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首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >Mapping intertidal estuarine sediment grain size distributions through airborne remote sensing
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Mapping intertidal estuarine sediment grain size distributions through airborne remote sensing

机译：通过机载遥感绘制潮间带河口沉积物粒度分布图

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The intertidal environments of estuaries represent critical exchange environments of sediment and sediment bound contaminants. Ecological and sedimentological related investigations of these environments require monitoring methods that provide rapid spatially representative data on sediment grain size distribution. Remote sensing has the potential to provide synoptic information of intertidal environments. Previous in situ and laboratory-based reflectance investigations have demonstrated that for effective quantification of sediment grain size distributions, remote sensing platforms must include measurements within the short-wave infrared (SWIR). In addition, the timing of image acquisition, in relation to tidal cycles and sediment moisture content, is critical in optimising the spectral differences between the coarser sand and finer 'mud' fraction of sediments. Daedalus 1268 Airborne Thematic Mapper (ATM) has been identified as an appropriate platform and sensor for providing accurate synoptic maps of estuarine sediment distributions. This paper presents the results from the application of ATM 1.75 m resolution data to the mapping of surface sediment grain-size distributions across intertidal areas of Ribble Estuary, Lancashire, UK. ATM imagery was acquired after the intertidal area was exposed to strong summer drying conditions. Pre-processing and linear unmixing of the imagery collected of the intertidal zone following a period of drying allowed accurate sub-pixel determinations (1.75 in resolution) of sediment clay (r(2)=0.79) but less accurate for sand (r(2)=0.60). The results also demonstrate deterioration in the image calibration with increasing sediment moisture content and microphytobenthos cover. However, recombining the subpixel end member abundances through multivariate regression analysis improved the image calibration significantly for both sediment clay and sand content (r(2) >0.8) for imagery collected in both dryer and wetter conditions. These results demonstrate that ATM data, or similar, can be used to gain quantitative information on intertidal sediment distributions and such data has application to a wide variety of estuarine research. (C) 2003 Elsevier Inc. All rights reserved. [References: 22]
机译：河口的潮间环境代表了沉积物和与沉积物结合的污染物的临界交换环境。这些环境的生态学和沉积学相关研究需要监测方法，以提供关于沉积物粒度分布的快速空间代表性数据。遥感有可能提供潮间带环境的天气信息。先前的基于原位和实验室的反射率研究表明，为了有效量化沉积物粒径分布，遥感平台必须在短波红外（SWIR）范围内进行测量。此外，与潮汐周期和沉积物水分含量相关的图像采集时间，对于优化较粗的沙粒和较细的“泥”质沉积物之间的光谱差异至关重要。 Daedalus 1268空中专题测绘仪（ATM）已被确定为提供准确的河口沉积物分布概要地图的合适平台和传感器。本文介绍了将ATM 1.75 m分辨率数据应用于英国兰开夏郡里布尔河口潮间带潮间带表面沉积物粒度分布图的结果。在潮间带地区暴露于强烈的夏季干燥条件后，获取了ATM图像。干燥一段时间后，对潮间带收集到的图像进行预处理和线性分解，可以对沉积物黏土（r（2）= 0.79）进行精确的亚像素确定（分辨率为1.75），而对于沙子（r（2）则不那么准确）= 0.60）。结果还表明，随着沉积物水分含量的增加和微型底栖动物的覆盖率的提高，图像校准也将恶化。但是，通过多变量回归分析重新组合子像素末端成员的丰度，对于在干燥和潮湿条件下收集的图像，泥沙和砂含量（r（2）> 0.8）均显着改善了图像校准。这些结果表明，ATM数据或类似数据可用于获取潮间带沉积物分布的定量信息，并且此类数据已应用于多种河口研究。 （C）2003 Elsevier Inc.保留所有权利。 [参考：22]

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