Erosion of Oharai-Isohama Coast and Caving of Seawall of Oharai Aquarium

Uda, Takaaki; Matsu-Ura, Takeo; Osaki, Yasuhiro; Ooki, Yasuhiro; San-Nami, Toshiro

doi:10.2208/kaigan.72.i_643

Cited by 2 publications

(2 citation statements)

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“…The vertical length from this line to the elevation of the backfilling surface in each mesh is defined as d max,i for the initial time and d i for the other, where i is the mesh number in the horizontal direction. This line is also used as the datum line to calculate the static water pressure in Equation (12).…”

Section: The Simulation Proceduresmentioning

confidence: 99%

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The Reproduction Ability of a Numerical Model for Simulating the Outflow Rate of Backfilling Materials from a Coastal Structure

Silarom

Yamamoto

2019

JMSE

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In very shallow areas, the frequency by which coastal structures (like dikes and seawalls) are directly broken by large wave forces is low because large waves are broken in deeper areas. The main cause for such destruction is ground scour in front of the structures and outflow of backfilling materials by middle-scale waves; therefore, the scour and the outflow should be considered when designing a coastal structure in a very shallow area. In this paper, a numerical model consisting of CADMAS-SURF, which can calculate fluid motion in porous media, and empirical equations for simulating the outflow phenomena are introduced; thereafter, practical calculations on field cases in Thailand and Japan are demonstrated. Additionally, since the effects of wave periods and water depth to the outflow rate have never been clarified, hydraulic model experiments, empirical calculations using an existing formula, and numerical simulations are performed in order to examine these effects on the outflow rate. The simulated results using the numerical model align well with the experimental results. Moreover, both results show that the outflow rate is proportional to the wave period and inversely proportional to water depth.

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Section: The Simulation Proceduresmentioning

confidence: 99%

“…In order to calculate the outflow rate, the dimension of the seawall and the wave characteristic of Typhoon No. 23 in 2015 were extracted from the report of Uda et al [12], as shown in Table 1. The maximum outflow volume per unit width was estimated from the field survey's photographs.…”

Section: Oarai-isohama Coastmentioning

confidence: 99%