Coastal Engineering最新文献_第8页

Laboratory investigation of solitary wave interactions with mangrove seedlings in hexagonal planters 六角形种植槽中红树林幼苗与孤立波相互作用的实验室研究

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-09-01 DOI: 10.1016/j.coastaleng.2025.104858

Yushu Xie, Jiarui Lei

The integration of engineered and natural elements, known as hybrid solution, combines physical protection with ecological benefits for coastal defense. This study evaluates the performance of a hexagonal concrete planter designed to shelter mangrove seedlings under wave attack. Laboratory experiments measuring wave heights, fluid velocities, and forces on seedlings were conducted to investigate the mechanical behaviour of this hybrid solution. Results show that the concrete planters effectively dissipate wave energy, with the contribution of mangrove seedlings to wave attenuation is negligible due to their small density. Among various parameters, water submergence is identified as the most important factor influencing wave transmission. The planter's presence alters the surrounding flow field by increasing horizontal flow velocity near the seedlings' upper portions; however, force measurements demonstrate that the planter significantly reduces the hydrodynamic force exerted on the seedlings by lowering flow velocity within its interior. To account for the altered velocity field, a modification coefficient is proposed to predict the depth-averaged velocity near the hybrid solution. This modified velocity approach yields accurate force predictions under low submergence conditions, but significant deviations occur at high submergence, mainly due to the bending of mangrove seedlings. Overall, this study highlights the planter's effectiveness in reducing forces on seedlings and attenuating wave energy. The findings provide valuable insights into hydrodynamic interactions between hybrid solutions and incoming waves. Additionally, the presented results offer practical guidance for designing and deploying concrete planters, bridging the gap between academic research and engineering applications.

工程与自然元素的融合，即所谓的混合解决方案，将物理保护与生态效益相结合，以实现海防。本研究评估了一个六角形混凝土花盆的性能，该花盆设计用于保护红树林幼苗免受波浪攻击。实验室实验测量波高、流体速度和对幼苗的力，以研究这种混合溶液的力学行为。结果表明，混凝土种植体能有效地耗散波浪能，红树林幼苗由于密度小，对波浪衰减的贡献可以忽略不计。在各种参数中，水深是影响波浪传播最重要的因素。播种机的存在通过增加幼苗上部附近的水平流速来改变周围的流场；然而，力测量表明，播种机通过降低其内部的流速，显着降低了施加在幼苗上的水动力。为了考虑速度场的变化，提出了一种修正系数来预测混合解附近的深度平均速度。这种修正的速度方法在低淹没条件下得到了准确的力预测，但在高淹没条件下出现显著偏差，主要是由于红树林幼苗的弯曲。总的来说，这项研究强调了播种机在减少对幼苗的力和衰减波能方面的有效性。这一发现为混合溶液与入射波之间的流体动力学相互作用提供了有价值的见解。此外，所提出的结果为设计和部署混凝土种植提供了实用指导，弥合了学术研究和工程应用之间的差距。

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引用次数: 0

Energetics analysis of solitary waves using a multi-layer model 用多层模型分析孤立波的能量学

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-30 DOI: 10.1016/j.coastaleng.2025.104868

Hunter Boswell , Frank D. Han , Guirong Yan , Wouter Mostert

This study investigates the performance of a vertically-Lagrangian multi-layer model on numerically simulating shoaling and breaking two-dimensional solitary waves during both the breaking and post-breaking processes. The energy dissipation of the breaking event for the multi-layer waves is analyzed and compared to prior direct numerical simulation work with the same bathymetric and wave cases. It shows very similar data collapse to shallow-water inertial theory. For post-breaking behavior, bore characteristics are compared to an experimental study of bores formed from breaking solitary waves and similar results are found. While the multi-layer method was not found to behave sufficiently well for direct force measurement at a vertical wall, the resulting bore characteristic behavior is found to be sufficient for use in theoretical estimations of the impact force on the wall. These findings in this study suggest that vertically-Lagrangian multilayer models resolve propagating bores sufficiently well when trying to estimate dynamic loads on vertical seawalls with minimal model tuning.

