By use of a shoreline-change numerical model(GENESIS)based on one-line theory,a preliminary modeling study on shoreline changes caused by a beach nourishment project in Beidaihe,China,is presented in this paper.Firstl...By use of a shoreline-change numerical model(GENESIS)based on one-line theory,a preliminary modeling study on shoreline changes caused by a beach nourishment project in Beidaihe,China,is presented in this paper.Firstly,the GENESIS model is verified and model sensitivity to the major parameter changes is discussed by simulating a hydraulic model test.The beach nourishment project,after that the shoreline change is kept being monitored,is a small-scale emergency one carried out to use two bathing places on the west beach in the summer,2008.In this paper the shoreline changes caused by the beach nourishment project are modeled by the GENESIS model,and the computed results fit well with the measured shorelines.With the same model and parameters,a long-term performance of the project is predicted,and the result shows that the bathing places only can be suitable for bathing in 2 to 3 years without subsequence nourishment project.Therefore,it is proposed to nourish the beaches in time to keep the service life of the beach in recent years and carry out the beach nourishment project for the whole west beach as soon as possible.展开更多
Beach nourishment is a common coastal management strategy used to protect beach from erosion along the sandy coastlines. This method has been successfully applied to an emergency project at the West Beach of Beidaihe ...Beach nourishment is a common coastal management strategy used to protect beach from erosion along the sandy coastlines. This method has been successfully applied to an emergency project at the West Beach of Beidaihe in the summer of 2008 and the full West Beach nourishment project in 2009-2010, which is the direct base of this study. Some basic information about the emergency engineering area at the Middle Beach is firstly described. The shoreline change of this area, including the analysis of beach width in five monitoring profiles in the bathing places of Middle Beach, is then discussed. After that a numerical model based on one-line theory is established and the numerical results agree well with the measured shorelines, which indicates that the model is appropriate and is qualified to predict the shoreline change of the Middle Beach. With the same model and parameters, long-term performance of the project is predicted, and the result shows that without follow-up nourishment and project, the bathing places can remain suitable for bathing for about 10 a. It is suggested to nourish the beach in time and carry out the beach nourishment project for the full Middle Beach in Beidaihe.展开更多
The finite element method(FEM) was used to simulate sediment hydrodynamics at the Beidaihe International Yacht Club,and a two-dimensional model was established.The sediment movement and deposition were analyzed under ...The finite element method(FEM) was used to simulate sediment hydrodynamics at the Beidaihe International Yacht Club,and a two-dimensional model was established.The sediment movement and deposition were analyzed under many tidal conditions in conjunction with the hydrological regime of the Daihe River.The peak value of the sediment deposition thickness appears in the main channel and around the estuary.The sediment deposition thickness is essentially constant and relatively small in the project area.The sediment deposition thickness in the main channel,in the yachting area,and around the hotel is greater than the other areas in the project.Regular excavation and dredging of the channel is the best measure for mitigating the sedimentation.展开更多
The concentrations of heavy metals, Cd, Hg, Pb, Cu and As in marine sediments from 138 sites located in the Beidaihe near-shore area of Bohai bay, were analyzed to find out the distribution characteristics of these he...The concentrations of heavy metals, Cd, Hg, Pb, Cu and As in marine sediments from 138 sites located in the Beidaihe near-shore area of Bohai bay, were analyzed to find out the distribution characteristics of these heavy metals. Potential Ecological Risk index were adopted to assess the heavy metals contamination, and the assessment results indicated that the content of heavy metals in this area is in a low to moderate level, while high values were found in the southwest and northeast region, and the value in the middle region is comparatively low. The high pollution hazard sites were close to the Renzaohe estuary and Shihe estuary and the high risk is mainly led by Hg.展开更多
