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Sediment Dynamics and Morphodynamics of River-Sea Sediment Dispersal Systems through Space and Time: A Source-to-Sink Perspective
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Sedimentological study of sediment cores offshore Jiulongjiang River: Preliminary results from 210Pbex
P-G1-07-S
Jimmy J. Xu* , Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
James T, Liu, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Steven C. Chien, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Chih-Chien Su, Institute of Oceanography, National Taiwan University, Taipei, Taiwan
Presenter Email: qaz4778706@gmail.com |
| The Jiulongjiang River (JLJ) is located in Fujian, China and flows eastward into the Taiwan Strait. It is one of the major rivers in Fujian and the sediment supply is not negligible. The source-to-sink process of sediment dispersal process from JLJ is affected by many factors such as the river hydrology, China's coastal currents, and typhoons, etc. In this research, the 210Pbex activity in the cores collected offshore the mouth of JLJ was used to examine deposition pattern and to calculate the deposition rate to investigate the sedimentation process.
In 2015, on R/V Ocean Research III (OR3) cruise 1850, our team collected 4 cores, KM4, KM6, KM7 and MK1. KM4-KM7 were located along a seaward transect between the JLJ mouth and the Taiwan Strait. MK1 was located near the south shore of Qinmen. The 210Pbex activity indicates signals of fresh terrigenous sediments and can be used to calculate the deposition rate of surface sediments. Based on the 210Pbex activity profile of each core, the 210Pbex activity decreases from KM4 to KM7. The deposition rates of KM4 and KM7 are similar. KM6 was disturbed and has a slower deposition rate. These findings indicate that as the JLJ sediments were transported into the Taiwan Strait, there was sediment supplied from other sources. Also physical processes disturb the surface sediments, resulting in a decreasing 210Pbex activity.
In the future, the Empirical Orthogonal Function (EOF) will be used to analyze the correlations among core composition, color reflection, physical properties from MSCL and radioisotope analysis (7Be activity) to investigate the sedimentation process and sediment composition of the JJL source-to-sink dispersal system.
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