tailieunhanh - Báo cáo nghiên cứu khoa học " Study on wave setup with the storm surge in Hai Phong coastal and estuarine region "

Làn sóng thiết lập là sự gia tăng của mực nước trong khu vực lướt sóng do chuyển sóng liên quan đến động lực cột nước trong quá trình phá vỡ sóng. Làn sóng thiết lập góp phần vào chiều cao tổng lượng nước trong cơn bão và trở thành nguy hiểm để xây dựng ven biển. Nghiên cứu này trình bày một số kết quả vào thiết lập sóng dâng do bão bằng cách sử dụng mô hình số và mô hình thực nghiệm. Nó cũng ước tính sự đóng góp của làn sóng thiết lập trong tổng mức. | VNU Journal of Science Earth Sciences 26 2010 82-89 Study on wave setup with the storm surge in Hai Phong coastal and estuarine region Nguyen Xuan Hien Dinh Van Uu Tran Thuc Pham Van Tien Faculty of Hydro-Meteorology and Oceanography Hanoi University of Science VNU 334 Nguyen Trai Hanoi Vietnam Received 05 September 2010 received in revised form 24 September 2010 Abstract. Wave setup is the increase of water level within the surf zone due to the transfer of wave-related momentum to the water column during wave-breaking. Wave setup contributes to the total water height in storm and become dangerous to coastal construction. This study presents some results on wave setup with storm surge using numerical model and empirical model. It also estimates the contribution of wave setup in total storm tide level at coastal and estuarine region of Hai Phong. Results show that wave setup at coastal and estuarine region in Hai Phong contributes about 25 to 40 of sea level surge in storm 32 on average. Keywords wave setup storm surge Hai Phong. 1. Introduction A storm surge with high waves often causes severe damage when it coincides with high tides. In Viet Nam typhoon Damrey in 2005 broke sea dykes and resulted in severe flooding by storm tide in Nam Dinh and Thanh Hoa provinces. Storm surge can several inland from the estuary. Waves ride above the surge levels causing wave runup and mean water level setup. These wave effects are significant near the landfall area and are affected by the process that typhoon approaches the coastline. In the 1960s the theory of wave setup were developed by Longuet-Higgins and Stewart 1960 1962 1963 1964 1 2 it shows that Corresponding author. Tel. 84-4-37730409. E-mail nguyenxuanhien@. vn wave setup occurred due to horizontal change of radiation stress. The theory was highly useful in explaining the increase and decrease of sea level causing by waves as well as mechanism of the surf waves in the near shore. Bowen et al. 1968 carried out