JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS13] [EE] 陸域海洋相互作用

2017年5月23日(火) 10:45 〜 12:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:山敷 庸亮(京都大学大学院総合生存学館)、升本 順夫(東京大学大学院理学系研究科)、Behera Swadhin(Climate Variation Predictability and Applicability Research Group, Application Laboratory, JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001)、宮澤 泰正(独立行政法人海洋研究開発機構)

[AOS13-P05] Water and sediment discharge from four small mountainous rivers in Zhejiang province: The roles of basin area, rainfall and human activities

*shasha Lu1 (1.Second institute of oceanography, SOA)

キーワード:water discharge, sediment discharge, mountainous river

As a separate area whose water system flowing into sea, Zhejiang Province discharging water and sediment into sea is mainly through mountainous rivers and has different characteristics from other parts of China. Variations of water and sediment discharge from 4 small mountainous rivers were examined and compared from 1957 to 2008 at the monthly and yearly scales. The results showed that the 4 mountainous rivers presented a similar variability. High/low sediment discharge was always coupled with high/low water discharge in both scales of monthly and yearly. And high water and sediment discharge occurred in the flood season. Rainy season and typhoon season were the main period of flood in Zhejiang Province, with a mean water discharge of 75.4% and sediment discharge of 92.2% into sea. The more sediment discharge than water is caused by the high-increasing sediment yield during the huge flood. The total water and sediment discharges of the 4 individual rivers depend on the areas of the 4 river basins, while the variation trends of the water/sediment discharge are controlled by the rainfall. The human activity, principally the construction of reservoirs, significant increased the water discharge in the dry season and decreased it in the flood season, and decreased the total sediment discharge in addition.