Transcript Applied Hydrology Rainfall Analysis - RSLAB-NTU

Applied Hydrology
Hydrological Analysis and Simulation Model
HEC-HMS
Prof. Ke-Sheng Cheng
Department of Bioenvironmental Systems Engineering
National Taiwan University
Introduction
• Hydrological analysis and simulation generally
involve many components including
precipitation, infiltration, rainfall-runoff
transformation, reservoir routing, channel
routing, design of water conveyance or
detention structures, etc.
– Hydrological and hydraulic analyses (H&H analyses)
• Computer models capable of handling all these
tasks in one run are very helpful in engineering
design and assessment of possible alternatives.
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Dept. of Bioenvironmental Systems Eng., NTU
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• Many hydrological models have been
developed.
– HEC-HMS, HEC-RAS
– SWMM
– HSPF
– SOBEK
– MIKE
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HEC-HMS
• Developed and distributed by the US Army
Corps of Engineering.
• Free download is available.
• HMS is a project-based hydrologic modeling
system. A project is composed of several
components
– Basin model component
– Meteorological model component
– Control specifications component
– Input data component
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Lab for Remote Sensing Hydrology and Spatial Modeling,
Dept. of Bioenvironmental Systems Eng., NTU
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User Interface
Watershed Explorer
Desktop
Component Editor
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Message Log
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HMS model components
• A simulation run calculates the rainfall-runoff
response in the basin model given rainfall input
from the meteorological model.
• The control specifications component define
the time period and time step of the simulation
run.
• The input data component provides auxiliary
data that are required for the simulation run
including
– Time series of hyetograph
– Stage-storage-discharge relationship
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Basin model component
• Basin model component defines hydrological
elements that form the watershed drainage
network and types of hydrological analysis that
need to be conducted in a simulation run.
• Hydrological elements
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Subbasin
Reach
Junction
Reservoir
Diversion
Sink
Source
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Starting HEC-HMS
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• Create a new project or open an existing project
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The same watershed can be
Create a Basin Model
modeled by different Basin models
to assess the effect of different
hydrological modeling approaches.
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Adding hydrological elements to Basin 1.
A subbasin cannot be connected to downstream point
without a downstream element (junction or reach).
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Create a meteorological model
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Create Control Specifications
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Create and compute a simulation run
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Check simulation results
Culverts diameter=1m
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Culverts diameter=3m
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Whippany Landfill Closure Plan
Drainage design
Pre-development
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Pre-development
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Post-development
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Post-development
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Lab for Remote Sensing Hydrology and Spatial Modeling,
Dept. of Bioenvironmental Systems Eng., NTU
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• Practical drainage design necessitates detailed
hydrological modeling and simulation.
– Sizing the drop flume
– Designing the peripheral ditch
– Grading and storage routing in front of the entrance
to drop flumes
– Hydraulic jump calculation at the D/S end of drop
flumes (side protection for the peripheral ditch)
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Lab for Remote Sensing Hydrology and Spatial Modeling,
Dept. of Bioenvironmental Systems Eng., NTU
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