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首页> 外文期刊>Journal of Coastal Research: An International Forum for the Littoral Sciences >A Multiscale Analysis of Coral Reef Topographic Complexity Using Lidar-Derived Bathymetry
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A Multiscale Analysis of Coral Reef Topographic Complexity Using Lidar-Derived Bathymetry

机译：激光雷达测深法对珊瑚礁地形复杂性的多尺度分析

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摘要

Coral reefs represent one of the most irregular substrates in the marine environment. This roughness or topographic complexity is an important structural characteristic of reef habitats that affects a number of ecological and environmental attributes, including species diversity and water circulation. Little is known about the range of topographic complexity exhibited within a reef or between different reef systems. The objective of this study was to quantify topographic complexity for a 5-km x 5-km reefscape along the northern Florida Keys reef tract, over spatial scales ranging from meters to hundreds of meters. The underlying dataset was a 1-m spatial resolution, digital elevation model constructed from lidar measurements. Topographic complexity was quantified using a fractal algorithm, which provided a multi-scale characterization of reef roughness. The computed fractal dimensions (D) are a measure of substrate irregularity and are bounded between values of 2 and 3. Spatial patterns in D were positively correlated with known reef zonation in the area. Landward regions of the study site contain relatively smooth (D approximate to 2.35) flat-topped patch reefs, which give way to rougher (D approximate to 2.5), deep, knoll-shaped patch reefs. The seaward boundary contains a mixture of substrate features, including discontinuous shelf-edge reefs, and exhibits a corresponding range of roughness values (2.28 <= D <= 2.61).
机译：珊瑚礁是海洋环境中最不规则的基质之一。这种粗糙度或地形复杂性是礁生境的重要结构特征，影响许多生态和环境属性，包括物种多样性和水循环。对于珊瑚礁内部或不同珊瑚礁系统之间呈现的地形复杂性范围知之甚少。这项研究的目的是量化佛罗里达北部礁石沿5公里x 5公里的珊瑚礁地形的复杂性，其空间尺度从几米到几百米不等。基础数据集是一个1米的空间分辨率数字高程模型，由激光雷达测量结果构建。使用分形算法对地形复杂性进行了量化，该算法可对礁石粗糙度进行多尺度表征。计算出的分形维数（D）是基底不规则性的量度，范围在2和3之间。D中的空间格局与该地区已知的珊瑚礁分区呈正相关。研究地点的陆上区域包含相对光滑（D约2.35）的平顶斑块礁，而让位于较粗糙（D约2.5）的深，丘陵形斑块礁。向海边界包含基底特征（包括不连续的陆架边缘礁石）的混合物，并显示出相应的粗糙度值范围（2.28 <= D <= 2.61）。

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