|Table of Contents|

Study on an analytical model for the assessment of accidental pollution(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2012年第01期
Page:
72-78，95
Research Field:
水资源与环境
Publishing date:

Info

Title:
Study on an analytical model for the assessment of accidental pollution
Author(s):
CHEN Jia-jun1; 2;  WANG Hao1; 2;  QUAN Xiang-chun1; 2;  WEN Jun3
1. Key Laboratory for Water and Sediment Sciences of Ministry of Education, Beijing Normal University, Beijing 100875, China; 2. School of Environment, Beijing Normal University, Beijing 100875, China; 3. Xinjiang Water Conservancy and Hydropower Survey and Design Institute, Urumqi 830091, Xinjiang, China
Keywords:
accidental pollution;  contaminated site;  rainfall infiltration;  unsaturated zone;  saturated zone;  solute transport;  analytic solution;  model
PACS:
P641; X52
DOI:
-
Abstract:
In order to immediately and effectively deal with kinds of accidental pollution, it is necessary to develop a convenient and practical mathematical model which can be used for most kinds of contaminant at an contaminated site. Free infiltration model and rainfall infiltration model for contaminant transport were established based on the generalization of contaminant migration in unsaturated and saturated zones after the pollution accident, and the corresponding analytic solutions were obtained. Considering the infiltration downward of contaminant in unsaturated zone by gravity, a one-dimension vertical infiltration model for contaminant transport was established under no rainfall condition. Considering the convection, diffusion, volatilization, biodegradation, adsorption and root uptake in the process of contaminant migration in contaminated site(unsaturated zone), a sectional two-dimension solute transport model for unsaturated zone and a planar two-dimension solute transport model for saturated zone were established under rainfall condition. The hypothesis of the model included that the distribution of rainfall was uniform; soil texture, hydraulic property and kind of organic matter were uniform within each zone; the action between contaminant and porous medium was linear sorption; the root uptake obeyed the first order kinetics. According to the analytic solutions of the established model, the simulation case was performed. The simulation results showed that the application was wide; the simulation was effective. The model could predict the degradation and migration of contaminant in unsaturated zone and saturated zone, and the time required for contaminant to migrate into saturated zone.

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Last Update: 2012-03-20