Models

Distributed GIS Based Soil Water Balance Model

A GIS based daily soil water balance model was developed to simulate daily soil water content in the root zone (SWC). The model continuously simulates spatial distribution of each water balance component such as evapotranspiration, runoff and precipitation and irrigation on a daily time step. The entire model was implemented in ArcGIS using Visual Basic Applications and ArcObjects.

Mapping EvapoTranspiration

Application of METRIC - Mapping EvapoTranspiration at high Resolution with Internalized Calibration) that uses Landsat satellite data to compute and map evapotranspiration (ET) for managing Nebraska state water resources.

LSM-EnKF

The EnKF is a sophisticated sequental data assimilation method. It applies an ensemble of model states to represent the error statistics of the model estimate, it applies ensemble integrations to predict the error statistics forward in time, and it uses an analysis scheme which operates directly on the ensemble of model states when observations are assimilated. The EnKF has proven to efficiently handle strongly nonlinear dynamics and large state spaces and is now used in realistic applications with primitive equation models for the ocean and atmosphere.

Genetic Algorithm

A genetic algorithm (GA) is a search technique used in computing to find exact or approximate solutions to optimize hydraulic resources in Nebraska.