effect of tides on mixingand suspended sediment transport in macrotidal estuaries. Sedimentary Geology, 26: 69–90.
doi:10.1016/0037‐0738(80)90006‐8
|
| 2 |
Chen Z, WatanabeM, and Wolanski E (eds) (2007) . Sedimentological and biological processesof catchment to estuary example from the Yangtze and Mekong River.Estuarine, Coastal andShelf Science (Special issue), 71(1–2): 358
|
| 3 |
Dyer K R (1988). Fine sediment particle transport in estuaries. In: Dronkers J, Van Leussen W, eds. Physical Processesin Estuaries.Berlin: Springer-Verlag, 296–309
|
| 4 |
Eisma D (1993). Suspended matter in the aquatic environment. New York: Springer-Verlag, 315
|
| 5 |
Festa J F, Hansen D V (1976). A twodimensional numerical model of estuarine circulation: The effect ofaltering depth and river discharge. Estuarineand Coastal Marine Science, 5: 309–323.
doi:10.1016/0302‐3524(76)90063‐3
|
| 6 |
Festa J F, Hansen D V (1978). Turbiditymaximum in partially mixed estuaries: A two-dimensional numericalmodel. Estuarine and Coastal Marine Science, 7: 347–359.
doi:10.1016/0302‐3524(78)90087‐7
|
| 7 |
Gallenne B (1974). Study of Fine materials in suspension in the estuaryof Loire and its dynamic grading. Estuarineand Coastal Marine Science, 2: 261–272.
doi:10.1016/0302‐3524(74)90016‐4
|
| 8 |
Gao J H, Wang Y P, Wang A J, et al. (2004). Suspended sediment behaviorand transport in Changjiang River Estuary. Geography Research, 23(4): 455–462 (in Chinese)
|
| 9 |
Glangeaud L (1938). Transport et sedimentation clans l'estuairc et a l'embouchurede La Gironde. Bulletin of Geological Societyof France, 8: 599–630
|
| 10 |
Li J F, He Q (2000). A studyon sediment deposition and resuspension in the mouth bar area of theChangjiang River Estuary. Oceanologia andLimnologia Sinica, 31(1): 101–109 (in Chinese)
|
| 11 |
Mao Z C (1995). Salty water intrusion in the Changjiang River Estuary. Oceanologia and Limnologia Sinica, 26(6): 643–649 (in Chinese)
|
| 12 |
Pan D A, Shen H T, Mao Z C (1999). Formation mechanism and featuresof the turbidity maximum in the Changjiang River Estuary. Acta Oceanologica Sinica, 21(4): 62–69 (in Chinese)
|
| 13 |
Pan D A, Sun J M (1996). The sedimentdynamics in the Changjiang River Estuary mouth bar area. Oceanologia and Limnologia Sinica, 27(2): 279–286 (in Chinese)
|
| 14 |
Partheniades E (1965). Erosion and deposition of cohesive soil. Journal of the Hydraulics Division, ASCE, 91(HY1): 105–139
|
| 15 |
Schubel J R (1968). Turbidity maximum of the Northern Chesapeake Bay. Science, 161: 1013–1015.
doi:10.1126/science.161.3845.1013
|
| 16 |
Shen C L, Yuan W J (1986). Experimentalstudy on characteristics of erosion and deposition on seabed of theChangjinag River Estuary. Sediment research, 3: 62–73 (in Chinese)
|
| 17 |
Shen H T, Pan D A (2001). Turbiditymaximum in the Changjiang Estuary. Beijing: Ocean Press, 194 (in Chinese)
|
| 18 |
Shi W R, Shen H T, Li J F (1993). Review on the formation of estuarineturbidity maximum. Advance in Earth Science, 8(1): 8–13 (in Chinese)
|
| 19 |
Shi Z (2000). Fine grain size sediment process in the Changjiang Estuary. Sediment Research, 6: 72–81 (in Chinese)
|
| 20 |
Shi Z, Ling H L (1999). Verticaldistribution of Fine grain size sediment in the Changjiang River Estuary. Sediment Research, 2: 59–64 (in Chinese)
|
| 21 |
Shi Z, Ren L F, Hamilton L J (1999). Acoustic profiling of fine suspensionconcentration in the Changing Estuary. Estuaries, 22(3A): 648–656.
doi:10.2307/1353052
|
| 22 |
Shi Z, Ren L F, Lin H T (1996). Vertical suspension profile in theChangjiang Estuary. Marine Geiolgy, 130: 72–81
|
| 23 |
Shi Z, Ren L F, Zhang S Y, et al. (1997). Acoustic imaging of cohesivesediment resuspension and re-entrainment in the Changing Estuary,East China Sea. Geo-Marine Letters, 17: 162–168.
doi:10.1007/s003670050022
|
| 24 |
Su J L, Wang K S (1986). The suspendedsediment balance in Changjiang Estuary. Estuary, Coastal and Shelf Science, 23: 81–98.
doi:10.1016/0272‐7714(86)90086‐7
|
| 25 |
Wang Y P, Gao S, Li K Y (1999). A preliminary study on suspendedsediment concentration measurements using an ADCP mounted on a movingvessel. Oceanologia and Limnologia Sinica, 30(6): 758–763 (in Chinese)
|
| 26 |
Wang Z H, Li L Q, Chen D B, et al. (2007). Plume front and suspendedsediment dispersal off the Yangtze (Changjiang) River mouth, Chinaduring non-flood season. Estuarine, Coastaland Shelf Science, 71: 60–67.
doi:10.1016/j.ecss.2006.08.009
|
| 27 |
Wellershaus S (1981). Turbidity maximum and mud shoaling in the Weser Estuary. Archiva Hydrobiological, 92: 161–198
|
| 28 |
Yang S L, Zhao Q Y, Belkin I M (2002). Temporal variation in the sedimentload of the Yangtze River and the influences of the human activities. Journal of Hydrology, 263: 56–71.
doi:10.1016/S0022‐1694(02)00028‐8
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
