Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR027603 |
Intermittent Channel Systems of a Low‐Relief, Low‐Gradient Floodplain: Comparison of Automatic Extraction Methods | |
Haiqing Xu; Shailesh van der Steeg; Jessica Sullivan; David Shelley; John E. Cely; Enrica Viparelli; Venkat Lakshmi; Raymond Torres | |
2020-08-10 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | Intermittent floodplain channels are low‐relief conduits etched into the floodplain surface and remain dry much of the year. These channels comprise expansive systems and are important because during low level inundation they facilitate lateral hydraulic connectivity throughout the floodplain. Nevertheless, few studies have focused on these floodplain channel systems due to uncertainty in how to identify and characterize these systems in digital elevation models (DEMs). In particular, their automatic extraction from widely available DEMs is challenging due to the characteristically low‐relief and low‐gradient topography of floodplains. We applied three channel extraction approaches to the Congaree River floodplain DEM and compared the results to a channel reference map created through numerous field excursions over the past 30 years. The methods that we tested are based on flow accumulation area, topographic curvature and mathematical morphology, or the D8, Laplacian and bottom‐hat transform (BHT), respectively. Of the 198 km of reference channels the BHT, Laplacian, and D8 extracted 83%, 71%, and 23%, respectively, and the BHT consistently had the highest agreement with the reference network at the local (5 m) and regional (10 km) scales. The extraction results also include commission “error”, augmenting the reference map with about 100 km of channel length. Overall, the BHT method provided the best results for channel extraction, giving over 298 km in 69 km2 with a detrended regional relief of 1.9 m. Further, these analyses allow us to shed light on the meaning and use of the term “low relief landscapes”. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/287827 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Haiqing Xu,Shailesh van der Steeg,Jessica Sullivan,等. Intermittent Channel Systems of a Low‐Relief, Low‐Gradient Floodplain: Comparison of Automatic Extraction Methods[J]. Water Resources Research,2020. |
APA | Haiqing Xu.,Shailesh van der Steeg.,Jessica Sullivan.,David Shelley.,John E. Cely.,...&Raymond Torres.(2020).Intermittent Channel Systems of a Low‐Relief, Low‐Gradient Floodplain: Comparison of Automatic Extraction Methods.Water Resources Research. |
MLA | Haiqing Xu,et al."Intermittent Channel Systems of a Low‐Relief, Low‐Gradient Floodplain: Comparison of Automatic Extraction Methods".Water Resources Research (2020). |
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