Search found 46 matches

by IJsbrand
Mon Jul 04, 2011 6:54 pm
Forum: HYDRUS (2D/3D)
Topic: Change Soil Density within same material
Replies: 6
Views: 2414

Hi,

maybe you can make two type of soils (1 and 2) and vary only the permeablitity between the two. The porosity should be the only diffrence between them. This is the main thing that shances by compaction
by IJsbrand
Mon Jun 27, 2011 10:49 am
Forum: HYDRUS (2D/3D)
Topic: Porosity?
Replies: 2
Views: 1792

Hi Jirka and Ode,

Does changing teh porosity not also effects the MvG parameters? (an input parameter?)

greetz
by IJsbrand
Mon Jun 27, 2011 10:44 am
Forum: HYDRUS (2D/3D)
Topic: Sensitivity analysis
Replies: 3
Views: 2315

Hi Ode, There is also a programme called PEST. It was used for SWAP a dos [xx(]predecessor of Hydrus 2d. It's lets you make a large number of simulations with small adjustment.. Something like that. You have to look on te WWW . I found something: Sensitivity Analysis of SWAT Using SENSAN I also foun...
by IJsbrand
Wed May 21, 2008 6:43 am
Forum: HYDRUS (2D/3D)
Topic: PAH transport with HYDRUS-2D
Replies: 3
Views: 2909

Viet, I have found the same pollutants on a gas factory site. The PAH's (tar) were dumped in a Tar pit which has leached out (still found on 8 meters below grondwatertable level). The major problem is that PAH's are a cocktail of different elements with all different transfer and sorption rates..For...
by IJsbrand
Mon Mar 03, 2008 7:52 pm
Forum: HYDRUS (2D/3D)
Topic: V-G parameters
Replies: 4
Views: 3415

Hi Boy, I would't be affended If you could give your real name. But nethertheless, I Have found some data of a calcic layer: Theta r = 0.00 theta s = 0.45 K s = 24 alpha = 0.0026 m = 0.08 n = 1.569 l = 2.5 alpha w = 0.0026 The results were obtained with a Guelph permeameter and field data in Tomello...
by IJsbrand
Thu Feb 21, 2008 9:06 pm
Forum: HYDRUS (2D/3D)
Topic: V-G parameters
Replies: 4
Views: 3415

BoyC I think that the amount of weathering of the limestone is the basis. The loose materiaal will have the major flows and not the limestone itself. I think that there could be 100 times (order 3) flow differences. You have to knwo your sol better before you can simulate it (with 2 materials e.g. l...
by IJsbrand
Tue Jan 22, 2008 2:40 pm
Forum: HYDRUS (2D/3D)
Topic: diffrence between models
Replies: 2
Views: 2269

Thanks Jirka, I will incorporate it maybe in my dissertation, if there is a signific difference. But about the intraparticular flow, I can still put a pf curve ( a strange one with intraparticular flow incorperated) as a table in the orginal hydrus-2d?. I know I ask a lot of the good ol'model, but t...
by IJsbrand
Tue Jan 15, 2008 9:31 pm
Forum: HYDRUS (2D/3D)
Topic: diffrence between models
Replies: 2
Views: 2269

diffrence between models

Hi Jirka or other developers, I have a question I read an article that there was model of Hydrus-2d developed which was capable of simulating overland flow. It was for modeling Water flow Patters in Flexible Pavements. From Hansson, Lundin en Simunek. It was concluded that the main problem were the ...
by IJsbrand
Tue Mar 14, 2006 7:17 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: Simulation for road pavement and filter drain
Replies: 5
Views: 4710

Hi Jirka, I was wondering did you incorporate the overland flow? And if you did, how did you deal with the accumulation of the water en the delayed runoff? I used a arbitrary non- excisting layer of air to facilitate this. (Yes I am lazy so I would not have to calculate this myself ;-). ) The simula...
by IJsbrand
Fri Mar 10, 2006 7:48 pm
Forum: HYDRUS (2D/3D)
Topic: downloading Hydrus-3d
Replies: 1
Views: 2430

downloading Hydrus-3d

Hi Jirka,

I have tried to download Hydrus-3d but got a error while sending the data of the filled in Form.
Do you know why?
And what are the minimum requirements ro run the software (windows '98?)
regards,

IJsbrand de Haan
by IJsbrand
Sun May 23, 2004 3:42 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: Large Precipitation
Replies: 6
Views: 3588

dear sofia, This topic was listed before. But that does't matter. I had the same problem a midsummer thunderstorm gives the same results. You can do something that is no the truth but can overcome your problem You can smoothen the rainfall over a few days but keep the amount of precipitation the sam...
by IJsbrand
Sat May 01, 2004 7:21 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: Water Flow Parameters
Replies: 8
Views: 5067

hi all

I would also be very interested in MEASURED water retention data of boulders or cobbles

Thanks IJsbrand
by IJsbrand
Sun Apr 25, 2004 8:09 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: Water Flow Parameters
Replies: 8
Views: 5067

hello Sandy, I also did a lot of measurements on Slags (MSWI), concrete aggregates and masonry agrregates( all secondary building materials). If the material you are meantioning is not seaved I foud that the smaller parts were controling the flow. Furthermore there is a problem of a substantional in...
by IJsbrand
Sun Mar 14, 2004 6:15 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: error message
Replies: 6
Views: 5465

Dear all (maybe specific Jirka), Does anyone know if it is possible to copy a list of all simulations and the description of the simulations. It is nicely listed in the project manager [thanks codecrackers]. But I wanted to tell the world what simulations I did and I retyped a part of them manually ...
by IJsbrand
Sun Mar 14, 2004 6:14 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: listing of simulations
Replies: 1
Views: 2171

listing of simulations

<font size=4></font id=size4> Dear all (maybe specific Jirka), Does anyone know if it is possible to copy a list of all simulations and the description of the simulations. It is nicely listed in the project manager [thanks codecrackers]. But I wanted to tell the world what simulations I did and I re...