The effect of groins characteristic on sandy beach stability

IF 2.2 Q1 MARINE & FRESHWATER BIOLOGY

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI:10.1016/j.ejar.2023.04.005

E.M. Heikal, A.S. Koraim, Aya.A. Rafea, I.A. Elbagory

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引用次数: 0

Abstract

Groins are one of the most important facilities used to protect coastal regions. In this research, groins made from a concrete cube were tested experimentally. This research investigates the impact of groin length (Lg) of 105, 135, and 165 cm and groin angle with the normal axis of the shoreline (θ) of 0^°, 10^°, 20^°, and 30° under different dimensionless wave numbers (khg), from 0.34 to 1.26, with the beach slope of 8:1. The units used to indicate erosion and deposition are dimensionless erosion depth (Smax/h), dimensionless deposition height (Dmax/h), and dimensionless erosion hole length (lsmax/h). The sandy bed changes and wave reflection from the groin were monitored. The results showed that the angle of 30° had more impact on beach stability than that of 0°, and more sediments were eroded by short groins than by long ones. The reflection of waves from groins was also studied as a function of the reflection coefficient (kr). As concluded, short groins reflect higher waves than long ones.

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丁坝特性对沙滩稳定性的影响

Groins是用于保护沿海地区的最重要的设施之一。在这项研究中，对由混凝土立方体制成的丁坝进行了实验测试。本研究调查了在不同无量纲波数（khg）（0.34至1.26）下，105135和165cm的丁坝长度（Lg）和0°、10°、20°和30°的丁坝与海岸线法向轴的夹角（θ），以及8:1的海滩坡度的影响。用于表示侵蚀和沉积的单位为无量纲侵蚀深度（Smax/h）、无量纲沉积高度（Dmax/h）和无量纲侵蚀孔长度（lsmax/h）。监测了沙质海床的变化和腹股沟的波浪反射。结果表明，30°角对海滩稳定性的影响大于0°角，短丁坝对沉积物的侵蚀量大于长丁坝。还研究了波浪从丁坝的反射作为反射系数（kr）的函数。总之，短丁坝比长丁坝反射的波浪更高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Egyptian Journal of Aquatic Research MARINE & FRESHWATER BIOLOGY-

CiteScore

6.80

自引率

5.70%

发文量

审稿时长

39 days

期刊介绍： The Egyptian Journal of Aquatic Research is published by the National Institute of Oceanography & Fisheries. The Journal isdevoted to the publication of original papers and reviews in all branches of aquatic sciences (Oceanography, Limnology, Fisheries,Aquaculture and environmental sciences)