bài viết tiến hành nghiên cứu khu vực cửa Nhật Lệ (Quảng Bình) nhưng những nghiên cứu này chưa thực sự tập trung vào mô phỏng đặc điểm của trường thủy động lực của khu vực này. Nghiên cứu này sẽ trình bày khả năng ứng dụng mô hình toán để mô phỏng trường thủy động lực cho khu vực cửa Nhật Lệ, Quảng Bình thông qua xây dựng bộ mô hình MIKE 21 dựa trên cơ sở dữ liệu thực đo do Trung tâm Động lực học- Thủy khí- Môi trường thực hiện năm 2018. | VNU Journal of Science Earth and Environmental Sciences Vol. 37 No. 1 2021 1-15 Original Article Simulation of the Hydrodynamic Field in Nhat Le Estuary Quang Binh Province Nguyen Xuan Loc Dang Dinh Duc Tran Vinh Quang VNU University of Science 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Received 17 September 2019 Revised 29 August 2020 Accepted 31 August 2020 Abstract Hydrodynamic field is the primary research problem of all studies on coastal estuarine areas. Over the years there have been many studies on Nhat Le estuary s region Quang Binh . Still these studies have not focused on simulating the characteristics of the hydrodynamics of this area. This study presents the ability to apply a mathematical model to simulate hydrodynamic fields for the region of Nhat Le estuary and Quang Binh sea by constructing the MIKE 21 model set based on the actual measurement database by the Center for Environmental Fluid Dynamics implemented in 2018. Through the calculation scenarios under different conditions the longshore current mainly consists of Southeast - Northwest especially with NE waves the current direction is Northwest - Southeast with current speed mostly in the range of - m s. In estuarine areas river flows have complicated developments including many component flows. In the dry season the river flow is not strong and is dominated by changes in the tide phase withdrawal in a day. There are days of high flood flow in the flood season overwhelming the tidal currents the maximum flow velocity at the door can reach more than 6 m s. Waves in the southwest monsoon season are relatively small about - m while the waves in the Northeast monsoon season are quite large and very strong during the storm but when the depth is about -3 to -4 m the wave height decreases sharply spreading to the door. In particular when there are floods in the river the waves that propagate through this depth will almost calm. Keywords Nhat Le estuary hydrodynamics simulation. _ .
