Wave Runup and Overtopping at Seawalls Built on Land and in Very Shallow Water

Abstract

The current study proposes prediction formulas both for random wave runup and mean overtopping discharge at seawalls constructed on land or in very shallow water. Although several existing formulas for runup and overtopping use the incident wave characteristics at the toes of seawalls, this study adopts the equivalent deepwater wave characteristics and an imaginary seawall slope for easy application of the formulas, especially in relation to seawalls constructed on land. The prediction formulas for overtopping use the predicted runup values. For the wave runup prediction formulas two sets of experimental data are used; i.e., a new set of data and the data obtained in a previous study. For the wave overtopping prediction formulas, the experimental data measured in a previous study are used. Comparisons with measurements show good performances of both new prediction methods.

Coastal Flood Assessment Based on Field Debris Measurements and Wave Runup Empirical Model

“…The eastern section contains some low lying coastal defenses, which are situated landward of the beach or on the upper beach, with a structure toe above HAT. We therefore assume an alongshore and natural wave energy dissipation across the beach in this area, where runup can occur on the sloping beach, as underlined by the Mase et al [41] study on wave runup and overtopping. At the western zone of the study site, almost the entire beach has been eroded as a result of wave reflection and scouring at the wall toe [51,52] (Figure 2b).…”

“…[29,38,[55][56][57]] or in areas of armoured coastline (e.g. [41,42]). In reality, coastal zones prone to flood risk will contain a combination of both natural and artificial sections, which highlights the need for a local to regional approach when considering coastal flooding vulnerability.…”

“…Types of structures range from low sloping coastal defenses to vertical seawalls. The main factors that influence flooding over sloping structures are wave runup and overtopping [41,42]. However, for vertical seawalls where ∞, wave runup is minimal and is limited to a theoretical value of % ⁄ 1.4 [43].…”

Analysis of Climate Change Effects on Seawall Reliability

“…However, when a structure is built in very shallow water or on land, the wave height at its toe is not easy to define. Mase et al [2013b] proposed the prediction model linking wave runup and overtopping on seawalls built on land and in very shallow water. This model is used in the present study for evaluating the failure probability of seawalls.…”

Two-Dimensional Wave Overtopping Calculation Over a Dike in Shallow Foreshore by Swash

“…EurOtop, 2007;Mase et al, 2013) using wave boundary conditions. Wave boundary conditions are typically estimated using physical models and numerical models.…”