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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11702

Title: Variations of streambed vertical hydraulic conductivity before and after a flood season
Authors: Wu, Guangdong
Shu, Longcang
Lu, Chengpeng
Chen, Xunhong
Zhang, Xiao
Appiah-Adjei, Emmanuel Kwame
Zhu, Jingsi
Keywords: China
Groundwater/surface-water relations
Vertical hydraulic conductivity
Groundwater statistics
Temporal variability
Issue Date: 2015
Publisher: Hydrogeology Journal
Citation: Hydrogeology Journal, (2015) 23: 1603–1615; DOI 10.1007/s10040-015-1275-9
Abstract: The change of vertical hydraulic conductivity (Kv) before and after a flood season is crucial in understanding the long-term temporal variation of streambed permeability. Therefore, in this study, a detailed Kv field investigation was conducted at an in-channel site within the Dawen River, China, before and after a flood season. In-situ falling-head permeameter tests were performed for the determination of Kv. The tests were conducted using a 10 × 10 grid, at five different depths. In total, 871 valid Kv values from layers 1–5 were obtained. The Kruskal-Wallis test on these Kv values before and after the flood season shows they belonged to different populations. The sediments before the flood season primarily consisted of sand and gravel, whereas after the flood season, patchy distribution of silt/clay occurred in the sandy streambed and silt/clay content increased with the increasing depth; under the losing condition during flooding, downward movement of water brought fine particles into the coarse sediments, partially silting the pores. Accordingly, the Kv values after the flood season had a smaller mean and median, and a higher level of heterogeneity, compared to those before the flood season. Additionally, the distribution pattern in Kv across the stream differed before and after flood season; after the flood season, there was an increasing trend in Kv from the south bank to the north bank. Overall, the contrasts of Kv before and after the flood season were predominantly subject to the infiltration of fine particles.
Description: An article published in Hydrogeology Journal, (2015) 23: 1603–1615; DOI 10.1007/s10040-015-1275-9
URI: http://hdl.handle.net/123456789/11702
Appears in Collections:College of Engineering

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