선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- Also, in order to take into account the Coriolis force caused by the rotation of the Earth, 34˚45’ north latitude (the central part of the calculated area) was entered.
- In order to figure out the behavior of low salinity water caused by the freshwater inflow in the Yeongsan River Estuary, this study predicted the salinity distribution using the EFDC model and reviewed the results. Experiment was fulfill by divided to before and after tidal gate extension and investigated low salinity water expansion pattern until reaching to the quasistationary state after 0hour, 2 hours, 1 day, 2 days, 7 days, and 16 days passed up to 16days(45days after fulfilling model) in the state of no discharge from the last discharge time after 30days of model fulfillment.
- In order to figure out the behavior of low salinity water caused by the freshwater inflow in the Yeongsan River Estuary, this study predicted the salinity distribution using the EFDC model and reviewed the results. Experiment was fulfill by divided to before and after tidal gate extension and investigated low salinity water expansion pattern until reaching to the quasistationary state after 0hour, 2 hours, 1 day, 2 days, 7 days, and 16 days passed up to 16days(45days after fulfilling model) in the state of no discharge from the last discharge time after 30days of model fulfillment.
- 301, 321, and 342 (source: Korea Hydrographic and Oceanographic Administration) were used. The calculation was carried out every 4 seconds for 17 days, and after verification it was carried out for 45 days in order to figure out the behavior of low salinity water. The target sea area is the Yellow Sea that includes the Mokpo Port, Hwawon Peninsula, and Yeongam Peninsula, where tidal currents are dominant.
- The experiment was carried out before and after the expansion of the tidal gate during the flood season and normal season. The volume of freshwater inflow was entered as shown in Table 1, based on 13 years’ worth of operation data of the tidal gate.
- In the viewpoint, many researches on marine environment and ecology change of Yeongsan-river estuary were fulfilled but researches on the most basic low salinity water behavior influencing greatly the marine environment weren’t accomplished much. Therefore, the study, by using 3 dimensional hydromechanics model, EFDC, predicted range of low salinity expansion by fresh water inflow before and after tidal gate extension in a flood season when fresh water inflow is the most and investigated low salinity water behavior as time passed.
- To check how well the hydrodynamic model had simulated the present state, the tidal current values of the model cells that corresponded with the location of the observed values were verified using the time series verification of the east-west and north-south velocity components. This is shown in Table 5.
대상 데이터
- The calculation was carried out every 4 seconds for 17 days, and after verification it was carried out for 45 days in order to figure out the behavior of low salinity water. The target sea area is the Yellow Sea that includes the Mokpo Port, Hwawon Peninsula, and Yeongam Peninsula, where tidal currents are dominant. Therefore, for the tides along the open boundary, the harmonic constant from data published by the Korea Ocean Research and Development Institute was used: the amplitude and phase of M2, S2, K1, and O1 harmonic constituents were calculated for each of the 59 cells that make up the western boundary, and these values were then entered.
데이터처리
- In order to quantitatively estimate the accuracy of the model’s results, the absolute relative error (ARE) and error were calculated for both the calculated and the observed results.
이론/모형
- The EFDC (Environmental Fluid Dynamics Code) model was used to simulate the movement of seawater in the target waters and to predict the behavior of low salinity water. EFDC was developed by Virginia Institute of Marine Science (Hamrick, 1992) and is a multivariate, finite difference model that can simulate two-and three-dimensional movement of seawater and substances.
- A 240-square-kilometer sea area that included the intertidal zone was set as the basic target area of the model. The calculation grid used by the model was Seagrid, which is based on the Curvilinear-orthogonal grid system. Horizontally, a Curvilinear-orthogonal grid with a mean deviation of 1.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.