本文研究了垂直拉格朗日多层模型对二维孤立波在破碎过程和破碎后的浅化和破碎过程的数值模拟性能。分析了多层波浪破碎事件的能量耗散，并与前人在相同水深和波浪情况下的直接数值模拟结果进行了比较。它显示了与浅水惯性理论非常相似的数据崩溃。对于破碎后的行为，将孔的特征与破碎孤立波形成的孔的实验研究进行了比较，发现了相似的结果。虽然多层方法不能很好地用于垂直壁面的直接力测量，但由此产生的孔特性行为足以用于对壁面冲击力的理论估计。本研究的这些发现表明，当试图估计垂直海堤上的动态载荷时，垂直拉格朗日多层模型可以很好地解决传播钻孔的问题，只需最小的模型调整。

引用次数: 0

Numerical study of wave-structure interactions with porous artificial reefs using Smoothed Particle Hydrodynamics 基于光滑粒子流体力学的多孔人工鱼礁波构相互作用数值研究

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-30 DOI: 10.1016/j.coastaleng.2025.104871

Jianjun Huang , Ryan J. Lowe , Marco Ghisalberti , Jeff E. Hansen , Corrado Altomare

Porous artificial reefs are increasingly being used for nature-based coastal protection, given their ability to attenuate waves while providing habitat for marine species. The wave attenuation and ecological functions of porous artificial reefs depend on how wave-driven flows interact with the porous interior structure of a reef; however, these hydrodynamic processes are still relatively poorly understood. To overcome the challenges with resolving the detailed flow-structure interactions within porous artificial reefs at fine (order mm) spatial resolution, this study utilized a mesh-free Computational Fluid Dynamics modelling approach based on Smoothed Particle Hydrodynamics (SPH) using the DualSPHysics solver. The capability of the SPH model to accurately reproduce the reef hydrodynamics (including wave transformation, hydrodynamic forces acting on the structure, and drag and inertia coefficients) was first validated against three independent experimental datasets of wave-structure interactions. The model was then used in a two-dimensional (2D) numerical investigation of wave-structure interactions with porous artificial reefs, where the 3D geometric parameters of the reef structure were adjusted within the 2D model to properly account for the hydrodynamic forces within the reef (i.e., using a quasi-3D approach). The results reveal how the porous reefs modify the dynamics of wave-induced oscillatory flows within the reef structure that are responsible for generating horizontal and vertical drag forces, wave dissipation, turbulent kinetic energy, and mean currents. Drag coefficients decreased with the Keulegan-Carpenter number, with vertical drag coefficients typically larger than horizontal values. Wave dissipation across the porous reefs was due to a combination of horizontal drag forces and wave breaking, with vertical drag forces playing only a secondary role. Compared to less porous structures, the enhanced drag dissipation in porous artificial reefs enables them to attenuate waves more effectively over a greater range of water levels. Finally, the findings of this study underscore the potential for SPH models to be used as a cost-effective tool to support the design of porous artificial reefs for coastal protection.

多孔人工珊瑚礁越来越多地用于基于自然的海岸保护，因为它们能够减弱海浪，同时为海洋物种提供栖息地。多孔人工鱼礁的波浪衰减和生态功能取决于波浪驱动流与多孔鱼礁内部结构的相互作用；然而，人们对这些流体动力学过程仍然知之甚少。为了克服在精细（毫米级）空间分辨率下解决多孔人工鱼体内详细的流动-结构相互作用的挑战，本研究使用了基于光滑粒子流体动力学（SPH）的无网格计算流体动力学建模方法，使用dualspphysics求解器。SPH模型能够准确地再现珊瑚礁的水动力（包括波浪变换、作用在结构上的水动力、阻力和惯性系数），并首先通过三个独立的波-结构相互作用实验数据集进行验证。然后将该模型用于多孔人工鱼礁的波浪-结构相互作用的二维（2D）数值研究，其中在二维模型中调整了鱼礁结构的三维几何参数，以适当地考虑鱼礁内部的水动力（即使用准三维方法）。研究结果揭示了多孔礁体如何改变礁体结构中波浪诱导的振荡流动动力学，这些振荡流动负责产生水平和垂直阻力、波浪耗散、湍流动能和平均电流。阻力系数随着Keulegan-Carpenter数的减小而减小，垂直阻力系数通常大于水平阻力系数。波浪在多孔礁体上的耗散主要是由于水平阻力和波浪破碎的共同作用，垂直阻力仅起次要作用。与多孔性较少的结构相比，多孔人工鱼礁的阻力耗散增强使它们能够在更大的水位范围内更有效地衰减波浪。最后，本研究的结果强调了SPH模型作为一种具有成本效益的工具来支持设计用于海岸保护的多孔人工鱼礁的潜力。

