Prediction of Bathymetric and Grain Size Changes Around Port Subject to Active Supply of Sand From Large River

Nagayama, Hideki; Uda, Takaaki; Matsu-Ura, Takeo; Kumada, Takayuki

doi:10.1142/9789814277426_0174

Cited by 1 publication

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“…Furthermore, southward longshore sand transport prevails under the predominant wave direction from the east on the coast north of Oharai Port, and the Naka River flows into the Pacific Ocean 3 km north of the port, implying that the source of the sand deposited in region II is fluvial sand supplied from the river; thus, the sediment supply from the Naka River is 6.0×10 4 m 3 /yr. Nagayama et al (2008) estimated that the sediment supply from the Tone River, which flows into the Pacific Ocean at the south end of the Kashimanada coast, is approximately 1.0×10 5 m 3 /yr on the basis of bathymetric survey data. The ratio of sediment supply from the Naka River to that from the Tone River is 0.6.…”

Section: Changes In Accumulated Sand Volumementioning

confidence: 99%

Sand Accumulation in Wave-Shelter Zone of Oharai Port and Change in Grain Size of Seabed Materials on Nearby Coast

Matsu-Ura¹,

Uda²,

Kumada³

et al. 2011

Int. Conf. Coastal. Eng.

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Beach changes around Oharai Port facing the Pacific Ocean were investigated using bathymetric survey data collected over 25 years between 1979 and 2004. Between the south and offshore breakwaters of Oharai Port, 1.50×106 m3 of fine sand was deposited in this period, i.e., at an annual rate of 6.0×104 m3/yr, which was originally supplied from the Naka River 3 km north of the port. Also in the wave-shelter zone of the offshore breakwater south of the port, 7.0×106 m3 of fine sand was deposited between 1979 and 2004 at an annual rate of 2.8×105 m3/yr, which was transported by the northward longshore sand transport induced from outside to inside the wave-shelter zone of the offshore breakwater, resulting in severe beach erosion on the south coast outside the wave-shelter zone. Taking into consideration the fact that sand transport to the Kashimanada coast is now completely obstructed by the port breakwaters, sand bypassing and sand back passing to the coast from the sand deposition zone of Oharai Port are required.

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Section: Changes In Accumulated Sand Volumementioning

confidence: 99%