Comments on “Epiclastic deposits and “horseshoe-shaped” caldeiras in Tahiti (Society Islands) and Ua Huka (Marquesas Archipelago), French Polynesia” by Clément et al. (2003)
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Archipelago
Radermacher, M., Wengrove, M.E., Van Thiel de Vries, J.S.M., Holman, R.A., 2014. Applicability of video-derived bathymetry estimates to nearshore current model predictions. In: Green, A.N. and Cooper, J.A.G. (eds.), Proceedings 13th International Coastal Symposium (Durban, South Africa), Journal of Coastal Research, Special Issue No. 70, pp. 290–295, ISSN 0749-0208.In the framework of swimmer safety, coastal managers desire accurate nearshore current predictions obtained from numerical models. To this end, detailed and up-to-date bathymetry is a necessity. Remote sensing techniques for bathymetry estimation are a promising solution. The focus of this paper is to assess the performance of wavenumber-based bathymetric inversion using Argus imagery (also known as the cBathy algorithm) as a feasible input bathymetry for numerical models to make reasonable nearshore current predictions. Numerical flow simulations on a cBathy bed are compared to simulations on an in-situ surveyed bathymetry. Results demonstrate that simulated nearshore currents on a cBathy bathymetry have a root-mean-square error in the order of 10 cm/s (magnitude) and 40 degrees (direction) when compared to simulated currents on a surveyed bathymetry. In the intertidal zone cBathy should be combined with a different method for bathymetry estimation in order to decrease these errors.
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Natural hazard
Disaster risk reduction
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Landslide RS survey includes the landslide recognition, the collection of the basic information, and the spatial analysis. With the Tiantaixiang landslide RS as an example, this paper illustrates the utilization of “special points” to determine the boundary and influence zone, movement characteristics and scale of the landslide. Landslide RS monitoring can be divided into direct RS monitoring and indirect RS monitoring. It is difficult to determine the exact time for large scale high velocity landslide movement, the scale of landslide movement is relatively small compared with the resolution of the satellite image, and as RS data are discontinuous and rather expensive, they are not quite suitable for RS direct landslide monitoring. Indirect monitoring means monitoring the environmental change caused by landslide activities. The Yigong landslide RS serves as another example to illustrate RS monitoring of lake change, ecological destruction and new landslides caused by landslide dam burst.Landslide RS evaluation means the evaluation of the stability, the prediction of the future activities, the detection of the affecting factors and the evaluation of the regional hazards caused by landslide development. Tiantaixiang and Qianjiangpin landslides and regional landslides in the Three Gorge area all serve as examples.
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The image features of landslides with different kinds of geological conditions,types and runout distances show great difference in remote sensing images with different resolutions.For long-runout landslide and complex landslide,the available interpretation keys are few,so that the identification of landslide mainly relies on ground survey.On the basis of the achievements of landslide remote sensing investigation obtained both in China and abroad and the remote sensing investigation projects for geological hazards,the authors analyzed the remote sensing image features of typical landslides,including Daqingkan Landslide,Qianjiangping Landslide,Wulong Landslide and 102 landslide group in Tibetan region.Then,the interpretation keys to landslides,especially to the high-speed and long-runout landslides,were summarized for colleagues'reference.
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Archipelago
Baltic sea
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