Innovative tidal notch detection using TLS and fuzzy logic: Implications for palaeo-shorelines from compressional (Crete) and extensional (Gulf of Corinth) tectonic settings
Innovative tidal notch detection using TLS and fuzzy logic: Implications for palaeo-shorelines from compressional (Crete) and extensional (Gulf of Corinth) tectonic settings
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DOI：
10.1016/j.geomorph.2017.01.028
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发表时间：
2017-04
期刊：
影响因子：
3.9
通讯作者：
S. Schneiderwind;S. Boulton;I. Papanikolaou;K. Reicherter
中科院分区：
文献类型：
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作者：
S. Schneiderwind;S. Boulton;I. Papanikolaou;K. Reicherter
潮汐缺口是一个普遍接受的海平面标志，并保持特别的兴趣，古地震研究，因为沿海地震活动可能会取代他们从他们的成因位置。后续地震事件的结果是一个缺口序列，反映了累积的海岸隆起。为了评估保存的缺口序列，一个创新的和跨学科的工作流程，准确地突出了古海平面标志物的证据。该工作流程使用来自地面激光扫描的数据，并迭代地结合高分辨率曲率分析、高性能边缘检测和特征提取。基于潮汐缺口顶部等残留物形成凸模式的假设，对主曲率图像进行边缘检测。此外，一个标准的算法进行比较，从一个自定义的模糊逻辑方法的边缘检测结果。结果通过Hough变换，以提取几乎水平方向的连续线特征。该工作流程最初是在克里特岛南部的一个单一的、独特的和有遮蔽的曝光上开发的，后来在波拉科拉半岛不同沿海悬崖的激光扫描上成功地进行了测试。这种方法允许详细检查否则无法访问的位置和横向和三维几何形状的评估，因此，即使在开发不足的情况下，也可以识别以前未被识别的海平面标志的证据。对整个悬崖暴露的高分辨率激光扫描可以量化局部变化。边缘检测的目的是减少信息的表面曲率和霍夫变换限制的结果对方向和连续性。因此，所提出的客观的方法，提高了认识的潮汐缺口，并支持古地震研究的空间信息和准确的测量水平运动，超越了传统的调查过程中认识到的。这对于确定伸展构造环境中的古海岸线特别有用，在伸展构造环境中，同震下盘隆起（每次事件仅为净滑动的1/2至1/4）不太可能将整个槽口抬高到潮差以上。
Tidal notches are a generally accepted sea-level marker and maintain particular interest for palaeoseismic studies since coastal seismic activity potentially displaces them from their genetic position. The result of subsequent seismic events is a notch sequence reflecting the cumulative coastal uplift. In order to evaluate preserved notch sequences, an innovative and interdisciplinary workflow is presented that accurately highlights evidence for palaeo-sea-level markers. The workflow uses data from terrestrial laser scanning and iteratively combines high-resolution curvature analysis, high performance edge detection, and feature extraction. Based on the assumptions that remnants, such as the roof of tidal notches, form convex patterns, edge detection is performed on principal curvature images. In addition, a standard algorithm is compared to edge detection results from a custom Fuzzy logic approach. The results pass through a Hough transform in order to extract continuous line features of an almost horizontal orientation. The workflow was initially developed on a single, distinct, and sheltered exposure in southern Crete and afterwards successfully tested on laser scans of different coastal cliffs from the Perachora Peninsula. This approach allows a detailed examination of otherwise inaccessible locations and the evaluation of lateral and 3D geometries, thus evidence for previously unrecognised sea-level markers can be identified even when poorly developed. High resolution laser scans of entire cliff exposures allow local variations to be quantified. Edge detection aims to reduce information on the surface curvature and Hough transform limits the results towards orientation and continuity. Thus, the presented objective methodology enhances the recognition of tidal notches and supports palaeoseismic studies by contributing spatial information and accurate measurements of horizontal movements, beyond that recognised during traditional surveys. This is especially useful for the identification of palaeo-shorelines in extensional tectonic environments where coseismic footwall uplift (only 1/2 to 1/4 of net slip per event) is unlikely to raise an entire notch above the tidal range.