OBSERVED MIGRATION OF A CONTROLLED DNAPL RELEASE BY GEOPHYSICAL METHODS

被引:123
作者
BREWSTER, ML
ANNAN, AP
GREENHOUSE, JP
KUEPER, BH
OLHOEFT, GR
REDMAN, JD
SANDER, KA
机构
[1] KOMEX INT LTD,CALGARY,AB T3B 0M6,CANADA
[2] QUEENS UNIV,DEPT CIVIL ENGN,KINGSTON,ON K7L 3N6,CANADA
[3] US GEOL SURVEY,DENVER FED CTR,DENVER,CO 80225
[4] COLORADO SCH MINES,GOLDEN,CO 80401
关键词
D O I
10.1111/j.1745-6584.1995.tb00043.x
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Seven hundred seventy liters of a dense nonaqueous phase liquid (DNAPL), tetrachloroethylene (PCE), were released into an isolated volume of a completely saturated natural sandy aquifer. The release was monitored over a period of 984 hours with a variety of geophysical methods including ground penetrating radar, time domain reflectometry, in situ resistivity, and a neutron soil moisture probe. The PCE formed a pool on a low permeability layer at approximately 1 m depth and spread over an area exceeding 32 m(2). In its course of downward migration, the PCE subsequently formed eight smaller pools. At the end of the experiment an estimated 41 percent of the total PCE volume remained trapped in the upper pool. The PCE mass and its spatial moments were calculated from radar reflection amplitudes. Between 48 and 100 percent of the PCE mass was accounted for by radar measurements. The center of mass moved a total of 0.5 m south southeast and 1.3 m downward. Spatial variances showed that the greatest lateral spreading occurred in the east-west direction. The results demonstrate that natural heterogeneities, even in a relatively homogeneous aquifer, can cause DNAPLs to spread laterally over large areas in the subsurface. This experiment also demonstrated that while the ability of geophysics to uniquely measure the presence of DNAPL is limited, certain techniques are well-suited to monitoring changes in DNAPL saturation.
引用
收藏
页码:977 / 987
页数:11
相关论文
共 24 条
[1]   A MULTIPHASE APPROACH TO THE MODELING OF POROUS-MEDIA CONTAMINATION BY ORGANIC-COMPOUNDS .2. NUMERICAL-SIMULATION [J].
ABRIOLA, LM ;
PINDER, GF .
WATER RESOURCES RESEARCH, 1985, 21 (01) :19-26
[2]  
Bohla J., 1986, THESIS U WATERLOO WA
[3]   GROUND-PENETRATING RADAR MONITORING OF A CONTROLLED DNAPL RELEASE - 200 MHZ RADAR [J].
BREWSTER, ML ;
ANNAN, AP .
GEOPHYSICS, 1994, 59 (08) :1211-1221
[4]  
BREWSTER ML, 1993, THESIS U WATERLOO WA
[5]  
FAUST CR, 1990, WATER RESOUR RES, V27, P423
[7]  
KOEFOED O, 1980, GEOPHYSICS, V45, P1269
[8]  
Kueper B.H., 1991, WATER RESOUR RES, V27, P1058
[9]   A FIELD EXPERIMENT TO STUDY THE BEHAVIOR OF TETRACHLOROETHYLENE BELOW THE WATER-TABLE - SPATIAL-DISTRIBUTION OF RESIDUAL AND POOLED DNAPL [J].
KUEPER, BH ;
REDMAN, D ;
STARR, RC ;
REITSMA, S ;
MAH, M .
GROUND WATER, 1993, 31 (05) :756-766
[10]  
KUEPER BH, 1989, J CONTAM HYDROL, V5, P88