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引用次数: 0

Numerical modelling of nearshore wave transformation, breaking and overtopping of coastal protections with the enhanced Serre–Green–Naghdi equations 基于改进Serre-Green-Naghdi方程的近岸波浪变换、破碎和堤岸过顶数值模拟

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-29 DOI: 10.1016/j.coastaleng.2025.104857

Guillaume Coulaud , Maria Teles , Michel Benoit

Admissible average overtopping discharges in given storm conditions are typically used to design coastal protections, in particular dykes or breakwaters. These discharges are usually estimated using semi-empirical formulas relying on wave conditions at the toe of the structure. These formulas, unfortunately, only work for simple configurations, invariant alongshore, and can be insufficient for complex sea states. Therefore, numerical modelling could be a more flexible alternative for estimating these discharges. This work presents the development and validation of a Boussinesq-type numerical model solving the fully-nonlinear weakly-dispersive enhanced Serre–Green–Naghdi equations for the simulation of random wave overtopping over impermeable structures in one horizontal dimension. Wave breaking is modelled with an eddy viscosity approach based on the turbulent kinetic energy, which is robust and accurate at describing energy dissipation in the surf zone. Two distinct experimental datasets, with 184 trials in total and very dissimilar wave conditions and foreshore seabed profiles, are used to validate the model regarding wave propagation, shoaling, breaking and overtopping. Both unimodal and bimodal sea states are considered. Average overtopping discharges in configurations with deep and very shallow foreshores, as well as for breaking and non-breaking waves, are well reproduced by the model. For instance, typical mean relative errors on the simulated mean overtopping rates are found to lie within

\pm 20 %

compared with the measurements, at least for the largest discharges of the considered campaigns. The scatter of simulated discharges is somewhat higher for lower discharges, but the results remain in an acceptable range.

在给定风暴条件下允许的平均溢水流量通常用于设计海岸保护，特别是堤防或防波堤。这些流量通常使用半经验公式来估计，该公式依赖于结构趾部的波浪条件。不幸的是，这些公式只适用于简单的配置，岸线不变，对于复杂的海况可能不够。因此，数值模拟可能是估计这些排放的更灵活的替代方法。这项工作提出了一个求解全非线性弱色散增强Serre-Green-Naghdi方程的boussinesq型数值模型的发展和验证，该模型用于在一个水平维度上模拟不透水结构上的随机波过顶。波浪破碎采用基于湍流动能的涡流黏度方法进行建模，该方法在描述海浪区能量耗散方面具有鲁棒性和准确性。两个不同的实验数据集，共184次试验，波浪条件和前海岸海底剖面非常不同，用于验证波浪传播，浅滩，破碎和溢出的模型。考虑了单峰海况和双峰海况。模型很好地再现了深前滩和极浅前滩构型以及破碎波和非破碎波的平均过顶流量。例如，与测量值相比，模拟的平均溢出率的典型平均相对误差在±20%以内，至少对于所考虑的运动的最大排放。对于较低的放电，模拟放电的散射值略高，但结果仍在可接受的范围内。

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引用次数: 0

Runup, inundation, and flow velocity of non-decaying dam-break bores on coarse-grained slopes 粗粒坡上未腐烂溃坝孔的涌流、淹没和流速

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-23 DOI: 10.1016/j.coastaleng.2025.104860

