一线模型在黄河口岸线预报中的应用

建立了一种能够模拟黄河口海洋与河流混合动力作用模式下黄河口岸线淤积、延伸、侵蚀规律的一线数学模型。采用了反映岸线侵蚀重要因素的波浪破碎模型,并引入黄河径流挟带泥沙沿岸输沙率分布计算,不但提高了波浪计算的精度,也真实反映了黄河口门附近岸线演变现象的物理机制。研究结果表明,黄河口径流挟带的大量泥沙受到水流动力轴线影响,泥沙沿岸线的淤积是黄河口门附近岸线演变的重要因素之一。验证试验表明,模型计算结果与实测值吻合很好,可以用于黄河口岸线演变的预报计算。

Study of One-Line Model for Shoreline Change in Yellow River Estuary

A one-line mathematic model has been set up,which can simulate the pattern of siltation,extension and erosion of the shorelines in the Yellow River Estuary under the mixed dynanic action of seas and rivers in the Yellow River Estuary.A wave-breaking model reflecting shoreline erosion has been incorporated into the model and the distribution of littoral movement rate with sediment loads carried by the runoffs of the Yellow River has also been incorporated in the calculation,thus not only improving the accuracy of wave and tide calculations but also truly reflecting the physical mechanism of the shoreline evolution close to the Yellow River Estuary.The results of the study show that the large sediment load,carried by the Yellow River runoffs,is affected by the dynamic axis of flow and settles down along the shorelines,which is one of important factors for the shoreline evolutoin close to the Yellow River Estuary.Verification tests show that the modeled results fit well with the measured values and may be used for precasting the shoreline change in the Yellow River Estuary.