Study on Siltation Risk for Dalian Zhuanghe Huanquan Dock Dredging Project in Construction Period
Type:
Presented during:
WODCON XIX: "Dredging makes the World a better place" - 2010, Beijing, China
Authors:
ZHOU Jun, CHEN Yimei, LUO Hong
Abstract: Based on a large number of on-site observations at three times during dredging of Dalian Zhuanghe Huanquan Dock channel from February, 2006 to March, 2009, The risks of sediment deposition to the dredging corporations in the construction process are explored, as well as the risk assessment of sediment deposition in the construction period. Studies have shown that the main risks to the increase of the amount of construction period accretion in Zhuanghe Huanquan Dock channel are the underestimation of sediment deposition caused by natural factors (wind, waves and currents), and the drastic sand accretion under the actions of typhoons. In the infrastructure period, the underestimation of natural accretion risk index is 0.083, and this risk can be ignored. Typhoon accretion risk index is 0.938, which is a medium risk. In the maintenance dredging period, accretion risk is related to the selection of construction period, and typhoon accretion risk index is 2.69, which is a high risk, during the period from August to September; during monsoon period from May to June, the risk index of underestimation of natural accretion is 0.153, which is a low risk. The risks during the non-monsoon period and the non-typhoon period can be ignored.
Keywords: dredging project, accretion, drastic sand accretion, risk index, risk evaluation