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首页> 外文会议>IAHR World Congress >INFLUENCE OF THE RIVER MOUTH GEOMETRY ON THE MORPHOLOGICAL EVOLUTION OF RIVER MOUTH BARS: IMPORTANCE OF WATER INTAKE ANGLE AND BASIN BOTTOM SLOPE
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INFLUENCE OF THE RIVER MOUTH GEOMETRY ON THE MORPHOLOGICAL EVOLUTION OF RIVER MOUTH BARS: IMPORTANCE OF WATER INTAKE ANGLE AND BASIN BOTTOM SLOPE

机译：河口几何对河口杆形态演化的影响：水进口角度和盆地底坡的重要性

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Sediment delivery from rivers to open sea is the fundamental transfer mechanism for continental sedimentation with implication for many social, economic and ecological activities. Many estuaries in southern Spain are having problems due to strong sedimentation both at the navigation channel and at the river mouth, forcing to periodic dredging operations to maintain the inlet depth. Hence it is still necessary to better understand the processes that govern the formation of mouth bars in front of rivers debouching into the sea, since they play a key role for the delta and coastline configuration. Although many works during last decades analyzed the effects of factors such as tides, wind waves or sediment properties, the control that the geometrical configuration of the river mouth exerts on the sedimentary processes remains unclear. In this work, extensive numerical simulations have been performed using Delft3D, a coupled hydrodynamic and morphodynamic numerical model, to simulate the processes of river mouth bar formation within a sheltered bay in the absence of tides and waves. Keeping all other factors constant, we find that varying the water intake angle and the receiving basin bottom slope, the behaviour of the turbulent jet is modified by changing its direction, spreading rate and stability. This change in the hydrodynamic conditions has significant consequences in the configuration of the river mouth bar. From the numerical results we establish a theoretical framework for the specific morphology of the mouth bar as a function of the river outlet geometry. Hence, our results highlight the importance of this outlet geometry in the morphodynamic evolution of river mouths and should be considered for properly designing managing strategies.
机译：从河流开放海洋的沉积物是大陆沉积的根本转移机制，对许多社会，经济和生态活动的影响含义。由于在导航频道和河口的沉积物中，西班牙南部的许多河口都存在问题，迫使疏浚操作以保持入口深度。因此，它仍然是必要的，以便更好地理解治理河流延伸出入海前的河口坝形成的过程，因为他们玩的三角洲和海岸线配置的关键作用。虽然在过去十年中的许多作品分析了潮汐，风波或沉积物特性等因素的影响，但对河口的几何配置对沉积过程施加的控制仍然尚不清楚。在这项工作中，使用Delft3D，耦合的流体动力学和形态学数值模型进行了广泛的数值模拟，以模拟在没有潮汐和波浪的情况下在遮蔽湾内的河口杆形成过程。保持所有其他因素常数，我们发现改变水进气角和接收盆底底斜率，通过改变其方向，扩散速率和稳定性来改变湍流射流的行为。流体动力学条件的这种变化在河口杆的配置中具有显着的后果。从数值结果来看，作为河流出口几何形状的嘴巴特定形态的理论框架。因此，我们的结果突出了这个出口几何形状在河口的形态学演变中的重要性，并且应考虑正确设计管理策略。

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