Báo cáo nghiên cứu khoa học Structural measures to restore Cua Tung beaches, Quang Tri province

Bài viết này trình bày các tính toán sử dụng các mô hình LITPACK, nhằm lựa chọn các giải pháp phục hồi cho bãi biển Cửa Tùng, bị xói mòn nghiêm trọng trong những năm gần đây. Các kết quả chỉ là sơ bộ, nhưng chúng rất hữu ích để chỉ đạo các biện pháp tối ưu để mang lại cho bãi biển trở lại trạng thái ban đầu của nó phục vụ phát triển kinh tế xã hội tỉnh Quảng Trị. T
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Báo cáo nghiên cứu khoa học " Structural measures to restore Cua Tung beaches, Quang Tri province "VNU Journal of Science, Earth Sciences 26 (2010) 98-103 Structural measures to restore Cua Tung beaches, Quang Tri province Nguyen Tho Sao1,*, Tran Ngoc Anh1, Nguyen Thanh Son1, Hoang Thai Binh2 1 Faculty of Hydro-Meteorology and Oceanography, Hanoi University of Science, VNU, 334 Nguyen Trai, Hanoi, Vietnam 2 Geography Institute, Vietnam Academy of Science and Technology Received 05 September 2010; received in revised form 24 September 2010 Abstract. This paper presents the calculations using LITPACK models, aiming to select the restoration solution for Cua Tung beach, severely eroded in recent years. The results are just the preliminary, but they are useful to direct the optimal measures to bring the beach back to its original state serving the social and economic development in Quang Tri province. Keywords: MIKE, LITPACK, erosion, cross-sections, sediment, coastline.1. Introduction and indirect, long term and short term), there is still not a detailed study which confirms the Cua Tung beach of Quang Tri province was solid scientific basis and can help for theone of the most beautiful ones, attracting many construction of the project. In 2009, thevisitors (fig.1a). In recent years, Cua Tung Department of Natural Resources andbeach is increasingly eroded shrinking its width Environment of Quang Tri province indue to erosion in both scale and intensity, which collaboration with Hanoi University of Scienceleads to the loss of tourism (fig.1b). Social set the r esearch project named InvestigationEconomic Development Strategy of Quang Tri and assessment of beach erosion Cua Tung,province puts tourism as a effective way to Quang Tri Province in order to establish thebring the province out of poverty, and the scientific basis to determine the causes of beachrestoring the Cua Tung beach is an urgent task. erosion, and then to find out the solutions toDespite the fact that there are several overcome Cua Tung beach erosion.assumptions about the causes of erosion (direct_______ Corresponding author. Tel.: 84-4-38584945. E-mail: saont@vnu.edu.vn 98 99N.T. Sao et al. / VNU Journal of Science, Earth Sciences 26 (2010) 98-103 Fig.1. Cua Tung beach before (a) and now (b).100 N.T. Sao et al. / VNU Journal of Science, Earth Sciences 26 (2010) 98-103 new, but not easy to solve, and is still in2. Research methodology research status. At Cua Tung, the coincidence At present many coastal areas of the of events after building the groin, fish port andVietnam are changing, not only Cua Tung but bridge (fig.2) may lead to the argument that thealso the coastal areas of high economic value of groin was the main reason leading to beachthe provinces like Quang Ninh, Hai Phong, erosion. The analysis of mathematical modelingNam Dinh, Quang Ngai , Binh Thuan, Vung results show that the groin had retained a largeTau .. which are at risk of landslides, bank amount of sand that can be not only a part oferosion. Several scientific researches [1-4] have channel filling, but can be added to the northfound that the subject we consider about is not beaches. Bridge Port Groi Fig.2. Combination of groin (left), bridge (middle), and port (right). Traditionally, the following methods can be No. 9 in 2009. These data are particularlyused: important to the application of mathematical models. - Data collection: observed - Collecting and processing publichydrometeorological data at Con Co station information: opinions of local peoples, photos,updated to 2008, wind and wave data available records in site, guides of local authority.at Cua Tung, topographic data, geologicalsamples, geomorphological characteristics - Application of physical models andobtained by TEDI, aerial images. mathematical models. In ...