Morphological evolution and human activities impacts at the mouth area of the North Branch, Yangtze estuary, during the recent three decades

doi:10.3969/j.issn.1000-5641.2015.04.005

Abstract

Abstract: In order to enrich the knowledge of landocean interaction, this paper examined the recent accretion and erosion at the mouth area of the North Branch, the Yangtze Estuary, based on bathymetric and remote sensing data and using ArcGIS techniques. The results show that: (1) from 1981 to 1997, 13 km2 of intertidal area was reclaimed; an average accretion rate of 1.4 cm/yr was observed in the subtidal area. (2) from 1997 to 2012, 163 km2 of intertidal zone was embanked, and an average erosion rate of -7.1 cm/a was found in the subtidal area. (3) Between 1981 and 2012, an average accretion rate of 0.77 cm/a was found in the inner portion, and an average erosion rate of -1.97 cm/a occurred in the outer portion. We concluded that the morphological evolution in the study area was controlled by three factors—the silting trend of the North Branch, the intertidal accretionpromoting projects, and dam construction within the Yangtze watersheds. During the recent 15 years, human activities were the dominant factor.

Key words: estuary, geomorphology, erosion and accretion, north branch of the yangtze river, human impacts

CLC Number:

K903

WANG Ru-sheng,YANG Shi-lun,LUO Xiang-xin,LU Ye-feng,MIAO Li-min.
Morphological evolution and human activities impacts at the mouth area of the North Branch, Yangtze estuary, during the recent three decades[J]. Journal of East China Normal University(Natural Sc, 2015, 2015(4): 34-41.

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