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首页> 外文期刊>Estuarine Coastal and Shelf Science >Finger-like plumes of suspended sediment in the Colorado River Delta, Gulf of California
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Finger-like plumes of suspended sediment in the Colorado River Delta, Gulf of California

机译：Colorado River Delta，加利福尼亚州海湾的悬浮沉积物的指状羽毛

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The present investigation focused on solving the significance of tidal currents in the sediment resuspension process revealed by satellite imagery in the tidal basin of the Colorado River Delta, located in the northernmost part of the Gulf of California. A depth-integrated finite difference hydrodynamic model, coupled with a suspended sediment transport module, has been applied to calculate the velocity field and potential suspended sediment changes in the delta region. Prescribed values of tidal harmonics were used to force the model at the open boundary of the model domain. The experiments revealed that sediment plumes are generated by the interaction of the tidal flow and the seabed, exposing a remarkable agreement between the crest of sandbanks existing in the delta and the potential sediment resuspension. Close to spring tides, the instantaneous potential transport of sediment in suspension reaches values up to 0.05 m(3), integrated over each cell of 280 m x 280 m. The calculations showed that in the shallow coastal area at the gulfs head, sandbank presence is critical for the energy dissipation processes. The crests of sandbanks dissipate much of the energy. The simulated processes are strong evidence that the frictional effect of tidal flow during the initial stages of the spring tides contributes significantly to the sediment's picking up from the seabed going into suspension. These processes shape the plumes of suspended sediment, which extended in the same direction as the sandbanks. Comparison between satellite imagery and modeled distribution of sediment revealed a good agreement between observed and modeled finger-like plumes of sediment. The undulating topography's effect is reflected in the horizontal distributions of energy dissipation, current speed, and kinetic energy.
机译：本研究侧重于解决卫星盆地潮汐盆地潮汐地区潮汐地区潮汐盆地潮汐盆地潮汐盆地，位于加利福尼亚州湾最北端的潮汐盆地中展开的潮汐盆地的意义。已经应用了与悬浮沉积物传输模块的深度集成有限差分流体动力学模型，以计算速度场和潜在的悬浮沉积物在Delta区域中的变化。使用规定的潮谐波值来强制模型域的开放边界处的模型。实验表明，沉积物羽线是通过潮流和海底的相互作用产生的，暴露在三角洲存在的沙袋嵴和潜在的沉积物重新悬浮在潜在的沉积物之间存在显着达成。接近春季潮汐，悬浮液中沉积物的瞬时潜在运输达到0.05米（3）的值，整合在280m×280μm的每个电池上。计算表明，在海湾头部的浅沿海地区，Sandbank的存在对于能量耗散过程至关重要。沙洲的冠冕散发了大部分能量。模拟过程是强有力的证据表明春季潮汐初始阶段期间潮流的摩擦效应对沉积物从海底悬浮液中的拾取产生了贡献。这些工艺塑造悬浮沉积物的羽毛，其沿与砂磨机相同的方向延伸。卫星图像与沉积物的建模分布之间的比较揭示了观察和模型的沉积物之间的良好一致性。起伏的地形效果反映在能量耗散，电流速度和动能的水平分布中。

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