SPATIO-TEMPORAL CHARACTERISTICS OF ORGANIC RICH SEDIMENT ACCUMULATION BASED ON CORE SAMPLES AT THE HEAD OF TOKYO BAY
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- O HaeChong
- 東京大学 大学院新領域創成科学研究科
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- SASAKI Jun
- 東京大学 大学院新領域創成科学研究科
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- SANO Hiroaki
- 横浜市役所
Bibliographic Information
- Other Title
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- 東京湾奥部における柱状採泥に基づく有機汚濁底質の時空間堆積特性
- トウキョウワン オウブ ニ オケル チュウジョウサイデイ ニ モトズク ユウキ オダクテイシツ ノ ジクウカン タイセキ トクセイ
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Abstract
The authors performed field surveys, collecting surface and core sediment samples at 39 stations at the head of Tokyo Bay in 2014 and 2015, to analyze spatial and temporal variation in sediment quality during the past three decades. Sediment quality, such as grain size distribution and TC, was measured along with radiations of Pb-210 and Cs-137 for determining age of sediment. Collected sediments were classified into four groups through a cluster analysis and characteristics of sediment variation were identified, such as the appearance of maximum TC at the surrounding area of the center at the bay head and significant influences of the distance from major rivers and coasts, sediment accumulation rates, and a frequency of exposure to hypoxic water. TC values took peak around 1980s, then decreasing and recently they have a tendency of restoring to high values, which tendency is consistent with the recent unsuccessful restoration of water environment in terms of hypoxia.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72 (2), I_1291-I_1296, 2016
Japan Society of Civil Engineers