Search found 19 matches

by goitomta
Tue Sep 05, 2017 10:41 am
Forum: Hydrus 1D
Topic: Inverse problem
Replies: 0
Views: 11654

Inverse problem

Greetings, I am inverse modeling a cumulative drainage (time) data obtained from a multistep outflow experiment set on a 5 bar pressure plate. I am treating the profile as a two material type (soil and ceramic plate). I am wondering if there is any saturated hydraulic conductivity value (default) fo...
by goitomta
Mon Mar 20, 2017 1:11 pm
Forum: HYDRUS (2D/3D)
Topic: Soil and solute specific parameters
Replies: 7
Views: 6400

Re: Soil and solute specific parameters

Thanks Jirka In studying water and solute transport from sludge burial sites with a setting described by soil-sludge-soil-gravel layers (top to bottom sequencing) all sitting on 1m by 1m pan having 0.1 m high with the drain hole of 5cm diameter located at the center of the pan. The drain hole was co...
by goitomta
Wed Mar 15, 2017 2:48 pm
Forum: HYDRUS (2D/3D)
Topic: Soil and solute specific parameters
Replies: 7
Views: 6400

Re: Soil and solute specific parameters

A sewage sludge was buried below a soil surface with the configuration consists of 30 cm depth top soil layer covering a 25 cm deep sludge which in turn overlying 65 cm deep soil all siting in a pan lysimeter (1m by 1m) filled with gravel layer that allow the drainage water to pass through and colle...
by goitomta
Wed Mar 08, 2017 3:06 pm
Forum: HYDRUS (2D/3D)
Topic: Soil and solute specific parameters
Replies: 7
Views: 6400

Re: Soil and solute specific parameters

Thanks Jirka!
by goitomta
Tue Mar 07, 2017 12:21 pm
Forum: HYDRUS (2D/3D)
Topic: Soil and solute specific parameters
Replies: 7
Views: 6400

Soil and solute specific parameters

I am using Hydrus-2D/3D model to simulate nitrate, ammonia and ortho-phosphate leaching trends from a sewage sludge buried below a soil surface. The soil textural types where this sludge are buried include loam, sandy clay, sandy clay loam, silty clay, and clay loam. I need to input soil specific (D...
by goitomta
Wed Nov 21, 2012 2:55 pm
Forum: HYDRUS (2D/3D)
Topic: Water fluxes at observation nodes
Replies: 10
Views: 11995

Thanks Jirka for the quick solution. The velocity vectors have indicated me positive fluxes are downward. Goitom <blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Jirka</i> Goitom, This will depend on how...
by goitomta
Wed Nov 21, 2012 12:52 pm
Forum: HYDRUS (2D/3D)
Topic: Water fluxes at observation nodes
Replies: 10
Views: 11995

Dear Jirka,

My meshline is horizontal, i.e.vertical to the line of symmetry and at the output I have positive and negative water fluxes. Is downward flux represented by the positive or negative fluxes?

Goitom
by goitomta
Wed Oct 10, 2012 6:47 am
Forum: HYDRUS (2D/3D)
Topic: Water balance-hillslope
Replies: 11
Views: 11171

Thanks Jirka, I have now cumulative seepage loss via the bottom side (5500 mm length of seepage face) and cumulative surface run-off (800000 mm length of the sloped profile) all in mm2. If I need to express the results in mm,is that correct if I divide the cumulative seepage (mm2) by the length of s...
by goitomta
Thu Oct 04, 2012 2:11 pm
Forum: HYDRUS (2D/3D)
Topic: Water balance-hillslope
Replies: 11
Views: 11171

Thanks Jirka, it worked well except that the relative error in water balance was between 1 to 3% depending on the soil type used in the top layer(I was expecting it to be less than 1%).

Goitom
by goitomta
Wed Oct 03, 2012 6:32 am
Forum: HYDRUS (2D/3D)
Topic: Water balance-hillslope
Replies: 11
Views: 11171

Water balance-hillslope

Hi Jirka, Thanks for the quick and thoughtful responses. I am trying to answer if sugar-cane can be grown in a 1.5 m deep loamy sand overlying a 4.5 m deep slimes layer. I set the 800 m long flow domain at an angle of 0.4 degrees with an atmospheric BC on the top soil surface and seepage face at the...
by goitomta
Mon Aug 13, 2012 10:57 am
Forum: HYDRUS (2D/3D)
Topic: Water fluxes at observation nodes
Replies: 10
Views: 11995

Thanks Jirka, I want make sure that I understood you about the surface area of a meshline. If the end point of the meshline is 30 cm away from the line of symmetry (distance from the line of symmetry where x = 0 to the end point of the meshline = 30 cm), I consider the 30 cm as its radius and calcul...
by goitomta
Fri Aug 10, 2012 8:15 am
Forum: HYDRUS (2D/3D)
Topic: Water fluxes at observation nodes
Replies: 10
Views: 11995

Thanks Jirka, Once I run the HYdrus 2D/3D model (2D-axisymetrical vertical flow problem), the fluxes through the meshlines make sense for me and would like to present them in terms of cm/h not cm3/h (for the water flux across the mesh) and cm not cm3 (for the cumulative water flux across the meshlin...
by goitomta
Tue Aug 07, 2012 10:13 am
Forum: HYDRUS (2D/3D)
Topic: Water fluxes at observation nodes
Replies: 10
Views: 11995

Thanks for the quick reply,

What I am thinking for my situation is to use a meshline close to the observation node and estimate the flux that passed the meshline. Can this flux that is registered by the meshline be considered as the flux at the observation node?

Many thanks

Goitom
by goitomta
Tue Aug 07, 2012 7:01 am
Forum: HYDRUS (2D/3D)
Topic: Water fluxes at observation nodes
Replies: 10
Views: 11995

Water fluxes at observation nodes

Dear Jirka,

I am using HYDRUS 2D/3D model (2.xx version) and I am wondering if there is any option where water fluxes at observation nodes can be simulated or computed? I am aware that fluxes at observation nodes can be computed in HYDRUS-1D.

Thanks in Advance

Goitom
by goitomta
Mon Jul 30, 2012 7:42 am
Forum: HYDRUS (2D/3D)
Topic: Irrigation scheduling by terminating irrigation
Replies: 1
Views: 2192

Irrigation scheduling by terminating irrigation

Dear Jirka, one way of scheduling irrigation is by 'triggering irrigation' when a certain tension threshhold value at a given depth is reached and this is available in HYDRUS 2D/3D boundary condition option. I want to 'stop irrigation' when a wetting front of certain strength reaches a certain depth...