STUDY ON RECENT DYNAMIC EVOLVEMENT OF TIAOZINI SANDBANKS ALONG COASTAL ZONE IN JIANGSU PROVINCE, CHINA

摘要

The Radiating Sandbanks of Jiangsu coast are famous for the special cause of formation, complex geology and geomorphology conditions and peculiar hydrodynamic status. The Tiaozini Sandbanks located in the center of Radiating Sandbanks is chosen as the study area in this paper. We use Remote Sensing images of the study area from 1973 to 2000 to analyze its dynamic evolvement. The study results are: (1) Bare area of Tiaozini Sandbanks in low tide becomes larger in recent years. Through developing sandbar and joining up little sandbanks with the main sandbank, the Tiaozini Sandbanks expand to three directions to north, east and south. (2) Different tidal flat takes on different stability: Erfenshui tidal ridge is the most stable and the central tidal flat besides Xidagang Tidal Creek is changeful. (3) Sandbank tidal creek systems have complex shift characters. First, the main tidal creek systems have different shift range and velocity. Second, the different parts of a single tidal creek system also have different shift range and velocity. Third, the near shore tidal creek systems have periodicity and the tidal creek systems located in the east area of Xidagang Creek are stable relatively. Last, tidal creek shift has two forms: sudden and gradual changes, excited by sudden events and normal change of hydrodynamics respectively.