CAJ | 학술논문

通过二维数值模拟研究了位于英国西北海岸的利物浦湾在潮汐单独作用下的水动力以及泥沙输运情况.使用开源软件TELEMAC, 在对模型的源程序进行修改以后能够根据研究需要定制边界条件和初始条件.模型采取输入精简法对利物浦湾中长期的潮汐状况进行分类, 并对每种潮汐作用下的水动力与泥沙输运分别进行对比和分析, 最终确定了对利物浦湾的泥沙输运最相关的潮汐作为代表潮汐, 进而简化了潮汐作用下地形演变的长期计算.研究表明, 利物浦湾内河口海岸的水动力在潮汐作用下主要表现为非对称的涨落潮过程, 而泥沙输运会受到非对称潮汐和当地地形的显著影响.此外, 河口宽度和当地地形还会影响涨落潮的潮位和流速.潮差还会改变涨落潮流速、转流时间、输沙强度和输沙范围.
통과이유수치모의연구료위우영국서북해안적리물포만재조석단독작용하적수동력이급니사수운정황.사용개원연건TELEMAC, 재대모형적원정서진행수개이후능구근거연구수요정제변계조건화초시조건.모형채취수입정간법대리물포만중장기적조석상황진행분류, 병대매충조석작용하적수동력여니사수운분별진행대비화분석, 최종학정료대리물포만적니사수운최상관적조석작위대표조석, 진이간화료조석작용하지형연변적장기계산.연구표명, 리물포만내하구해안적수동력재조석작용하주요표현위비대칭적창락조과정, 이니사수운회수도비대칭조석화당지지형적현저영향.차외, 하구관도화당지지형환회영향창락조적조위화류속.조차환회개변창락조류속、전류시간、수사강도화수사범위.
In order to understand the influence of tide on sand exchange between an estuary and adjacent coastal region, three estuaries around North West England were chosen for detailed study using an open-source numerical morphological model system, TELEMAC. The source code of model was modified to customize tidal conditions and bed sand sizes. An "input- reduction" method was used to model sediment transport under several tides. "Morphological representative tide" was further achieved for long-term morphological modelling. It is clear that the dominant hydrodynamic processes of an estuary are influenced by tidal asymmetry. Local sediment transport is affected by seabed bathymetry and tidal asymmetry. Furthermore, shape and bathymetry of an estuary can influence tidal elevation and velocity. Tidal range can change transportation of the tidal wave which further changes the range of sediment transport.