Method for finely describing heavy non-aqueous phase pollution site by fusing multi-source observation data

A heavy non-aqueous phase, observation data technology, applied in the direction of electric/magnetic detection, measuring device, earthwork drilling and mining for logging records, etc. problem, to achieve the effect of increasing the penetration rate and improving the estimation accuracy

Active Publication Date: 2021-03-12
NANJING UNIV
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Problems solved by technology

[0006] Purpose of the invention: In order to overcome the limitation of observation holes and ignore the space of the saturation of heavy non-aqueous liquid (DNAPL) in the process of estimating the structure of heavy non-aqueous phase liquid (DNAPL) pollution source area by hydraulic/fraction tracer chromatography (HPTT) The influence of the distribution on the water head data, the disturbing effect of the disso

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  • Method for finely describing heavy non-aqueous phase pollution site by fusing multi-source observation data
  • Method for finely describing heavy non-aqueous phase pollution site by fusing multi-source observation data
  • Method for finely describing heavy non-aqueous phase pollution site by fusing multi-source observation data

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like figure 1 As shown, in order to consider the influence of permeability on the spatial distribution of heavy non-aqueous phase liquid (DNAPL) saturation, the present invention proposes a method of fusing multi-source observation data to finely describe heavy non-aqueous phase polluted sites, which is divided into five stages Do the inversion:

[0030] Phase 1: Hydrodynamic tomography (HT) test is carried out on the contaminated site, the same wellbore is divided into many vertical well sections with water stoppers, water is pumped or injected in different well sections of different wellbores in sequence, and water is injected in other wells By monitoring the water level response in each section, a series of continuous intersecting hole da...

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Abstract

The invention discloses a method for finely describing a heavy non-aqueous phase pollution site by fusing multi-source observation data, which is based on a loop iteration method of ensemble Kalman filtering, fully considers the influence of saturation priori information of heavy non-aqueous phase liquid (DNAPL) on water head data, and improves the estimation precision of a heavy non-aqueous phaseliquid (DNAPL) pollution source. According to the method, a coupled hydrological geophysical inversion framework is established, a heavy non-aqueous phase liquid (DNAPL) multiphase flow model and a resistivity tomography (ERT) model are coupled, multi-source observation data such as a water head, tracer agent concentration and resistivity are fused, and the heterogeneous distribution of an aquifer and the fine depiction degree of a heavy non-aqueous phase liquid (DNAPL) pollution source area structure are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of pollution source identification in the field of hydrogeology, and in particular relates to a method for finely describing heavy non-aqueous phase polluted sites by fusing multi-source observation data. Background technique [0002] Heavy non-aqueous phase liquid (DNAPL) contamination is prevalent around the world. Once leaked into the ground, the high density, low interfacial tension, and low viscosity properties of heavy non-aqueous phase liquids (DNAPL) make them difficult to remove and lead to them becoming a long-term source of groundwater pollution. When DNAPL is released into the subsurface, DNAPL becomes trapped in pores forming discontinuous discrete or pooled DNAPL above regions of low permeability . The spatial distribution of heavy non-aqueous phase liquids (DNAPL) in subsurface media is affected by the heterogeneity of the permeability coefficient, and a detailed description of subsurface aq...

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Application Information

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IPC IPC(8): G01V3/18G01V3/38E21B47/11E21B49/00
CPCE21B49/00G01V3/18G01V3/38
Inventor 施小清郭琼泽徐红霞孙媛媛吴吉春许伟伟任静华
Owner NANJING UNIV
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