Wave Run-Up on Mortar-Grouted Riprap Revetments

Abstract

The wave run-up height is a crucial design parameter that determines the crest height of a sea dike and is used for estimating the number of overtopping waves. Therefore, a reduction of the wave run-up height is generally aspired in the design of dikes, which can be achieved by mortar-grouted riprap revetments (MGRR). Although MGRRs are widely utilized revetments along the German North Sea coast, no investigations into the wave run-up height on this revetment type are available to date. Full-scale hydraulic model tests were hence conducted to investigate wave run-up heights on partially grouted and fully grouted MGRRs. The wave run-up was determined using 2D-LIDAR measurements, which were validated by video data. Partially grouted MGRRs, due to their roughness, porosity, and permeability, reduce wave run-up heights from 21% to 28%, and fully grouted MGRRs due to their roughness reduce wave run-up heights from 12% to 14% compared to smooth impermeable revetments. Influence factors have been determined for four widely used revetment configurations, which can now be used for design purposes. A comparison and subsequent discussion about the representation of the physics of wave run-up by different parameters is carried out with the results presented.

A Study on the Application of Low Crest Structures to Reduce Wave Overtopping

“…이러한 파랑이 해안에 도달할 경우 대규모 표사이동의 발생과 모래유실에 의한 해빈폭의 감 소는 당초의 해안선을 육지방향으로 이동시키기 때문에 짧아 진 해빈폭은 고파랑에 대한 충분한 완충지역으로의 역할을 수 행하지 못하게 된다 (Shim et al, 2019;Shim and Kim, 2020). 뿐만 아니라 해역의 활용도를 높이기 위해 친수성 호 안을 설치하는 사례가 증가하고 있으며, 호안의 경우 해안을 매립하는 경우도 있기 때문에 해빈폭의 감소와 함께 파랑의 불충분한 감쇄현상 (Kreyenschulte et al, 2020)은 호안 시설 물에 직접적으로 영향을 주어 제체 등의 안정성을 저하시킬 뿐만 아니라 호안 배후로의 월파량을 증가시킨다 (Baldock et al, 2011). 이러한 현상은 태풍내습시 피해사례를 통해서도 확 인할 수 있으며 이로인한 인명 및 재산 피해를 방지하기 위 해서는 파랑 및 월파저감을 위한 면밀한 검토가 필요하다.…”

Simulation of the Riprap Movement Using the Continuous-Time Random Walking Method

“…The transport of riprap is similar to the bedload in the broad sense. In the condition of an underlying water surface, these methods used for riverbanks are no longer applicable [2]. The stability evaluation of riprap adopts Monte Carlo simulation, inertia analysis, the Faroson blue point estimation method and others to calculate the riprap under the flow conditions [3,4].…”