Study On Impacts Of The Haiyang Harbor’s Construction On The Sandy Coast

Haiyang Harbor is located in Haiyang City, Yantai (a coastal city in Shandong Province,northeast China), which faces Rushan Estuary to its northeast and Dingzi Estuary to itssouthwest. The surroundings of the harbor are sandy coasts with straight coastlines. With thedeveloping of the hinterland economy and shipping condition in recent years, the constructionsize of Haiyang Harbor is enlarging year by year, forming harbor land area through gradually seafilling. The present sea filling project in planning of the east district of Haiyang Harbor is just offthe sandy coasts, which means the construction will inevitably bring some impacts to the sandycoasts as well as challenges to coast resources. Therefore, it is of great significance to studyimpacts of Haiyang Harbor’s construction on the sandy coast from the perspectives ofengineering suitability and coast protection.Based on various data of hydrology, meteorology, water depth, and surface sediments, thisthesis analyzes distribution features of the surface sediments and erosion and deposition historyin the study area. Tidal current field, wave field and the geomorphology change due to erosionand deposition in the study area before and after the construction of the east district of HaiyangHarbor are numerically simulated by utilizing MIKE21. In addition, by combining long-shoresediment discharge calculation and LITPACK numerical simulation, this thesis analyzes coastalsediment transport situation in the study area, predicts sandy coastline evolution afterconstruction, and eventually probes the impacts of the Haiyang Harbor’s construction on thesandy coast from aspects of erosion and deposition change and coastal evolution.The result reveals that currents in the study area are east-west reciprocating flow, and theebb current from west to east is slightly stronger than the flood current from east to west. Theregular wave direction are SSW, SW and S, while the strong wave direction is SE. Sediments inthe study area are generally carried from the west to the east.After the construction of the east district of Haiyang Harbour, the sea bed in south of thewharf area will be heavily eroded. The maximum annual erosion rate could be around0.050m.Both east and west sides of the wharf area will experience deposition within the water depth of7~9m. Deposition in the east area is slightly stronger than that in the west, with the maximumannual deposition of0.014m. However, deposition in the east and erosion in the south andsoutheast of the west district will be weakened. Two water channels between the comprehensive supporting service area and harbour evacuating road as well as the wharf areas will experiencestrong washing action, while both sides of the water channels will experience deposition.After the construction of the east district of Haiyang Harbour, the coastlines will primarilyexperience silting-up. The maximum deposition will be seen in breakwater root area andnorthwest of the comprehensive supporting service area. One year after construction, thecoastline will be pushed toward the sea by56~110m on average, with the maximum of195~630m. While the maximum profile deposition thickness could be about0.8~1.8m. Fiveyears after construction, the coastline will be pushed toward the sea by195~630m on average,with the maximum of508~1042m. And the maximum profile deposition thickness could beabout2.1~3.8m. The first year after construction will witness the largest silting-up distance,which will decrease year by year till it reach the dynamic balance after5years.