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2014 | 23 | 4 |

Tytuł artykułu

Measurements of erosion rate of undisturbed sediment under different hydrodynamic conditions in Lake Taihu, China

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Sediment erosion and nutrient release play a significant role on the degradation of water quality and eutrophication in large shallow lakes. Lake Taihu, the third largest freshwater lake in China, is suffering severe eutrophication and internal nutrient release. In this paper, sediment cores were sampled in different lake regions to determine sediment properties (e.g. particle size and bulk density), nutrient concentrations in the sediment, etc. Flume experiments were developed to examine the sediment erosion rate by using the undisturbed sediment cores under different hydrodynamic conditions in Lake Taihu. The results showed that the sediment properties exhibited great spatial heterogeneity. Particle sizes decreased with increasing depth of sediment thickness. Sediment bulk density increased with sediment depth. TN concentration increased with sediment depth, while TP concentration didn’t show a similar trend in different sampling sites. Erosion rate is a function of particle size, bulk density, and shear stress. It decreased with increasing sediment depth and decreasing flow velocity. The erosion depth in this study was less than 1cm under the flow velocity of 5 to 30 cm/s, indicating that unidirectional flows have little impact on sediment erosion in Lake Taihu.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

23

Numer

4

Opis fizyczny

p.1235-1244,fig.,ref.

Twórcy

autor
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education, Hohai University, Nanjing 210098, China
  • College of the Environment, Hohai University, Nanjing 210098, China
autor
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education, Hohai University, Nanjing 210098, China
  • Fujian Provincial Investigation, Design and Hydropower, Fuzhou 350001, China
autor
  • College of the Environment, Hohai University, Nanjing 210098, China
autor
  • College of the Environment, Hohai University, Nanjing 210098, China
  • College of Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
autor
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education, Hohai University, Nanjing 210098, China
  • College of the Environment, Hohai University, Nanjing 210098, China
autor
  • State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
autor
  • Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV, 89119, USA

Bibliografia

  • 1. LU M.F., XU B., YANG X.C. Evaluation method for water quality of Lake Taihu and its variation in recent years. Water Resources Protection, 24, (5), 2008.
  • 2. JIN X.C., WANG S.R., PANG Y. Phosphorus fractions and the effect of pH on the phosphorus release of the sediments from different trophic areas in Taihu Lake, China. Environ. Pollut., 139, 288, 2006.
  • 3. RICH J., JESSE R., WILBERT L. Effects of Bulk Density on Sediment Erosion Rates. Water Air Soil Poll., 99, 21, 1997.
  • 4. RICHARD A. Uncertainty in Experimental Techniques for Measuring Sediment Erodability. Integrated Environmental Assessment and Management, 2006.
  • 5. JESSE R., RICH J., DOUG G., WILBERT L. Effects of Particle Size and Bulk Density on Erosion of Quartz Particles. J. Hydraul. Eng.-ASCE, 124, (12), 1998.
  • 6. HOUWING E.J., VAN RIJN L.C. In situ erosion flume (ISEF): determination of bed-shear stress and erosion of a kaolinite bed. J. Sea Res. 39, 243, 1998.
  • 7. LI Y.P., KUMUD A., YU Z.B. Modeling impacts of Yangtze River water transfer on water ages in Lake Taihu, China. Ecol. Eng., 37, 325, 2011.
  • 8. QIN B.Q., HU W.P., GAO G., LUO L.C., ZHANG J.S. Dynamics of sediment resuspension and the conceptual schema of nutrient release in the large shallow Lake Taihu, China. Chinese Sci. Bull., 49, (1), 2004.
  • 9. XU H., YANG L., ZHAO G., JIAO J., YIN S., LIU Z. Anthropogenic impact on surface water quality in Taihu Lake region, China. Pedosphere, 19, (6), 765, 2009.
  • 10. HU W., ZHAI S., ZHU Z., HAN H. Impacts of the Yangtze River water transfer on the restoration of Lake Taihu. Ecol. Eng. 34, (1), 30, 2008.
  • 11. XU X.Z., QIAN H.Z., ZHAO Q.H. Effects of wind field on spatial distribution of chlorophyll-a concentration in Lake Taihu. Chinese Journal of Ecology, 31, (5), 1282, 2012.
  • 12. LUO L.C., QIN B.Q., ZHU G.W. Sediment distribution and the maximum resuspension depth with disturbance in Lake Taihu. Journal of Sediment Research, 1, 2004.
  • 13. HU C.H., HU W.P., ZHANG F.B., HU Z.X., LI X.H., CHEN Y.G. Research of sediment resuspension in Lake Taihu. Chinese Sci. Bull., 5, (22), 2005.
  • 14. ZHANG H. Study on distribution and denthic fluxes of nutrients in sediments of Yellow Sea and East China Sea. A Dissertation for the Master Degree of the Ocean University of China, 2009.
  • 15. WANG H.X. The environmental variations and spatial and temporal dynamic variations of Total Organic Carbon and Total Nitrogen in surface sediments of the Yangtze Estuary. A Dissertation for the Master Degree of Marine Ecology in the Graduate School of Chinese Academy of Sciences, 2010.
  • 16. ZHANG L., FAN C.X., QIN B.Q., YANG L.Y. Experimental study on the effect of disturbances on the sur­face sediment phosphorus dynamics in Lake Taihu. Journal of Lake Sciences, 13, (1), 2001.

Uwagi

rekord w opracowaniu

Typ dokumentu

Bibliografia

Identyfikatory

Identyfikator YADDA

bwmeta1.element.agro-7806a8e3-5623-4d4c-afdb-b9b143aee238
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