Software

• Software developed at the department of hydrology
• Used software

Software developed at the department of hydrology:

• DIT - Deficit Irrigation Toolbox
• [DIFGA2000]
• [RIAN]
• [TERRAFORMING]
• [TEXAS2D]

DIFGA2000

Authors: R. Schwarze, M. Gut, W. Dröge (Dresden University of Technology)
Further information about DIFGA can be found here.
Demo version and/or for placing an order: Robert Schwarze
Publications for DIFGA-method: Dr. R.Schwarze

RIAN

Authors: W. Dröge, H. Puhlmann
Description: The software RIAN was developed within the DfG-research project "Estimation of soil hydraulic parameters with hydrodynamic numerical methods and artifical neural networks". RIAN is a versatile applicable tool for modelling dynamic lab experiments with the aim of estimating soil hydraulic parameters. The software's core is the solution of 1D-Richards equation. The main domains for application are:

• Direct modelling of lab experiments
• Inverse estimation of soil hydraulic parameters out of measured experimental data by Annealing-Simplex method.
• With the back-up of further components it is possible to develop artificial neural networks. These make the inverse estimation of soil hydraulic parameters possible without numeric effort.

Further information you find here.

TERRAFORMING

Authors: M. Günther, J. Cullmann
Description: The impact of a rainfall event on the hydrograph of the specific watershed is affected by such factors as antecedent precipitation, the size of the drainage basin, the topography of the basin, urban usage within the basin, etc.. In order to test models thoroughly with respect to their representation of basin characteristic topographic features TERRAFORMING was developed at the Institute of Hydrology and Meteorology. TERRAFORMING is a grid based generator for the synthesis of digital elevation models. The DEMs (digital elevation model) created with TERRAFORMING are defined by the parameters basin outlet and hypsometric curve. These base parameters are then fed to a random walk procedure which fills either the randomly defined or given DEM space with heights according to boundary conditions like minimal height or form of the basin. In a second step, it is possible to analyse the effects of random topology on the result of modelling studies. TERRAFORMING makes use of the DYNIA methodology presented by Wagener & al (2003) to evaluate model results obtained with the generated DEMs. Within TERRAFORMING it is also possible to load external DEMs to extract topographic information. In the automatic mode, an arbitrary number of DEMs are generated. WaSiM-ETH is then executed within a batch script to simulate the rainfall runoff process for each DEM in the current version. Any other model can be used instead of WaSiM-ETH with TERRAFORMING and DYNIA.

Download: TERRAFORMING release (2 MB)
Publications: A. Philip, "Untersuchung des Einflusses morphologischer Gebietscharacteristika auf den NA-Prozess". Diplomarbeit, Dresden, 2005

TEXAS2D

Authors: G.H. Schmitz, A. Müller, A. Fröhner (TU Dresden), J. Edenhofer, J. Weber (TU München)
Description TEXAS2D (Tool for EXact Analytic Solution of 2D Unconfined Groundwater Flow Problems): TEXAS-2D allows both the calculation of stationary ground water surfaces as a consequence of surface leakage / draft or inner sources / sinks (direct calculation) and the estimation of interchange water by a given ground water surface (inverse calculation). In both cases pressure distribution and streamlines in the aquifer are calculated. Because the solution strategy does not use either Dupuit assumption nor another form of linearisation, TEXAS-2D is suitable for applications in relation to local phenomena with steep gradients of the ground water surface like ground water summits or river-groundwater-interaction.
TEXAS2D Web-Site for Download and further informations.
Publications:

• for the calculation of ground water surface:
  G.H. Schmitz and J. Edenhofer, "Exact closed-form solution of the two-dimensional Laplace equation for steady groundwater flow with nonlinearized free-surface boundary condition" WATER RESOURCES RESEARCH, Vol. 36, Nr. 7, Pages 1975-1980, July 2000
• for the calculation of pressure distribution in the aquifer (and at ground water surface):
  J. Edenhofer and G.H. Schmitz, "Pressure Distribution in a Semi-Infinite Horizontal Aquifer with Steep Gradients Due to Steady Recharge and/or Drainage: The Exact Explicit Solution". TRANSPORT IN POROUS MEDIA , Vol. 45, Pages 347-366, 2001

Used Software (extracted list)