Yu Hsiao , Yun-Ta Wu

This study investigates the swash flows generated by non-decaying dam-break bores traveling over permeable coarse-grained and impermeable beaches. Experiments were conducted to measure runup height, inundation depth, flow velocity, and variations in groundwater. The experiments covered a wide range of bore strengths, which is beneficial for systematically examining bore hydrodynamics, including their effects on runup and inundation. Then, comparisons were extended to the measured results on permeable and impermeable slopes. In this context, empirical formulations, originally developed for smooth and rough impermeable slopes, were refined with reduction factors derived from measurements on coarse-grained beaches, thus allowing for quantifying beach permeability effects. The reduction factors derived from the measured runup heights and inundation depths demonstrated a dependency on the bore types. Velocity fields within the surf and swash zones were captured using time-resolved particle image velocimetry, from which bed shear stresses were subsequently calculated. Four distinct stages of flow behavior were identified: uprush, first downrush, stagnant phase, and second downrush. During the flow reversal phase, it was observed that velocities near the bed reversed direction sooner than those nearer to the free surface, a phenomenon attributed to the boundary layer effect. In permeable slope cases, exfiltration processes became significant during the latter two stages of swash motion. The bed shear stresses, estimated using two distinct formulations, generally exhibited comparable trends. The mechanisms governing groundwater flow also differed between the two permeable beach types: on the gravel slope, bore-induced infiltration advances laterally and rapidly merges with the groundwater level; on the coarse sand beach, infiltration was primarily driven by gravitational drainage during the uprush phase.

本研究探讨了未腐烂的溃坝孔在可渗透的粗粒和不渗透的海滩上行进时产生的冲刷流。实验测量了上升高度、淹没深度、流速和地下水的变化。试验涵盖了广泛的钻孔强度，这有利于系统地研究钻孔水动力学，包括它们对冲刷和淹没的影响。然后，将比较扩展到透水和不透水边坡的实测结果。在这种情况下，最初为光滑和粗糙的不透水斜坡开发的经验公式，通过对粗粒度海滩的测量得出的减少因子进行了改进，从而可以量化海滩渗透性的影响。由测量的上升高度和淹没深度得出的减小系数与钻孔类型有关。利用时间分辨粒子图像测速技术捕获了冲浪带和冲刷带内的速度场，并由此计算出床层剪应力。确定了四个不同阶段的流动行为：上冲、第一次降冲、停滞阶段和第二次降冲。在流动反转阶段，观察到靠近床层的速度比靠近自由表面的速度更快反转，这一现象归因于边界层效应。在渗透性边坡情况下，在冲刷运动的后两个阶段，渗漏过程变得明显。用两种不同的公式估计的床层剪应力通常表现出可比较的趋势。两种透水滩地控制地下水流动的机制也不同：在砾石边坡上，钻孔诱导的渗透横向推进并迅速与地下水位融合；在粗砂滩，冲升阶段的入渗主要由重力排水驱动。

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引用次数: 0

Experimental interpretation of the seaward boundary condition parameter in dam-break induced swash models 溃坝冲刷模型中向海边界条件参数的实验解释

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-22 DOI: 10.1016/j.coastaleng.2025.104867

Zhijie Jiang , Jun Zeng , Jian Qiu , Haijiang Liu

Physical interpretation of the seaward boundary condition (SBC) parameter

k

proposed by Guard and Baldock (2007) in dam-break induced swash models is still unclear in experiments. In this study, a series of dam-break laboratory experiments were conducted to reveal such interpretation of the parameter

k

. Different nondimensional upstream reservoir lengths

L

were applied to examine the relationship between parameters

L

and

k

with respect to the temporal variation characteristics of the local water depth. It is found that time-varying histories of the nondimensional water depth are almost identical among different cases when

L

is the same (irrelevant to the initial water heads). Meanwhile, parameters

L

and

k

play analogous roles in determining the local swash features. Based on the maximum water depth, the rise time of the water depth, and its time ratio at a specified position, the one-on-one and averaged

L

-

k

relationships were established. The

L

-

k

relationship was then validated at other slope positions, confirming its applicability across the swash extension. In addition, the one-on-one

L

-

k

relationship presents better agreement between model and experiment than the averaged

L

-

k

relationship. These findings help to clarify the physical interpretation of the SBC parameter with the actual swash hydrodynamic conditions.

