1 / 15

Understanding Constant Concentration and Injection Well Dynamics in Groundwater Models

This resource delves into the principles of constant concentration and injection well management within groundwater models, focusing on the recharge dynamics at boundary conditions or within model interiors. It addresses mass flux considerations, chemical reaction impacts, and numerical challenge analysis, particularly regarding Peclet number and numerical error in remediation scenarios. Example problem sets illustrate breakthrough curve generation under varying assumptions, enhancing comprehension of the interaction between source terms and chemical behavior in confined and unconfined layers.

liz
Télécharger la présentation

Understanding Constant Concentration and Injection Well Dynamics in Groundwater Models

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Source Terms • Constant Concentration • Injection Well • Recharge May be introduced at the boundary or in the interior of the model

  2. Q Constant Concentration (Z&B, p. 283) cs e.g., NAPL source area at boundary

  3. Injection Well Qcs well

  4. Recharge R, cs Mass Flux = R (x y)cs

  5. Problem Set #3 Source Terms and Chemical Reactions • Constant Concentration • Injection Well • Recharge • retardation • 1st order decay

  6. Confined layers Problem Set #3 Two Layers This screen shows a constant concentration source. Contours of head are also shown.

  7. Note the water table Flow field for an unconfined upper layer with areal recharge and a recharge source cell.

  8. Problem Set #3 Parts 1 and 2: Produce breakthrough curves under different assumptions about the source term and chemical reactions.

  9. Numerical error caused by high Peclet number Problem Set #3 – Part 3 - Remediation TVD Solution

  10. Central Finite Difference Solution

  11. Numerical error caused by high Peclet number Problem Set #3 – Part 3 - Remediation TVD Solution

  12. Cr < 1 Courant Number Pe < 4 Peclet Number

  13. 50 m grid Pumping well is represented by 4 nodes

  14. TVD solution 50 m grid spacing upper left node in the pumping complex Peclet number = 2.5 100 m grid spacing Peclet number = 5

  15. TVD Solution 50 m grid – near center of pumping compex 100 m grid

More Related