Ecohydrologic modeling

Check out the slideshow of 5 items below:

  • Slide Title: Spatially distributed LAI
  • Slide Title: Simulated vs observed soil moisture
  • Slide Title: Simulated vs observed soil temperature
  • Slide Title: Simulated vs observed GPP
  • Slide Title: Simulated vs observed ground heat and sensible heat

ECH2O is a spatially-distributed, physically-based model for ecohydrologic studies. It couples together a description of the energy balance with a hydrologic model and a forest growth components. ECH2O has the following features:

  • Two-layer energy balance (canopy and understory) to solve transfers in the soil-plant-atmosphere column using a 1D first-order, local-closure description of energy fluxes. 
  • Green and Ampt simplification of Richards equation to simulate infiltration into the soil. 
  • 1D kinematic description of lateral water transfers in channels and subsurface.
  • Forest production and carbon allocation schemes adapted from the 3PG model.
  • Allometric relationships based on the TREEDYN model. 
  • Model fully written in C++ and multithreaded to take advantage of multicore computer architectures.
  • Data pre and post processing, and visualization of results using the free GIS PCRASTER 

ECH2O-SPAC (Soil Plant Atmosphere Continuum)

This branch of Ech2o extends the original version of ech2o to incorporate the mechanical energy balance within the hydraulic column of vegetation to track variations in leaf water potential and loss of plant-level conductivity due to xylem cavitation. 

This branch of the code is used to investigate drought-induced tree mortality and plant hydraulic stresses at the lanscape level. Results obtained using this code were presented at AGU2017. 

ECH2O-ISO (Water isotope and age tracking)

This is a fork of Ech2o, initially developed by Dr. Sylvain Kuppel at the Institut de Recherche pour le Développement (IRD) in Toulouse, France, and currently hosted by the Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) in Berlin. This development was part of the VeWa project led by Prof. Doerthe Tetzlaff and Prof. Chris Soulsby at the University of Aberdeen and IGB in collaboration with Prof. Marco Maneta at the University of Montana.

Main features of this fork include: 

  • tracking water isotopic tracers (2H and 18O) and age
  • Immediate, full mixing of tracers across the difference compartments
  • Isotopic fractionation from soil evaporation (Craig-Gordon model)
  • Model currently under evaluation (Kuppel et al., in review)