Guard和Baldock（2007）在溃坝冲刷模型中提出的向海边界条件（SBC）参数k的物理解释在实验中尚不明确。在本研究中，我们进行了一系列的溃坝实验室实验来揭示参数k的这种解释。应用不同的无量纲上游水库长度L来研究参数L和k与当地水深的时间变化特征之间的关系。研究发现，当L相同（与初始水头无关）时，不同情况下无量纲水深的时变历史几乎相同。同时，参数L和k在确定局部冲刷特征方面也起着类似的作用。根据最大水深、水深上升时间及其在指定位置的时间比，建立了一对一和平均的L-k关系。然后在其他斜坡位置验证了L-k关系，确认了其在整个斜坡扩展中的适用性。此外，模型与实验的一对一的L-k关系比平均的L-k关系更符合。这些发现有助于澄清SBC参数与实际斜流水动力条件的物理解释。

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引用次数: 0

Measurements and modeling of aeolian sand transport on dynamic cobble berm revetments 动力卵石护岸上风沙输运的测量与模拟

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-22 DOI: 10.1016/j.coastaleng.2025.104859

C.O. van IJzendoorn , M.E. Wengrove , P. Ruggiero , H.G. Bond

Dynamic cobble berm revetments are a nature-based adaptation solution aimed at preventing or slowing coastal erosion. Dynamic cobble berm revetments mimic natural composite beaches that consist of a low-sloping sandy beach backed by a steeper cobble slope. During high wind conditions, wind can blow sand from the sandy beach into the cobble berm. Subsequent infilling of a dynamic revetment by aeolian (wind-driven) sand transport is hypothesized to affect its morphological development and performance, e.g. by reducing wave infiltration and increasing overtopping. However, aeolian sand transport on dynamic cobble berm revetments has not yet been measured or simulated with numerical models. Here, we use event-based field measurements to show that aeolian sediment transport on dynamic revetments is dependent on the wind speed and moisture content on the beach, and that dynamic revetments can trap 93–100 % of the aeolian sand transport from the beach. Additionally, we adapt a numerical aeolian sediment transport model (AeoLiS) to replicate the physical processes, such as sediment trapping, that alter sand transport on a dynamic revetment. As a result, the modified model reproduces the timing and spatial patterns of measured aeolian transport and the sand trapping efficiency of dynamic revetments. A simulation of sand infilling on a dynamic revetment shows how sand trapping is reduced once a dynamic revetment is filled with sand. The modified model considers wind-driven sand infilling and provides a pathway for considering the combined effect of marine and aeolian processes (i.e., by coupling with a hydrodynamic model) in dynamic revetment design.

动态卵石护岸是一种基于自然的适应性解决方案，旨在防止或减缓海岸侵蚀。动态鹅卵石护坡模拟天然复合海滩，由一个低倾斜的沙滩和一个更陡峭的鹅卵石斜坡组成。在大风条件下，风会把沙滩上的沙子吹到鹅卵石护堤上。据推测，风沙输运对动力护岸的后续充填会影响护岸的形态发育和性能，例如减少波浪入渗和增加漫顶。然而，在动力卵石护岸上的风沙输运还没有被测量或用数值模型模拟。在这里，我们使用基于事件的现场测量结果表明，动态护岸上的风沙输运取决于海滩上的风速和水分含量，并且动态护岸可以捕获海滩上93% - 100%的风沙输运。此外，我们采用了一个数值风成沙输运模型（AeoLiS）来模拟改变动态护岸上沙输运的物理过程，如泥沙捕获。结果表明，修正后的模型能较好地再现实测风输运的时间和空间格局以及动力护岸的捕沙效率。对动态护岸填沙的模拟表明，一旦动态护岸填沙，捕沙量是如何减少的。修正后的模型考虑了风沙充填，为动力护岸设计中考虑海洋和风成过程的联合作用（即与水动力模型耦合）提供了途径。

