By Iichiro Kono; Makato Nishigaki; Mitsuru Komatsu
Read Online or Download Groundwater engineering : recent advances : proceedings of the International Symposium on Groundwater Problems Related to Geo-environment, Okayama, Japan, 28-30 May 2003 PDF
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Extra resources for Groundwater engineering : recent advances : proceedings of the International Symposium on Groundwater Problems Related to Geo-environment, Okayama, Japan, 28-30 May 2003
Sample text
The results of the particle tracking simulations shown in Figure 9 (using MODPATH), show the flow paths of particles introduced at the injection wells at the source zone prior to and after the PCE spill. As can be seen from Figure 9, the flow bypasses the entrapped PCE zone (see dash ellipses). Therefore, it should be expected that the injected surfactant solution will bypass the entrapment zone, thus reducing the effectiveness of the remediation. 06 m thick. Two constant-head supplies are used to maintain a steady hydraulic gradient throughout the experiment.
2001a&b). 3 of UTCHEM. The location of the source zone is shown in Figure 6. The source zone is discretized into 40 layers and 24 columns. The capillary pressure-saturation relationship assumes Brooks-Corey drainage model. 0 L d−1. The spill location is at the center of the top layer. The spill simulation was conducted for a long time for the spill (migration of PCE) to reach a static state. The resulting simulated PCE distribution is shown in Figure 8. As can be seen from the distribution pattern, most of the PCE is entrapped in high permeability zones.
1996; Dekker & Abriola, 2000). These models in general are designed to solve a coupled set of partial differential equations: unless a large fraction of the entrapped NAPL free phase is removed. In other words, the reduction of dissolved contaminant concentration of the downstream plume may not be achieved unless significant fraction of NAPL in the source zone is removed. It should be noted that Sale and McWhorter (2001) study was conducted under very simplistic conditions. These simplifications include, uniform flow fields, simple entrapment architecture that consisted of a number of NAPL pools and a dissolution model that did not allow for changes in the NAPL saturation.