Numerical study of shoreline changes by emergency beach nourishment project at the Middle Beach of Beidaihe, China
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Numerical study of shoreline changes by emergency beach nourishment project at the Middle Beach of Beidaihe, China ZHANG Yu1,2 , HE Lulu2 , KUANG Cuiping2∗ , PAN Yi2 , GU Jie3 , YANG Yanxiong4 , ZHANG Jiabo2,4 1
College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
2
Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
3
College of Marine Science, Shanghai Ocean University, Shanghai 201306, China
4
Qinhuangdao Mineral Resource and Hydrogeological Brigade, Hebei Geological Prospecting Bureau, Qinhuangdao 066003, China
Received 26 April 2010; accepted 28 July 2011 © The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2012
Abstract 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. Key words: one-line model, numerical model, shoreline change, beach nourishment, Middle Beach in Beidaihe
year. Beach nourishment has been practised to protect beach from erosion. It involves beach fill with borrowed sand and some accessorial coastal projects such as jetties, groins and breakwaters. There are some new acknowledged advantages for beach nourishment in the recent years. In Ranasinghe and Turner’s (2006) opinion, submerged coastal structures are perceived to be capable of providing beach protection, without the adverse impacts often associated with more conventional structures such as revetments and groins. For long-term effect, a breakwater is constructed on the Tweed River entrance to transport
1 Introduction Beach is a popular tourism place for leisure and water sports for its 3S (sunlight, sand beach, sea food) resources. Low investment and huge economic benefit are among many of the characteristics of beach tourism, so it is very important for the countries all over the world to develop, utilize and protect the beach. However, beach erosion is prevalent in
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