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引用次数: 0

Predicting shoreline changes using deep learning techniques with Bayesian optimisation 利用贝叶斯优化的深度学习技术预测海岸线变化

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-16 DOI: 10.1016/j.coastaleng.2025.104856

Tharindu Manamperi , Alma Rahat , Doug Pender , Demetra Cristaudo , Rob Lamb , Harshinie Karunarathna

Accurate prediction of shoreline change is vital for effective coastal planning and management, especially under increasing climate variabilities. This study explores the applicability of deep learning (DL) techniques, particularly Long Short-Term Memory (LSTM) and Convolutional Neural Network-LSTM (CNN-LSTM) models, for shoreline forecasting at monthly to inter-annual timescales, under two modelling approaches—direct input (DI) and autoregressive (AR). All models demonstrated the ability to reproduce temporal shoreline variability, while the autoregressive DL models were performing better.

Further, a noise impact assessment revealed that seasonal decomposition and noise filtering significantly enhanced the model performance. In particular, the models using 52-week data decomposition and residual noise reduction improved the model performance. The reduction of data noises also resulted in narrower ensemble prediction envelopes, indicating that ensemble candidate models behave with low diversity. The temporal data resolution analysis showed that lower data resolutions reduce the predictive performance of the model and at least fortnightly data are required to satisfactorily capture the trend of variability of the shoreline position at this beach.

The use of ensemble predictions, derived from a selected subset of model trials based on their collective performance, proved beneficial by capturing diverse temporal behaviours, thereby offering a quasi-probabilistic forecast with minimal computational cost. Overall, the study underscores the potential of DL models, particularly with autoregressive architectures, for reliable and transferable shoreline change prediction. It also emphasizes the importance of data quality, resolution, and preprocessing in improving model robustness, laying the groundwork for future research into use of DL in multi-scale shoreline predictions.

海岸线变化的准确预测对于有效的沿海规划和管理至关重要，特别是在气候变化日益增加的情况下。本研究探讨了深度学习（DL）技术，特别是长短期记忆（LSTM）和卷积神经网络-LSTM （CNN-LSTM）模型，在直接输入（DI）和自回归（AR）两种建模方法下，对月至年际时间尺度的海岸线预测的适用性。所有模型都显示出再现时间海岸线变化的能力，而自回归DL模型表现得更好。此外，噪声影响评估表明，季节分解和噪声滤波显著提高了模型的性能。特别是采用52周数据分解和残差降噪的模型，提高了模型的性能。数据噪声的降低也导致集合预测包络更窄，表明集合候选模型表现出较低的多样性。时间数据分辨率分析表明，较低的数据分辨率降低了模型的预测性能，至少需要两周的数据才能令人满意地捕捉到该海滩岸线位置的变化趋势。集合预测的使用是基于模型试验的集体表现，通过捕获不同的时间行为，从而以最小的计算成本提供准概率预测，证明是有益的。总的来说，该研究强调了DL模型的潜力，特别是具有自回归架构的模型，用于可靠和可转移的海岸线变化预测。它还强调了数据质量、分辨率和预处理在提高模型鲁棒性方面的重要性，为未来在多尺度海岸线预测中使用深度学习的研究奠定了基础。

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引用次数: 0

Comparative assessment of bathymetric methods using unmanned aerial vehicle (UAV) high-resolution multispectral imaging 利用无人机（UAV）高分辨率多光谱成像的测深方法比较评估

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-15 DOI: 10.1016/j.coastaleng.2025.104854

S.P. Viaña-Borja , S. Heredia , G. Navarro , X. Santamarta-Benito , N. Araujo-Suarez , I. Caballero

