EFFECT OF MIXING ON TURBIDITY MAXIMUM MOVEMENT DURING SEMILUNAR TIDAL CYCLE IN THE CHIKUGO RIVER ESTUARY

• AZHIKODAN Gubash

  首都大学東京大学院

• 横山 勝英

  首都大学東京

• 守村 融

  首都大学東京大学院

抄録

Spatial distribution and temporal variation of salinity and suspended sediment concentration (SSC) in the Chikugo river estuary, Japan, were measured for two weeks and investigated the effect of salinity mixing on the movement of the estuarine turbidity maximum (ETM). Vertically homogeneous salinity distribution and high SSC occurred during spring tide, and conversely, vertical stratification and clear water occurred during neap tide. Mixing, salinity intrusion, magnitude and location of ETM zone changed according to the semilunar tidal cycle. The flow ratio was determined using river discharge and the tidal prism, and a uniformly linear relationship was found between flow ratio and SSC. The relationship between salinity and SSC showed that SSC attained a peak in the region where salinity was 10 psu in lower estuary and region of 0.5 psu in the upper estuary. These indicate that the dominant factor determining SSC occurrence is the spring neap transition process and flow ratio.

収録刊行物

• 土木学会論文集Ｂ１（水工学）

  土木学会論文集Ｂ１（水工学） 70 (4), I_37-I_42, 2014

  公益社団法人 土木学会

キーワード

• Estuarine turbidity maximum
• tidal mixing
• flow ratio
• transition process

詳細情報

• CRID: 1390282680329472768
• NII論文ID: 130005070268
• DOI: 10.2208/jscejhe.70.i_37
• ISSN: 2185467X
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可