Application of Mathematical Modelling for Environmental Assessment of Sand Dredging
Doe to the increasing demand of marine sand for marine works, the Civil Engineering Department considered in 2001 the feasibility to extend the East Lamina Channel Marine Borrow Area. One of the major considerations was the water quality impacts due to the extension. As such, mathematical models were set up to simulate the development and decay of sediment plume under the influence of water current and to predict the probable extent it might affect.The reliability of mathematical models depended very much on bow well calibration and verification had been carried out. In this regard, a series of field measurements were conducted to collect data on current, suspended solids concentration and extent of sediment plume during trial sand dredging at the marine borrow area. The collected field data were used to calibrate and verify the models to ensure its accuracy, and to determine the key sediment parameters such as settling velocity. Upon completion of the calibration and verification, scenario runs under different dredging locations and speeds were carried out. Based on the results, the dredging proposals were checked for compliance with the water quality objectives.
mathematical modelling water quality measurement environmental assessment marine sand sediment settling velocity critical shear stress
WONG Ching-piu LEE Wai-ping
Civil Engineering Department The Government of HKSAR
国际会议
The First China International Dredging Congress and Exhibition（中国第一届国际疏浚技术发展会议）
上海
英文
331-341
2003-11-26（万方平台首次上网日期，不代表论文的发表时间）