Beidaihe,a city by the sea,is quite beautiful and the air there is so good to breathe.It is easy to go there by train.Besides,you can also take a bus or plane.In the eyes of some people,Beidaihe is a place hard to get...Beidaihe,a city by the sea,is quite beautiful and the air there is so good to breathe.It is easy to go there by train.Besides,you can also take a bus or plane.In the eyes of some people,Beidaihe is a place hard to get to,but I went to Beidaihe for a trip this summer with my parents.We visited many interesting places and had lots of fun.展开更多
基金supported by two funds from the Department of Land and Resources of Hebei Province,China(Grant Nos.HEBEIGT2006ZT and HEBEIGT2008-2903)two grants from the Ministry of Science and Technology,China(Grant Nos.2008BAJ08B14 and 2007FY110300-03)
文摘By use of a shoreline-change numerical model(GENESIS)based on one-line theory,a preliminary modeling study on shoreline changes caused by a beach nourishment project in Beidaihe,China,is presented in this paper.Firstly,the GENESIS model is verified and model sensitivity to the major parameter changes is discussed by simulating a hydraulic model test.The beach nourishment project,after that the shoreline change is kept being monitored,is a small-scale emergency one carried out to use two bathing places on the west beach in the summer,2008.In this paper the shoreline changes caused by the beach nourishment project are modeled by the GENESIS model,and the computed results fit well with the measured shorelines.With the same model and parameters,a long-term performance of the project is predicted,and the result shows that the bathing places only can be suitable for bathing in 2 to 3 years without subsequence nourishment project.Therefore,it is proposed to nourish the beaches in time to keep the service life of the beach in recent years and carry out the beach nourishment project for the whole west beach as soon as possible.
基金The Department of Land and Resources of Hebei Province,China under contract Nos HEBEIGT2006ZT and HEBEIGT2008–2903the State Oceanic Administration of China under contract No.2009008-05Kwang-Hua Fund for College ofCivil Engineering,Tongji University of China
文摘Beach nourishment is a common coastal management strategy used to protect beach from erosion along the sandy coastlines. This method has been successfully applied to an emergency project at the West Beach of Beidaihe in the summer of 2008 and the full West Beach nourishment project in 2009-2010, which is the direct base of this study. Some basic information about the emergency engineering area at the Middle Beach is firstly described. The shoreline change of this area, including the analysis of beach width in five monitoring profiles in the bathing places of Middle Beach, is then discussed. After that a numerical model based on one-line theory is established and the numerical results agree well with the measured shorelines, which indicates that the model is appropriate and is qualified to predict the shoreline change of the Middle Beach. With the same model and parameters, long-term performance of the project is predicted, and the result shows that without follow-up nourishment and project, the bathing places can remain suitable for bathing for about 10 a. It is suggested to nourish the beach in time and carry out the beach nourishment project for the full Middle Beach in Beidaihe.
文摘The finite element method(FEM) was used to simulate sediment hydrodynamics at the Beidaihe International Yacht Club,and a two-dimensional model was established.The sediment movement and deposition were analyzed under many tidal conditions in conjunction with the hydrological regime of the Daihe River.The peak value of the sediment deposition thickness appears in the main channel and around the estuary.The sediment deposition thickness is essentially constant and relatively small in the project area.The sediment deposition thickness in the main channel,in the yachting area,and around the hotel is greater than the other areas in the project.Regular excavation and dredging of the channel is the best measure for mitigating the sedimentation.
文摘The concentrations of heavy metals, Cd, Hg, Pb, Cu and As in marine sediments from 138 sites located in the Beidaihe near-shore area of Bohai bay, were analyzed to find out the distribution characteristics of these heavy metals. Potential Ecological Risk index were adopted to assess the heavy metals contamination, and the assessment results indicated that the content of heavy metals in this area is in a low to moderate level, while high values were found in the southwest and northeast region, and the value in the middle region is comparatively low. The high pollution hazard sites were close to the Renzaohe estuary and Shihe estuary and the high risk is mainly led by Hg.
文摘Beidaihe,a city by the sea,is quite beautiful and the air there is so good to breathe.It is easy to go there by train.Besides,you can also take a bus or plane.In the eyes of some people,Beidaihe is a place hard to get to,but I went to Beidaihe for a trip this summer with my parents.We visited many interesting places and had lots of fun.
