การศึกษาการเปลี่ยนแปลงลักษณะพื้นท้องน้ำตามฤดูกาล บริเวณปากแม่น้ำปราณบุรี จังหวัดประจวบคีรีขันธ์ ด้วยแบบจำลองทางคณิตศาสตร์

• 主要作者: จิราภา อังศุวรพฤกษ์
• 其他作者: สุริยัณห์ สาระมูล
• 格式: Senior Project
• 語言: Thai
• 出版: จุฬาลงกรณ์มหาวิทยาลัย 2020
• 主題: ตะกอนแม่น้ำ > แม่น้ำปราณบุรี; แบบจำลองทางคณิตศาสตร์; River sediments > Pranburi River; Mathematical models
• 在線閱讀: https://digiverse.chula.ac.th/Info/item/dc:10789
• 機構: Chulalongkorn University

The study of seasonal bathymetry changes in Pranburi River Mouth, Prachuap Khiri Khan Province was investigated using a couple Delft3D-FLOW and Delf3D-WAVE model. In this study, 4 physical factors affecting bathymetry change tides, wind, wave and river discharge were taken into consideration. The model domain was divided into 2 areas. The large domain covered from Hua Hin to the main Ko Lak, while the small domain, nested from large domain will cover Pranburi River Mouth. Model grid resolution of hydrodynamic and wave models for large domain were respectively 20x20 and 40x40 m². While the grid resolution of nested model (small domain) was half of the large domain. Water level nested from large model domain was applied at eastern boundary of small model domain. Variable winds were forced at the surface and river discharge was applied at Pranburi River. Form the model study, it was found that south of Jetties was the place where bathymetry change mostly occurred, Sediments were carried from the river mouth to the area near Jetties. While in offshore area, there existed erosion and sedimentation. Shoreward direction toward south jetties of wave size of approximately 0.33 m during northeast monsoon may cause these changes. On the other hands, during southwest monsoon bathymetry was rarely altered due to small wave height (less sediment transport). In conclusion, bathymetry changes based on model simulation in Pranburi River Mouth was dominantly controlled by northeast monsoon wave and river discharge, while tides was co-factor.