Comparison of accelerated erosion in riverbed and downstream coast by EOF analysis

Yuhi, Masatoshi; Dang, Minh Hai; Umeda, Shinya

doi:10.2112/si65-105.1

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…On average, the beach width has decreased approximately 20 m in the last two decades. The overall eroding trend is considered to be related to the construction of Kanazawa Port and the development of the Tedori River basin [2][3][4]. It is quite important to examine the possible causes of accelerated erosion, but such an examination is beyond the scope of the present study.…”

Section: Characteristics Of Shoreline Changementioning

confidence: 98%

“…The principal source of sediment here is the Tedori River, the mouth of which is located approximately 45 km southwest of the study area. In recent decades, however, the sediment discharge from the Tedori River has decreased because of various anthropogenic anthropogenic modifications of the river basin, such as extensive sand mining and dam construction commencing in the 1960s [2,3]. In addition, this area was largely separated from the updrift (southwest) portion of the littoral cell following the construction and extension of the main breakwater at Kanazawa Port (which stretches out to water depths of approximately 13 m with a total length of 3.2 km) after 1970 [4].…”

Section: Introductionmentioning

confidence: 99%

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Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan

Yuhi

Matsuyama

Hayakawa

2016

JMSE

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Sandy beaches play a key role in regional tourism. It is important to understand the principal morphological processes behind preserving attractive beaches. In this study, morphological variation on the Chirihama Coast, Japan, an important local tourism resource, was investigated using two sets of field surveys. The objective was to analyze and document the multi-scale behaviors of the beach. First, long-term shoreline changes were examined based on shoreline surveys over the last two decades. Then, the middle-term behavior of multiple bar systems was analyzed based on the cross-shore profile surveys from 1998 to 2010. An empirical orthogonal function (EOF) analysis was conducted to capture the principal modes of the systematic bar migration. The shoreline analysis indicated a long-term eroding trend and showed that the seasonal variation has recently tended to increase. The profile analysis demonstrated that net offshore migrations of bars have been repeated with a return period of approximately four years. This general behavior of the bar system is similar to the net offshore migration phenomena observed at other sites in the world. EOF analysis revealed a relationship between bar configuration and middle-term variations in shoreline location; when a new bar is generated near the shoreline and a triple bar configuration is established, the shoreline tends to temporarily retreat, whereas the shoreline experiences an advance when the outer bar has most evolved.

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Section: Characteristics Of Shoreline Changementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan

Yuhi

Matsuyama

Hayakawa

2016

JMSE

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Assessing the impact factors and corresponding weights affecting the coastal morphology of Hsinchu Coast, Taiwan

Huang

Hsu

Yuan

2023

Journal of Sea Research

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Sediment Budget and Net Sediment Transport on a Coast Dominated by Waves and Offshore Currents: A Case Study on the Ishikawa Coast and Its Surrounding Areas in Japan

Thunyaphun

Umeda

Yuhi

2023

JMSE

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This study discusses the coastal sediment budget for the Ishikawa coast using 12 years of observational datasets; it involves an understanding the local and regional sediment dynamics, the intensity of the transport processes in the region, and sediment supply from a local river. Although alongshore sediment transport and sediment budgets have been analyzed in previous studies, only a few conducted cross-shore sediment transport evaluations. The concentration of suspended sediments will be determined in this study, taking into account the influence of waves that are associated with the coastal current. The cross-shore sediment transport using sediment budget analysis indicated that the net alongshore sediment transport directions in the surf and offshore zones are opposite on the Ishikawa coast. The increase in the sediment budget of the surf zone can be attributed to the river sediment supply and longshore sediment transport inflow. Because of the significant outflow components of longshore and cross-shore sediment transports, the offshore zone budget showed a decreasing trend. A detailed sensitivity study was performed by varying the input parameters, in order to determine the possible ranges of net transport rates and sediment transport to the adjacent coasts. The results demonstrated the possibility of a clockwise residual sediment circulation. Our method can be used to analyze the alongshore sediment transport for other coasts and supplement future studies on coastal sedimentology and sediment budgets.

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Comparison of accelerated erosion in riverbed and downstream coast by EOF analysis

Cited by 3 publications

References 10 publications

Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan

Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan

Assessing the impact factors and corresponding weights affecting the coastal morphology of Hsinchu Coast, Taiwan

Sediment Budget and Net Sediment Transport on a Coast Dominated by Waves and Offshore Currents: A Case Study on the Ishikawa Coast and Its Surrounding Areas in Japan

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