Effects of background water composition on stream-subsurface exchange of submicron colloids

被引:53
作者
Ren, JH [1 ]
Packman, AI [1 ]
机构
[1] Northwestern Univ, Dept Civil & Environm Engn, Evanston, IL 60201 USA
来源
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE | 2002年 / 128卷 / 07期
关键词
colloids; sediment transport; sediment deposits; streams;
D O I
10.1061/(ASCE)0733-9372(2002)128:7(624)
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
While very fine sediments (colloids) are normally assumed to be readily transported downstream without deposition, recent evidence suggests that these particles will often deposit into streambeds due to a combination of physical and chemical mechanisms. This study investigates a regime of particle deposition where settling is unimportant and thus where particle deposition can only result from advective stream-subsurface exchange followed by deep-bed filtration. Laboratory flume experiments were conducted to examine the deposition of 0.45 mum diameter silica colloids into a silica sand bed. This system was selected for study because submicron sized colloids will not settle and silica colloid filtration by silica sand is generally quite low. Despite the lack of settling and the weak particle-particle interactions, the ongoing interfacial flux of colloids to the subsurface still produced significant filtration of silica colloids over the course of the experiments. Variation of the background ionic strength caused significant modification of filtration behavior and silica colloid deposition. In addition, cleaning the sand surface with mild acid and base washes reduced both filtration and net colloid exchange. These experimental results are interpreted in terms of a fundamentally based physicochemical model which predicts net particle deposition based on stream and subsurface hydrodynamic conditions and subsurface filtration. These results show that both particle surface chemical conditions and background water chemistry play a critical role in controlling the net transport and deposition of fine sediments. It is important to recognize the effects of physicochemical processes both when designing laboratory experiments and when analyzing environmental particle transport.
引用
收藏
页码:624 / 634
页数:11
相关论文
共 41 条
[1]   LARGE-SCALE DISTRIBUTION OF METAL CONTAMINATION IN THE FINE-GRAINED SEDIMENTS OF THE CLARK FORK RIVER, MONTANA, USA [J].
AXTMANN, EV ;
LUOMA, SN .
APPLIED GEOCHEMISTRY, 1991, 6 (01) :75-88
[2]  
Bear J., 1988, DYNAMICS FLUIDS PORO
[3]   SIMULATION OF SOLUTE TRANSPORT IN A MOUNTAIN POOL-AND-RIFFLE STREAM - A TRANSIENT STORAGE MODEL [J].
BENCALA, KE ;
WALTERS, RA .
WATER RESOURCES RESEARCH, 1983, 19 (03) :718-724
[4]   METAL BEHAVIOR DURING SURFACE GROUNDWATER INTERACTION, SILVER-BOW CREEK, MONTANA [J].
BENNER, SG ;
SMART, EW ;
MOORE, JN .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1995, 29 (07) :1789-1795
[5]   Transfer of nonsorbing solutes to a streambed with bed forms: Laboratory experiments [J].
Elliott, AH ;
Brooks, NH .
WATER RESOURCES RESEARCH, 1997, 33 (01) :137-151
[6]   Transfer of nonsorbing solutes to a streambed with bed forms: Theory [J].
Elliott, AH ;
Brooks, NH .
WATER RESOURCES RESEARCH, 1997, 33 (01) :123-136
[7]  
FAURE G, 1991, PRINCIPALS APPL INOR
[8]   Reactive uptake of trace metals in the hyporheic zone of a mining-contaminated stream, Pinal Creek, Arizona [J].
Fuller, CC ;
Harvey, JW .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2000, 34 (07) :1150-1155
[10]   THE EFFECT OF STREAMBED TOPOGRAPHY ON SURFACE-SUBSURFACE WATER EXCHANGE IN MOUNTAIN CATCHMENTS [J].
HARVEY, JW ;
BENCALA, KE .
WATER RESOURCES RESEARCH, 1993, 29 (01) :89-98