Posts tagged hydrology
mHM - mesoscale Hydrologic Model
- 12 December 2024
The mesoscale Hydrologic Model (mHM) developed by the Dept. Computational Hydrosystems at UFZ is a spatially explicit distributed hydrologic model. It is implemented in the Fortran programming language and can be easily installed as software using the conda package manager. The model concept uses grid cells as a primary hydrologic unit, and accounts for the following processes: canopy interception, snow accumulation and melting, soil moisture dynamics, infiltration and surface runoff, evapotranspiration, subsurface storage and discharge generation, deep percolation and baseflow and discharge attenuation and flood routing. The model is driven by hourly or daily meteorological forcings (e.g., precipitation, temperature), and it utilizes observable basin physical characteristics (e.g., soil textural, vegetation, and geological properties) to infer the spatial variability of the required parameters.
ParFlow - Parallel Watershed Flow Model
- 12 December 2024
ParFlow is a parallel, integrated hydrology model that simulates spatially distributed surface and subsurface flow, as well as land surface processes including evapotranspiration and snow. It solves saturated and variably saturated flow in three dimensions using either an orthogonal or terrain-following, semi-structured mesh that enables fine vertical resolution near the land surface and deep (~1 km) confined and unconfined aquifers. ParFlow models dynamic surface and subsurface flow solving the simplified shallow water equations implicitly coupled to Richards’ equation; this allows for dynamic two-way groundwater surface water interactions and intermittency in streamflow. The model uses robust linear and nonlinear solution techniques and exhibits efficient parallel scaling to large processor counts, more than 100K cores, enabling very large extent simulations with fine spatial resolution. ParFlow has been coupled to various land surface and atmospheric models such as CLM, WRF, and TerrSysMP.
WaterGAP (Water Global Assessment and Prognosis)
- 06 June 2024
WaterGAP is a global hydrological model that quantifies human use of groundwater and surface water as well as water flows and water storage and thus water re- sources on all land areas of the Earth. Since 1996, it has served to assess water resources and water stress both historically and in the future. It has been used in multiple studies on climate change impacts and drought and includes an advanced estimation of groundwater recharge. WaterGAP simulations regularly contribute to ISIMIP simulation rounds.
COSIPY - COupled Snowpack and Ice surface energy and mass balance model in PYthon (COSIPY)
- 21 May 2024
COSIPY is a flexible and user friendly coupled snowpack and ice surface energy and mass balance model written in Python. COSIPY is based on COSIMA, a ‘COupled Snowpack and Ice surface energy and MAss balance model’, translating the code into Python, and developing further the initial concepts. It combines a surface energy balance (SEB) with a multi-layer subsurface snow and ice model to compute the glacier mass balance (MB). The calculated surface melt water serves as input for the subsurface model. The two models are directly coupled in order to account for melt water percolation, retention and refreezing within the snow pack under consideration of latent heat release and resulting subsurface melt as well as the effects on subsurface temperature, snow density and ground heat flux. All subsurface processes are resolved in a vertical layer structure. COSIPY consists of several modules for solving the heat equation, calculating percolation and refreezing and calculating densification. The modular model setup allows replacing single parameterizations.
HD Model (Hydrological Discharge Model)
- 16 May 2024
The Hydrological Discharge (HD) model calculates the lateral transport of water over the land surface to simulate discharge into the oceans. It has been validated and applied in many studies since the publication of its original global 0.5° version (Hagemann and Dümenil 1998; Hagemann and Dümenil Gates 2001). Hagemann et al. 2020 developed a high-resolution version that can be applied globally at a 5 Min. (~8-9 km) resolution. This HD version was applied and validated over Europe. The HD model has been coupled to several global and regional Earth System Models. It separates the lateral water flow into the three flow processes of overland flow, baseflow, and riverflow. Overland flow and baseflow represent the fast and slow lateral flow processes within a grid box, while riverflow represents the lateral flow between grid boxes. The HD model requires gridded fields of surface and subsurface runoff as input for overland flow and baseflow, respectively, with a temporal resolution of one day or higher.
Optional components
- 18 July 2023
The following table lists, in alphabetical order, all models that have been presented by the corresponding institutions during past natESM events.
The fact that we have listed the models here does not imply that the models or parts of them will be part of the future natESM system.