IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2014  > Vol11 No.6
The Effects of Protruding Rock Boulders in Regulating Sediment Intrusion within the Hyporheic Zone of Mountain Streams
Dimitrios DERMISIS; A.N. Thanos PAPANICOLAOU
Corresponding AuthorA.N. Thanos PAPANICOLAOU
2014-11
Source PublicationJournal of Mountain Science
Volume11Issue:6Pages:1466-1477
AbstractExcessive sedimentation in mountain stream ecosystems is a critical environmental problem due to the clogging of streambeds by sediment particles within the hyporheic zone, with detrimental effects on fish spawning habitat. In this research, the effects of an array of boulders in regulating the intrusion of incoming sand within a gravel substrate were evaluated by performing detailed experiments in a laboratory flume. A unique experimental setup and two different sampling techniques were utilized for measuring the infiltrated sand within the gravel bed under two bed shear stress conditions (moderate vs. high). For comparison purposes, experiments were performed without and with the presence of partially submerged to the flow (protruding) boulders, which is typical for the average flow conditions found in mountain streams. Results indicated that sand infiltrated primarily in the upper part of the gravel bed creating a surface seal which hindered the penetration of sand particles deeper into the bed. An exponential decrease of the amount of the infiltrated sand within the hyporheic zone was observed in all experiments regardless of the presence of boulders. However, the presence of boulders promoted sediment intrusion of sand particles especially for the moderate applied bed shear stress condition, since the total amount of the infiltrated sand was found to be on average 44% greater when boulders were present. The findings from this study can provide additional insight regarding the role of boulders on promoting downwelling of flow and sediment within the gravel substrate with potential effects on fish habitat.
KeywordSpawning Gravel Boulders Sand Intrusion Sedimentation
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/7415
CollectionJournal of Mountain Science_Journal of Mountain Science-2014_Vol11 No.6
Corresponding AuthorA.N. Thanos PAPANICOLAOU
Recommended Citation
GB/T 7714
Dimitrios DERMISIS,A.N. Thanos PAPANICOLAOU. The Effects of Protruding Rock Boulders in Regulating Sediment Intrusion within the Hyporheic Zone of Mountain Streams[J]. Journal of Mountain Science,2014,11(6):1466-1477.
APA Dimitrios DERMISIS,&A.N. Thanos PAPANICOLAOU.(2014).The Effects of Protruding Rock Boulders in Regulating Sediment Intrusion within the Hyporheic Zone of Mountain Streams.Journal of Mountain Science,11(6),1466-1477.
MLA Dimitrios DERMISIS,et al."The Effects of Protruding Rock Boulders in Regulating Sediment Intrusion within the Hyporheic Zone of Mountain Streams".Journal of Mountain Science 11.6(2014):1466-1477.
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