Unmanned Aerial Vehicles (UAVs) equipped with multispectral sensors offer a promising, cost-effective alternative for high-resolution bathymetric mapping in dynamic coastal environments. This study evaluates the feasibility of adapting two established satellite-derived bathymetric (SDB) methods, the Stumpf (S) and Caballero-Stumpf (CS), to UAV-based multispectral imagery (UDB, UAV-Derived Bathymetry). Four UAVs flights are conducted over Luarca (Northern Spain), capturing data from a port and an adjacent beach with varying turbidity and environmental conditions. Results indicates that the UDB_green model, based on the green band reflectance, consistently outperforms in accuracy the UDB_red model, based on the red band, with median absolute errors (MedAE) ranging from 0.41 to 0.67 m for depths up to 7 m. Conversely, UDB_red exhibits poor performance in these waters. A composite methodology integrating multiple UAV flights is also tested through the first UAV-based implementation of the CS compositing method, originally developed for satellite imagery to address turbidity. However, it does not yield significant accuracy improvements over the traditional S model or single-image results, highlighting the influence of environmental factors and flight-specific parameters on UDB data quality. Given these findings, and considering that UAV platforms offer key operational advantages, such as higher spatial resolution, flexible acquisition timing, and better suitability for small or cloud-prone coastal areas, there is a strong need further validation of UAV-based techniques under varied coastal conditions.

配备多光谱传感器的无人机（uav）为动态沿海环境中的高分辨率测深测绘提供了一种有前途的、经济高效的替代方案。本研究评估了将两种已建立的卫星衍生测深（SDB）方法——Stumpf (S)和Caballero-Stumpf （CS）——应用于基于无人机的多光谱成像（UDB，无人机衍生测深）的可行性。四架无人机在Luarca（西班牙北部）上空进行飞行，从港口和邻近的海滩捕获不同浊度和环境条件的数据。结果表明，基于绿波段反射率的UDBgreen模型在精度上始终优于基于红波段的UDBred模型，在水深达7 m的情况下，中位绝对误差（MedAE）在0.41 ~ 0.67 m之间。相反，UDBred在这些水域表现不佳。通过首个基于无人机的CS合成方法的实现，还测试了集成多个无人机飞行的复合方法，CS合成方法最初是为卫星图像开发的，用于解决浑浊问题。然而，与传统的S模型或单图像结果相比，它并没有产生显著的精度提高，突出了环境因素和飞行特定参数对UDB数据质量的影响。考虑到这些发现，并考虑到无人机平台提供了关键的作战优势，如更高的空间分辨率、灵活的采集时间，以及对小型或多云沿海地区的更好适用性，迫切需要在不同的沿海条件下进一步验证基于无人机的技术。

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引用次数: 0

An initial analysis of swash flow velocity patterns 对斜流速度模式的初步分析

IF 4.5 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering

Pub Date : 2025-08-12 DOI: 10.1016/j.coastaleng.2025.104853

Weihan Li , Yi Pan , Weiqiu Chen , Giovanni Coco

This study presents a comprehensive analysis of an extensive dataset comprising 63 time series of swash flow velocity extracted from 15 previous studies, including both laboratory experiments and field observations. A consistent pattern in the swash flow time series is identified across the beachface profile, characterized by an approximately linear decrease around the flow reversal point, followed by a deviation point and subsequent deceleration. By defining two key transitional times as functions of the relative location along the beachface, a general form of swash flow is established. The swash flow behavior during the early uprush and late backwash phases, the influencing factors affecting the characteristics of swash flow velocity time series, and the cross-shore distribution of initial uprush velocity are further discussed. Based on this analysis, a general representation of the temporal-spatial evolution of swash flow velocity is proposed. These findings provide new insights into swash hydrodynamics and offer a foundation for future quantitative parameterization of cross-shore swash flow processes.

本研究对一个广泛的数据集进行了全面分析，该数据集包括从先前的15项研究中提取的63个时间序列的冲刷流速度，包括实验室实验和现场观测。在整个滩面剖面上发现了一个一致的斜流时间序列模式，其特征是在流动反转点附近近似线性减少，然后是一个偏差点，随后是减速。通过定义两个关键的过渡时间作为沿海滩面相对位置的函数，建立了一个一般形式的冲刷流。进一步讨论了冲升早期和反冲后期的冲刷流特性、影响冲刷流速度序列特征的因素以及初始冲升速度的跨岸分布。在此基础上，提出了冲刷流速度时空演化的一般表示。这些发现提供了对冲刷流体动力学的新见解，并为未来跨海岸冲刷流动过程的定量参数化奠定了基础。

引用次数: 0