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Efficient dredging strategy in a tidal inlet based on an energetic approach

机译：基于能量方法的潮汐进口高效疏strategy策略

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Despite relevant advances in the study of inlet morphodynamics during the last decades, there is still a lack of knowledge regarding the effects of dredging interventions into these systems and their role into the mid-term stability. In this work the case of Punta Umbria, a deeply human-altered inlet in Southwestern Spain, was studied. To ensure the operational capacity and safe navigation throughout the inlet, five dredging works have been done since 2002, according to three alternative navigation channels designs. Given the siltation of the dredged channels and their associated high economic and environmental impacts, regional managers are demanding a more efficient alternative in time with a longer life cycle. The objective of this study is to relate the observed morphological activity to the forcings' dynamics to quantitatively assess the morphodynamic response of the tidal inlet. To this purpose, 18 high resolution bathymetries of the inlet were analyzed in order to compute the morphological activity of the bed. The Delft3D numerical model was implemented to reproduce the total energy flux, obtained as the sum of both tidal and wave energy fluxes. The model was then calibrated and validated with hydrodynamic measurements from a monitoring network. Results show that the spatial divergence of the total energy flux explains the observed morphological activity patterns in the inlet, where locations with larger sedimentation correspond to those with higher convergence in the total energy flux. Through the reduction of the bed slope a more efficient design was obtained, since it minimizes the divergence of the energy fluxes and hence the bed activity, in contrast to former channel designs. This methodology can be extended to other systems, and therefore improve the efficiency in time of dredging interventions in tidal inlets. (C) 2017 Elsevier Ltd. All rights reserved.
机译：尽管最近几十年来在进气道形态动力学研究方面取得了相关进展，但仍缺乏有关疏通这些系统干预措施的效果及其对中期稳定性的作用的知识。在这项工作中，研究了西班牙西南部一个人为改变深深的入口Punta Umbria的情况。为了确保整个入口的运行能力和安全导航，根据三种替代性导航通道设计，自2002年以来已进行了五次疏dr工程。鉴于疏channels渠道的淤积及其相关的重大经济和环境影响，区域经理要求及时提供更有效的替代方案，并延长使用寿命。这项研究的目的是将观察到的形态活动与强迫的动力学联系起来，以定量评估潮汐进口的形态动力响应。为此，对入口的18个高分辨率水深进行了分析，以计算床的形态活动。实施了Delft3D数值模型来再现总能量通量，该总能量通量是潮汐和波浪能通量之和。然后对模型进行校准，并使用来自监控网络的流体动力学测量结果进行验证。结果表明，总能量通量的空间差异解释了入口处观察到的形态活动模式，其中沉积较大的位置对应于总能量通量较高的位置。与以前的通道设计相比，由于减小了床坡度，因此获得了更有效的设计，因为它使能量通量的发散最小，从而使床的活动性最小。该方法可以扩展到其他系统，因此可以提高潮汐口疏dr干预的效率。 （C）2017 Elsevier Ltd.保留所有权利。

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