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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Seasonal variation of river and tide energy in the Yangtze estuary, China
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Seasonal variation of river and tide energy in the Yangtze estuary, China

机译：长江口河水和潮汐能的季节变化

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In many large estuaries there are significant variations in flow conditions due to the interaction between tide (with spring-neap changes) and river discharge (with wet-dry seasons), which is key to understanding the evolution of the morphology and the resultant equilibrium state. To explore whether there exists an equilibrium state, and what might control such a state in such a dynamic environment, both numerical and analytical methods have been used to investigate the relative importance of tide and river contributions to the work done locally and globally over a wide range of discharge conditions in the Yangtze estuary. In particular, we have quantified the contributions from the tidal flow, the river flow and the tide-river interaction in terms of energy and its dissipation under different river discharge conditions. Model results suggest that there is a state of minimum tidal work for the case representing the wet season, when river and tide are doing uniform work locally and minimum work globally, within the bi-directional tidal reach for tide and along the whole estuary for river. We also observe that the system is not optimized for other conditions (peak discharge and low flows during the dry season), but the system would tend to do the minimum work possible given the constraints on the system (e.g. imposed forcing conditions and available sediment supply). Results, therefore, are consistent with the use of these two energetic optimization principles, and the proposed method could be applicable to other alluvial estuaries. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：在许多大型河口，由于潮汐（春季变化）和河水排放（干湿季节）之间的相互作用，水流条件存在显着变化，这对于理解形态演化和最终的平衡状态至关重要。为了探索是否存在平衡状态，以及在动态环境中可能控制这种状态的因素，数值和分析方法都被用于调查潮汐和河流对大范围本地和全球所做工作的相对重要性。长江口的排放条件范围。特别是，我们在能量和其在不同河流排放条件下的耗散方面，定量了潮汐流，河流流量和潮河相互作用的贡献。模型结果表明，在代表潮季的情况下，当河流和潮汐局部进行统一工作，而在双向潮汐范围内以及整个河口沿河进行局部工作时，则处于最低潮汐状态。 。我们还观察到，该系统并未针对其他条件（干旱季节的峰值流量和低流量）进行优化，但是在系统受到限制的情况下（例如强加于强迫条件和可用的沉积物供应），该系统可能会尽可能地减少工作量。 ）。因此，结果与这两种能量优化原理的使用是一致的，并且所提出的方法可以适用于其他冲积河口。版权所有（c）2015 John Wiley＆Sons，Ltd.

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