Prediction of Beach Erosion Caused by Reduction of Fluvial Sand Supply Due to Excess Sand Mining and Beach Recovery After Prohibition of Mining

San-Nami, Toshiro; Uda, Takaaki; Ohashi, Norikazu; Iwamoto, Hitoshi; Serizawa, Masumi; Ishikawa, Toshinori; Miyahara, Shiho

doi:10.9753/icce.v33.sediment.61

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…6(a), because the beach slope became steeper to lose the stability of fine materials. In fact, the erosion and loss of fine sand on the basis of this mechanism was observed downcoast of L-shaped groin on the Shimizu coast (San-nami et al, 2012).…”

Section: Comparison Between Effects Of Groin and Detached Breakwatermentioning

confidence: 93%

Offshore Sand Discharge Caused by Constructing Coastal Structures on a Steep Coast With a Large Shoreline Curvature

Miyahara¹,

Uda

Serizawa³

et al. 2012

Int. Conf. Coastal. Eng.

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A groin or a detached breakwater was installed at a cuspate foreland formed on a coast with an abrupt change in coastline orientation and the effect of obstructing longshore sand transport was investigated. The results of the experiment were reproduced using the BG model (a 3-D model for predicting beach changes based on Bagnold’s concept). The beach changes around the structures installed at the cuspate foreland were successfully predicted and the experimental and numerical results were in good agreement. The differences between the effects of the groin and detached breakwater in controlling longshore sand transport and the offshore sand discharge caused by constructing such coastal structures on a steep coast were successfully explained.

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Section: Comparison Between Effects Of Groin and Detached Breakwatermentioning

confidence: 93%

Offshore Sand Discharge Caused by Constructing Coastal Structures on a Steep Coast With a Large Shoreline Curvature

Miyahara¹,

Uda

Serizawa³

et al. 2012

Int. Conf. Coastal. Eng.

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“…The arc-shaped shoreline of Kujukuri Beach was reproduced given these conditions. Furthermore, San-nami et al [20] have investigated the long-term topographic changes since 1968 along the entire Shizuoka and Shimizu coasts including a 17 km stretch extending between the Abe River and the Mihonomatsubara sand spit. The beach erosion of these coasts was triggered by the decrease in sediment supply from the Abe River due to excessive riverbed mining until 1967.…”

Section: Introductionmentioning

confidence: 99%

A Long-Term Prediction of Beach Changes around River Delta using Contour-Line-Change Model

Uda¹,

Miyahara²,

San-Nami³

et al. 2019

Sedimentation Engineering [Working Title]

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The long-term beach changes along the Kaike coast (Japan) have been investigated. Being a major source of sand to this coast, the Hino River has supplied a large amount of sand during the extensive mining of iron sand in the past, resulting in the shoreline advance. However, the stoppage of the sand mining has caused a marked decrease in the sand supply, resulting in a rapid shoreline recession around the river delta. The beach changes triggered by these human activities have been investigated using an old geographical map and aerial photographs taken between 1947 and 2005. Then, the beach changes have been reproduced using the contour-line-change model considering the change in grain size of the beach sediments. Bathymetric data have been analyzed in order to evaluate the longshore sand transport and the fluvial sand supply from the Hino River. The measured and predicted three-dimensional beach changes were in good agreement and the effectiveness of the contour-line-change model for predicting long-term beach changes was confirmed by this case history.

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Recent Shoreline Changes Due to High-Angle Wave Instability along the East Coast of Lingayen Gulf in the Philippines

Uda

Noshi

2021

Geosciences

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A small perturbation on the shoreline may develop under high-angle wave conditions, resulting in the formation of sand spits along the shoreline. Serizawa et al. explained the development of sand spits caused by the instability mechanism using the BG model (a model for predicting 3-D beach changes based on Bagnold’s concept). However, examples of the development of sand spits caused by this mechanism in the field are limited in number. Lingayen Gulf in the Philippines has a large aspect ratio, so shoreline instability occurs along the coastline, significantly affecting the shore protection along the coast. In this study, the shoreline instability along the river delta coasts around the Balili and Aringay Rivers flowing into Lingayen Gulf and a sand spit were investigated using satellite images together with field observation. The shoreline changes observed south of the Aringay River mouth were compared with those observed in a previous study on the development of a sand spit by San-nami et al. The rate of longshore sand transport to form a sand spit at Santo Tomas in Lingayen Gulf was estimated to be approximately 1.3 × 105 m3/yr, which is in good agreement with the value measured on the Shimizu coast in Suruga Bay, with a comparable aspect ratio of 1.2 relative to 1.3 in Lingayen Gulf. It was concluded that shoreline undulations have evolved downcoast of two river deltas owing to high-angle wave instability along the east coast of Lingayen Gulf and the formation of a sand spit has occurred. A soft measure, such as sand bypassing, would be better to be adopted along the coasts in Lingayen Gulf instead of hard measures against erosion, to prevent rapid expansion of an artificial, protected coastline.

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Prediction of Beach Erosion Caused by Reduction of Fluvial Sand Supply Due to Excess Sand Mining and Beach Recovery After Prohibition of Mining

Cited by 3 publications

References 7 publications

Offshore Sand Discharge Caused by Constructing Coastal Structures on a Steep Coast With a Large Shoreline Curvature

Offshore Sand Discharge Caused by Constructing Coastal Structures on a Steep Coast With a Large Shoreline Curvature

A Long-Term Prediction of Beach Changes around River Delta using Contour-Line-Change Model

Recent Shoreline Changes Due to High-Angle Wave Instability along the East Coast of Lingayen Gulf in the Philippines

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