Remote sensing monitoring of the Caofeidian tidal zone evolution

By choosing seven scenes' remote sensing data of American Landsat and CBERS, HJ-1 from 1981 to 2011 and tide and sea level data, and applying the method of "same sea level contrasting", the paper analyzed and studied the spatial distribution of tidal zone and the dynamic evolution trend of tidal flat in Caofeidian. The results indicated that in the past thirty years, shape of tidal zone had changed greatly because it was affected by human activities such as the tidal flat reclamation and sea reclamation. The upper bound of tidal zone advanced seaward gradually with about 3 km of maximum distance, which made the upper part of tidal flat area reduced constantly. Meanwhile, affected by the sediment runoff decrease, storm washing, subsidence and sea level rise, the lower part of tidal flat was eroded overall, and the west part was gentle, and the east part was more severe. In addition, the balance of tidal flat was broken during the large-scale exploitation and construction in this area, and the tidal flat deposited temporarily in some coasts.