Acta Geographica Sinica ›› 2013, Vol. 68 ›› Issue (7): 955-965.

Previous Articles     Next Articles

A morphological analysis of tidal creek network patterns on the central Jiangsu coast

WU Deli, SHEN Yongming, FANG Renjian   

  1. College of Geographic Science, Nanjing Normal University, Nanjing 210023, China
  • Received:2013-03-25 Revised:2013-04-16 Online:2013-07-27 Published:2013-07-27
  • Supported by:
    National Basic Research Program of China (973 Program), No.2013CB956503; National Natural Science Foundation of China, No.40973053

Abstract: This paper details the two-dimensional geomorphology of the tidal creek systems and their migration characteristics using MSS, TM/ETM + data of 1981-2010 and field investigation. The results show that the tidal creeks in this area could be divided into four grades according to their lengths: 7587±1544 m, 1921±916 m and 327±200 m with numbers of 21, 97 and 688 (1:5:33), respectively. The tidal creeks within the study area were well developed in the middle tidal belt, and their drainage density and bifurcation ratio were much greater than those in the high and low tidal belts. The curvature of main tidal creek decreased from high tidal belt to the low one. The development of tidal creeks are influenced by the exotic introduction of Spartina alterniflora, and obviously restrained by the reclamation activities. The lateral migration or sway of the tidal creeks exhibited significant difference in rank and region. Compared with the tidal creek systems in the northern part of the area studied, those in the southern part with a larger tidal range have a larger lateral movement ranges and migration rates; as for a tidal creek system, the sway intensity of a first-order creek is greater than that of a second-order creek, followed by a third-order creek; for a single tidal creek, the case is the lower segment > the middle segment > the upper segment; and within an individual segment, the migration intensity of the curving segment is greater than that of the straight segment. The lateral migration is not obvious in the upper segment of the first-order creeks, the middle and upper segment of the second-order creeks, the third-order creeks and the creeks in the S. alterniflora salt-marsh.

Key words: two-dimensional geomorphology, tidal creeks, migration characteristics, Jiangsu coast