GSSHA User's Manual

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Table of Contents

Preface
1 Introduction
1.1 History
1.2 Purpose


2 Model Formulation
2.1     Processes Simulated
2.2     Time Steps and Process Updates
2.3     Inputs


3 Project File
3.1     Required Inputs
3.2     Mapping Table – Optional
3.3     Overland Flow – Required
3.4     Interception – Optional
3.5     Rainfall Input and Options – Required
3.6     Infiltration – Optional
3.7     Channel Routing – Optional
3.8     Continuous Simulations – Optional
3.9     Saturated Groundwater Flow – Optional
3.10     Soil Erosion – Optional
3.11     Constituent Transport – Optional
3.12     Subsurface Drainage Network – Optional
3.13     Output Files – Required


4 General
4.1     Units
4.2     Grid Size
4.3     Total Event Simulation Time
4.4     Coordinate System
4.5     Map Headers
4.6     Watershed Mask
4.7     Elevation Map
4.8     Optimizations


5 Surface Water Routing
5.1     Channel Routing
5.2     Overland Flow Routing
5.3     Channel Boundary Conditions
5.4     Overland Boundary Conditions
5.5     Embankments
5.6     Overland/Channel Interaction
5.7     Introducing Discharge/Constituent Hydrographs
5.8     Overland Routing with Snow


6 Precipitation
6.1     Spatially and Temporally Uniform Precipitation
6.2     Spatially and Temporally Varied Precipitation
6.3     Interpolation Between Gages
6.4     Interception


7 Infiltration
7.1     Richards’ Equation
7.2     Green and Ampt (GA)
7.3     Multi-layer Green and Ampt
7.4     Green and Ampt with Redistribution (GAR)
7.5     Parameter Estimates


8 Groundwater
8.1     General
8.2     Formulation
8.3     Solution
8.4     Assignment of Parameter Values
8.5     Boundary Conditions
8.6     Coupling of the Saturated Zone Model with the Richards’ Equation Model of the Unsaturated Zone
8.7     Coupling of the Saturated Zone Model to the GA Type Infiltration Models


9 Continuous
9.1     Computation of Evaporation and Evapo-transpiration
9.2     Computation of Soil Moisture
9.3     Hydrometeorological Data
9.4     Snowfall Accumulation and Melting
9.5     Sequence of Events During Long-Term Simulations


10 Soil Erosion
10.1     Overland Erosion Formulation
10.2     Channel Sediment Transport Formulation
10.3     Sediment in Lake
10.4     Applicability of the Sediment Routing Methods
10.5     Simulations with Soil Erosion


11 Constituent Transport and Fate
11.1     Simulating Reactive Constituents in GSSHA
11.2     Transport Formulations
11.3     Simple Constituents
11.4     Point and Non-point sources
11.5     Multi-phase transport


12 Mapping Table
12.1     File Description
12.2     Index Maps
12.3     Grid-based Mapping Tables
12.4     ID Line Format
12.5     Example Mapping Table File
12.6     Stream Mapping Tables
12.7     Sediment Erosion Mapping Tables
12.7     Constituent Mapping Tables


13 Additional Inputs
13.1     Spatially and Temporally Varied Precipitation
13.2     Soil Layer Input File
13.3     Static Pumping Wells
13.4     Hydrometeorological Input File


14 Output
14.1     Required Flags and Files
14.2     Run Summary File
14.3     Optional Flags
14.4     Time Series Data at Internal Locations
14.5     WMS Hydrograph File
14.6     Time Series Maps


15 Creating Project Files
15.1     Simple Project File
15.2     Involved Project File
15.3     Continuous Simulation Project File


16 Building a Model
16.1     Delineating the Watershed
16.2     Selecting a Grid Size
16.3     Overland Flow Routing
16.4     Infiltration
16.5     Channel Routing
16.6     Single Event Calibration
16.7     Long-term Simulations
16.8     Saturated Groundwater Modeling
16.9     Calibration and Verification
16.10    Sediment Transport
16.11    Contaminant Transport


17 GSSHA File Formats
17.1     Project File
17.2     Mapping Tables
17.3     Stream Network Files
17.4     GRASS grid files
17.5     Nutrient Files
17.6     Time and Elevation Series Files


18 Alternate Run Modes
18.1     MPI and OpenMP Parallelization
18.2     Simulation Setup for Alternate Run Modes
18.3     Batch Mode Runs
18.4     Automated Calibration with Shuffled Complex Evolution
18.5     Monte Carlo Runs
18.6     ERDC Automated Model Calibration Software
   18.6.1     Efficient Local Search
   18.6.2     Multistart
   18.6.3     Trajectory Repulsion
   18.6.4     Effective and Efficient Stochastic Global Optimization


19 Subsurface Drainage


20 Frozen Soil


21 Conceptual Groundwater
References