Increase soil layer thickness below 8.6m

[akhter0907]

CLM5 default soil layer goes upto 8.6m thickness. This is not enough to represent deep groundwater table in locations such as High Plains Aquifer and North India.

Ideas to increase soil layer thickness below 8.6m:

1. Increase each layer thickness keeping the number of soil layers same.
2. Increase the number of soil layers.

[akhter0907]

1. Increasing soil layer thickness allows deeper water table (up to 80m), however, if bedrock is there, the water table is not realistic
2. W/o the bedrock, it tends to keep going deeper to settle at 80 m everywhere

[amansnama]

Increasing soil layer thickness allows deeper water table (up to 80m), however, if bedrock is there, the water table is not realistic W/o the bedrock, it tends to keep going deeper to settle at 80 m everywhere

Maybe providing initial water table depth (Fan et al. 2013) as applied in Felfelani et al. (2020)?

But, if water table is consistently settling at 80m even after years of model run, then water is leaking somehow. In this cae, the initial water table depth would not help.

[amansnama]

Sub-surface runoff (QDRAI) increased proportionally with increase in water table thickness. Since soil column thickness is increased, it increases water table thickness, increasing the drainage. This is possibly where the water is leaking to.