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GEOGRAPHICAL RESEARCH >

2011 , Vol. 30 >Issue 7: 1169 - 1177

DOI: https://doi.org/10.11821/yj2011070002

Earth Surface Processes

The environmental stability and the hazardous geology in seabed erosion and deposition of Jiaozhou bay

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  • 1. Key Laboratory of Ministry of Education for Coast and Island Development, Nanjing University, Nanjing 210093, China;
    2. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;
    3. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, Fujian, China

Received date: 2010-08-03

  Revised date: 2010-10-12

  Online published: 2011-07-20

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Abstract

Based upon the comparisons between underwater bathymetries digitized from nautical charts (1936-2002) and between coastlines derived from two landsat-5 TM images (1986-2007), the hazardous geology associated with erosion and deposition was analyzed for the past 70 years. During the last century, the sedimentary pattern was divided into nine types according to the depositional rates. The results show that the slight sedimentation happened as a whole in Jiaozhou bay from 1936 to 1963, while the slight erosion appeared in the eastern embayment (including Cangkou channel). Unlike before, the deposition obviously decreased from 1963 to 1982 and then the sedimentary environment transferred into the equilibrium. Besides, the strong sedimentation was dominant in Cangkou channel during this period. However, the Daguhe and Daoerhe channels were slightly eroded. Subsequently, most of coasts extended obviously towards the sea between 1986 and 2007; the average coastline extending rate was 101~102 m yr-1 and the slight erosion was observed on the seabed. Moreover, the analysis of tidal prism and cross-sectional area of tidal inlets shows that the current velocity amplitude and the corresponding equ-coefficient of friction had decreased over the past 70 years in Jiaozhou bay. This indicates that the entrance of Jiaozhou bay tended to be relatively instable.

Key words： hazardous geology; intensity of erosion and siltation; current velocity amplitude; equ-coefficient of friction; Jiaozhou bay

Cite this article

LIU Yun-ling, WANG Ya-ping, GAO Jian-hua, JIA Jian-jun, XIA Xiao-ming, LI Yan . The environmental stability and the hazardous geology in seabed erosion and deposition of Jiaozhou bay[J]. GEOGRAPHICAL RESEARCH, 2011 , 30(7) : 1169 -1177 . DOI: 10.11821/yj2011070002

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