Jump to content
GMS, SMS, and WMS User Forum
Muluadwa

anisotropy factor ratio of KV to Kh

Recommended Posts

Hi everone,

Currently, I am calibrating a seepage face and flow rate towards a

quarry site using cross sectional model (2D). the model has been

calibrated well against the measured flow rate and groundwater level

from three observation bores along the section. I wonder if the ratio

Kv/Kh ~ 500 is realistic. The aquifer is sandy gravel overain by sandy

material.

I would like to justify this ratio and see if there are case studies,

documents relevant to the ratio of hydraulic conductivity ( vertical

vesus horizontal).

Could this be a none- uniqueness problem with model calibration.

Regads

Yohannes

Melbourne, Australia

Share this post


Link to post
Share on other sites

Hi everone,

Currently, I am calibrating a seepage face and flow rate towards a

quarry site using cross sectional model (2D). the model has been

calibrated well against the measured flow rate and groundwater level

from three observation bores along the section. I wonder if the ratio

Kv/Kh ~ 500 is realistic. The aquifer is sandy gravel overain by sandy

material.

I would like to justify this ratio and see if there are case studies,

documents relevant to the ratio of hydraulic conductivity ( vertical

vesus horizontal).

Could this be a none- uniqueness problem with model calibration.

Regads

Yohannes

Melbourne, Australia

From Freeze & Cherry 1979 p 32

"The primary cause of anisotropy of a small scale is the orientation of clay minerals in sedimentary rocks and unconsolidated sediments. Core samples of clays and shales seldom show horizontal to vertical anisotropy greater than 10:1, and it is usually less than 3:1."

However Freeze & Cheery note that, on a larger scale, layering of sediments can give values of 100:1 or even larger (page 34)

In both cases though, Kh > Kv.

Edited by woodward

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...