HMS Preliminary March 24 2014 Rosa Aguilar Computational Hydraulics and Hydrology wwwmahometaquiferconsortiumorg Surface Runoff Water flow that occurs when the soil is infiltrated to full capacity and excess water from rain ID: 357670
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Slide1
Comparison of overland flow diffusion wave model with SWMM and HEC-HMS(Preliminary)
March 24, 2014
Rosa Aguilar
Computational Hydraulics and HydrologySlide2
www.mahometaquiferconsortium.org
Surface Runoff
Water flow that occurs when the soil is infiltrated to full capacity and excess water from rain,
meltwater, or other sources flows over the land (wikipedia).Slide3
ModelingWatershed
runoff must be predicted to provide the
information for certain activities:
Increased volume of runoff for proposed changes to land use in a watershed.
A
model relates something unknown (the output) to something known (
the input
). Slide4
Modeling SystemsHydrologic Modeling System (HEC-HMS)2013
EPA’s Storm Water Management Model (SWMM)
2011
Overland flow diffusion wave model
2013Slide5
HEC-HMSUS Army Corps of Engineers
Four versions since HEC-1
Version 1:
Graphical user interface.Version 2: Continuous simulation.Version 3:
New computational features and graphical user interface.
Snowmelt, evapotranspiration, infiltration, data management, increase user efficiency.
Version 4:
New
c
omputation features.
Surface erosion and channel sediment transport
Nutrient water quality simulationSlide6
HEC-HMSKinematic wave
Lag
Modified
PuIsMuskingumMuskingum-
Cunge
Standard Section
Muskingum-
Cunge
8-point Section
Confluence
Bifurcation
Routing ModelsSlide7
EPA SWMMRouting
models
Steady flow
Kinematic waveDynamic waveSlide8
EPA SWMMSteady Flow:
Instantaneous
translation of a hydrograph
with no time delay or change in shape due to conduit storage. Kinematic Wave: E
fficient but simplified approach that cannot deal with backwater effects, pressurized flow, flow reversal, and non-dendritic layouts.
N
umerical
stability
attained with
moderately large time steps, on the order of 5 to 15 minutes
Dynamic Wave:
C
an
represent these conditions. However, the procedure requires more computation time, due to the need for
smaller time steps
to maintain
numerical stability.Slide9
Overland flow diffusion wave model
Simulates
catchment dynamics using the diffusion wave model developed by Ponce (1986). The program is a numerical model of overland flow using an open-book schematization. Slide10
Outflow hydrograph does not vary with the choice of grid size.Physical
diffusivity of
Hayami
:
Numerical
diffusivity of
Cunge
:
Cell Reynolds number:
Overland flow diffusion wave modelSlide11
Overland flow diffusion wave modelDiffusion wave with dynamic components
Dynamic
hydraulic
diffusivity:Numerical dispersion is minimized by setting the Courant number C
equal to 1:Slide12
Fig. 1 Effect of grid resolution on the outflow hydrograph, 12
-hr rainfall duration, 2 cm/
hr
rainfall intensity, 18-ha watershed area. Slide13
Further StudiesRun HEC
-HMS and
SWMM.
Run the runoff simulation models with the data used in Overland flow of diffusion wave model.Compare the results. Slide14
ReferencesPonce, V.M., 1986.
Diffusion Wave Modeling of Catchment Dynamics
Journal of Hydraulic Engineering, 112(8). pp. 716-727
.Wikipedia. (2014, March 23). Surface Water.
Retrieved from
http
://
en.wikipedia.org
/wiki/
Surface_water
Mahomet
Aquifer
Consortium. (2014, March 23).
MAC Educational Materials/ 2: Hydrologic
Cycle.
Retrieved
from http://
www.mahometaquiferconsortium.org
/