| Technology Application |
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Effects of vegetation on the dynamic of tidal creeks based on quantitative satellite remote sensing：A case study of Dongtan in Chongming |
| ZHENG Zongsheng1,2, ZHOU Yunxuan2, TIAN Bo2, WANG Jian1, LIU Zhiguo3 |
1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;
2. Institute for Digital Ocean Research of Marine Science Institute, Shanghai Ocean University, Shanghai 201306, China;
3. East Sea Information Center, State Oceanic Administration, Shanghai 200137, China |
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Abstract Tidal channels, vegetation types and FVC (fractional vegetation cover) were extracted from high resolution aerial images according to the field measurement. Combined with multi-temporal satellite images and numerical ocean model, the authors employed the waterline and the width-to-depth ratio methods to inverse the tide creek bottom elevation, with which the Dongtan 3D terrain of Chongming was constructed. The effects of vegetation on tidal creeks were analyzed and some conclusions were reached: 1 The root mean square error between the tidal channel calculation and the measured result is 0.545 m at Dongtan of Chongming, and the accuracy is higher at high tide beach than at the low tidal beach; 2 From low to high tide flat, tidal channel depth increases first and then decreases along the longitudinal profile. The shallow tidal creek at the high tidal flat results from the weakness of water dynamics and beach consolidation by the vegetation roots, where downward erosion is inhibited. On the other hand, tidal channel becomes wide and shallow at the low tidal flat owing to lateral erosion without vegetation cover and weak hydrodynamics; 3 Tidal channel depth is deep in the south and shallow in the south. The Dongtan tidal channel density and vegetation coverage show significant negative correlation (r=0.560 4, p<0.02), and tidal channel length has a significant corresponding relation with vegetation types. Tidal channel length is longer in Spartina alterniflora and reed communities than in Scirpus mariqueter areas. Tidal creeks are undeveloped in the tidal flat with high density vegetation coverage.
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| Keywords
land reclamation
remote sensing monitoring
hyperspectral remote sensing
ecological restoration
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Issue Date: 01 July 2014
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2014,
Vol. 26
