tailieunhanh - Tác động của công trình đến thay đổi đường bờ biển tỉnh Trà Vinh

Đường bờ biển Trà Vinh dài khoảng 65 km từ cửa Cung Hầu đến Định An, được cấu tạo bởi trầm tích bở rời, nên dễ chịu tác động của các yếu tố tự nhiên và hoạt động của con người. Trên cơ sở phân tích ảnh vệ tinh kết hợp khảo sát và đo đạc tại hiện trường, diễn biến thay đổi đường bờ biển giai đoạn 1966–2014 đã được xác định. | Vietnam Journal of Marine Science and Technology Vol. 19 No. 1 2019 31 40 DOI https 1859-3097 19 1 10376 https jmst Impact of the works on the change in coastline of Tra Vinh province Nguyen Thi Mong Lan1 Nguyen Hoang Nguyen1 Huynh Mai Ly1 Le Huu Tuan2 Vo Thi Hong Quyen1 1 Ho Chi Minh city Institute of Resources Geography VAST Vietnam 2 University of Science Vietnam National University Ho Chi Minh city Vietnam E-mail ntmlan@ Received 26 June 2017 Accepted 26 December 2017 2019 Vietnam Academy of Science and Technology VAST Abstract The coastline of Tra Vinh about 65 km long from the mouth of Cung Hau to Dinh An is composed of loose sediment which is easily affected by natural factors and human activities. Based on satellite image analysis combined with survey and field measurements the changes in coastline between 1966 and 2014 were identified. The results show that in this period the coastline had an average deposition rate of about 5 10 m year. Dong Hai was the strongest deposition area with maximum rate of 40 m year average 28 30 m year. The eroded coastline alternated with an average erosion rate of about 5 8 m year. From 1990 up to now many human constructions have been carried out along the coast of Tra Vinh contributing to the impact of changing the shoreline. In the area of My Long Nam Dong Hai and Long Vinh the mangrove planting project was performed which helped to create continuous accretion of coastline with average rate of 17 33 m year. In the period of 2009 2014 sea dykes in Hiep Thanh commune and Con Truong Truong Long Hoa commune were built to prevent coastal erosion. During 2009 2014 Hiep Thanh coast and Truong Long Hoa coast were eroded at an average rate of 8 20 m year and 6 10 m year respectively. After appearance of the dykes the survey results show that in the 2014 2015 period the shoreline of Hiep Thanh and Con Trung which has sea dykes was no longer eroded but the adjacent coastline was