The Effects of Protruding Rock Boulders in Regulating Sediment Intrusion within the Hyporheic Zone of Mountain Streams

作     者：Dimitrios DERMISIS A.N.Thanos PAPANICOLAOU 

作者机构：Department of Chemical Civil and Mechanical Engineering Mc Neese State UniversityLake Charles LA 70609 USA Department of Civil and Environmental Engineering The University of TennesseeKnoxville TN 37996 USA 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2014年第11卷第6期

页      面：1466-1477页

核心收录：

学科分类：08[工学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 

基　　金：support provided by the NSF Hydroscience Division (Grant Nos. EAR-0208358  GEO-1419073  CBET-1033732) 

主　　题：Spawning Gravel Boulders Sand Intrusion Sedimentation 

摘      要：Excessive 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 *** 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 ***).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 *** 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 *** exponential decrease of the amount of the infiltrated sand within the hyporheic zone was observed in all experiments regardless of the presence of ***,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 whenboulders were *** 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.