TY - JOUR
T1 - Variations of streambed vertical hydraulic conductivity before and after a flood season
AU - Wu, Guangdong
AU - Shu, Longcang
AU - Lu, Chengpeng
AU - Chen, Xunhong
AU - Zhang, Xiao
AU - Appiah-Adjei, Emmanuel K.
AU - Zhu, Jingsi
N1 - Funding Information:
This research was supported by the National Natural Science Foundation of China (41201029), the Colleges and Universities in Jiangsu Province Plans to Graduate Research and Innovation (2014B35714), the National Natural Science Foundation of China (41172203), Specialized Research Fund for the Doctoral Program of Higher Education of China (20120094120019), China Postdoctoral Science Foundation (2013 M540410), and the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research, IWHR - SKL - 201502). The authors thank the anonymous reviewers and editors for their valuable comments, which helped improve the quality of the manuscript significantly.
Publisher Copyright:
© 2015, Springer-Verlag Berlin Heidelberg.
PY - 2015/11/1
Y1 - 2015/11/1
N2 - 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 Kvfield 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 Kvvalues from layers 1–5 were obtained. The Kruskal-Wallis test on these Kvvalues 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 Kvvalues 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 Kvacross the stream differed before and after flood season; after the flood season, there was an increasing trend in Kvfrom the south bank to the north bank. Overall, the contrasts of Kvbefore and after the flood season were predominantly subject to the infiltration of fine particles.
AB - 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 Kvfield 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 Kvvalues from layers 1–5 were obtained. The Kruskal-Wallis test on these Kvvalues 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 Kvvalues 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 Kvacross the stream differed before and after flood season; after the flood season, there was an increasing trend in Kvfrom the south bank to the north bank. Overall, the contrasts of Kvbefore and after the flood season were predominantly subject to the infiltration of fine particles.
KW - China
KW - Groundwater statistics
KW - Groundwater/surface-water relations
KW - Temporal variability
KW - Vertical hydraulic conductivity
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U2 - 10.1007/s10040-015-1275-9
DO - 10.1007/s10040-015-1275-9
M3 - Article
AN - SCOPUS:84945469247
SN - 1431-2174
VL - 23
SP - 1603
EP - 1615
JO - Hydrogeology Journal
JF - Hydrogeology Journal
IS - 7
ER -