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D-1.1.3 Study on methodology of the estimate of paleo-sediment discharge using marine sediments

[Contact Person]

Yoshiki Saito
Senior Research Scientist
Marine Sedimentology Section, Marine Geology Department
Geological Survey of Japan
Higashi 1-1-3, Tsukuba, Ibaraki 305-8567, Japan
Phone +81-298-54-3772, Fax. +81-298-54-3533
E-mail yoshi@gsj.go.jp

Total Budget for FY1996-FY1998

38,862,000 Yen (FY1998; 12,912,000 Yen)

Abstract

The purpose of this study is to develop methods for estimating paleo-sediment discharge and anthropogenic impact of river-load change on coastal environments on time scales of 10 to 10³ years based on analyses of marine sediment cores. Detailed sediment core analyses using borehole samples taken from the Huanghe (Yellow River) and Changjiang (Yangtze) deltas showed the increase of sediment discharge for the last 1000-2000 years due to human activities in their drainage areas. Sediment cores taken from sea bottom offshore Changjiang also showed anthropogenic changes in coastal environment. Some cysts of redtides causative dinoflagellates such as Lingulodinium polyedrum, Scrippsiella trochoidea and Polykrikos kofoidii/schwartzii complex occurred in the upper part of the gravity core G1, which dates to after about 1970.

[Key Words]

human impact, sediment load, Bohai Sea, East China Sea, Huanghe Changjiang,