Determining in-channel (dead zone) transient storage by comparing solute transport in a bedrock channel-alluvial channel sequence, Oregon

被引:95
作者
Gooseff, MN [1 ]
LaNier, J
Haggerty, R
Kokkeler, K
机构
[1] Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO 80401 USA
[2] Oregon State Univ, Dept Geosci, Corvallis, OR 97331 USA
关键词
D O I
10.1029/2004WR003513
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
[ 1] Current stream tracer techniques do not allow separation of in-channel dead zone ( e. g., eddies) and out-of-channel ( hyporheic) transient storage, yet this separation is important to understanding stream biogeochemical processes. We characterize in-channel transient storage with a rhodamine WT solute tracer experiment in a 304 m cascade-pool-type bedrock reach with no hyporheic zone. We compare the solute breakthrough curve ( BTC) from this reach to that of an adjacent 367 m alluvial reach with significant hyporheic exchange. In the bedrock reach, transient storage has an exponential residence time distribution with a mean residence time of 3.0 hours and a ratio of transient storage to stream volume of 0.14, demonstrating that at moderate discharge, bedrock in-channel storage zones provide a small volume of transient storage with substantial residence time. In the alluvial reach, though pools are similar in size to those in the bedrock reach, transient storage has a power law residence time distribution with a mean residence time of > 100 hours ( estimated at nearly 1200 hours) and a ratio of storage to stream volume of 105. Because the in-channel hydraulics of bedrock reaches are simpler than alluvial step-pool reaches, the bedrock results are probably a lower end-member with respect to volume and residence time, though they demonstrate that in-channel storage may be appreciable in some reaches. These results suggest that in-stream dead zone transient storage may be accurately simulated by exponential RTDs but that hyporheic exchange is better simulated with a power law RTD as a consequence of more complicated flow path and exchange dynamics.
引用
收藏
页码:1 / 7
页数:8
相关论文
共 25 条
[1]  
[Anonymous], 1998, SOLUTE TRANSPORT MOD
[2]  
Bard Y., 1974, Nonlinear Parameter Estimation
[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]   SURFACE-SUBSURFACE WATER INTERACTIONS IN AN ALLUVIATED MOUNTAIN STREAM CHANNEL [J].
CASTRO, NM ;
HORNBERGER, GM .
WATER RESOURCES RESEARCH, 1991, 27 (07) :1613-1621
[5]   Characterizing multiple timescales of stream and storage zone interaction that affect solute fate and transport in streams [J].
Choi, J ;
Harvey, JW ;
Conklin, MH .
WATER RESOURCES RESEARCH, 2000, 36 (06) :1511-1518
[6]   Denitrification and hydrologic transient storage in a glacial meltwater stream, McMurdo Dry Valleys, Antarctica [J].
Gooseff, MN ;
McKnight, DM ;
Runkel, RL ;
Duff, JH .
LIMNOLOGY AND OCEANOGRAPHY, 2004, 49 (05) :1884-1895
[7]   Comparing transient storage modeling and residence time distribution (RTD) analysis in geomorphically varied reaches in the Lookout Creek basin, Oregon, USA [J].
Gooseff, MN ;
Wondzell, SM ;
Haggerty, R ;
Anderson, J .
ADVANCES IN WATER RESOURCES, 2003, 26 (09) :925-937
[8]  
GRAF JB, 1995, WATER RESOUR BULL, V31, P265
[9]   On the late-time behavior of tracer test breakthrough curves [J].
Haggerty, R ;
McKenna, SA ;
Meigs, LC .
WATER RESOURCES RESEARCH, 2000, 36 (12) :3467-3479
[10]   Modeling mass transfer processes in soil columns with pore-scale heterogeneity [J].
Haggerty, R ;
Gorelick, SM .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1998, 62 (01) :62-74