By Using Hydraulic Modeling Software HEC-RAS and ISIS
University of Glasgow, charity number SC004401
Zihao Chen
Supervised by
Dr. Manousos Valyrakis
Comparison of Hydraulic Modeling Tools: A Case Study For Dumfries
Introduction
Objectives
Simulation!!Flooding disaster has been linked as a result of worldwide global warming and the population boom.
Hydraulic modeling plays an important role to assist engineers and authorities to design the suitable structures and make resilient plans.
Among 1D modeling methodologies, HEC-RAS which is a non-commercial application has been widely used. At the same time, hydraulic modelers believe that ISIS has a bright prospect in flood modeling field (Néelz & Pender, 2009).
‣ Geometric Data
!!Data Preparation
Flow Pattern: Steady Flow.
Change flow data to obtain water depths on different return periods.
!!Build hydraulic modeling in HEC-RAS and ISIS on the basis of practical hydraulic data of Whitesands at Dumfries.
Compare the differences in progress and results between the two software.
Determine the scopes of application.
Flow
Rat
e (m
3/s)
0
325
650
975
1300
Return Period(yrs)
2 100 200
1,2461,093
487
Methodology
!Table 2 - Flow Levels of S12
Discussion
! Figure 1 - Cross Sections
Figure 2 - Obstructions
!‣ Flow Data
Flow
Dep
th(m
AD
)
0
3.25
6.5
9.75
13
1 In 2 Yrs 1 In 100 Yrs 1 In 200 Yrs
HEC-RAS ISIS
Table 1 - Flow Rates
User Experience
Model Set Up
‣Software Interface
‣Data Input
‣Technical Support
‣Modeling Accuracy
‣Functionality
! Figure 3 - Interface
Figure 4 - Flow Depths of S12 on a 2-Year Return Period
ConclusionISIS
‣High-fidelity
‣User-friendly
‣Muti-functional
HEC-RAS
‣Entry-level
‣Accessible
‣Low-workload
Recommendation
Error Targeting
Flexible Editing
Built-in Topographical Database
Visible Result Output
References
Menzies, I. (2013). River Nith Cross Section. SEPA Update Report. Dumfries: Dumfries and Galloway Council.
Moodie, S., & McGregor, L. (2007). Whitesands Flood Risk Appraisal. Dumfries: Jacobs Engineering.
Néelz, S., & Pender, G. (2009). Desktop review of 2D hydraulic modelling packages. Bristol: Environment Agency.
Soley, M (2014), 'Flood Risk Management and sustainable development of urbanized estuarine areas: a case study for Whitesands at Dumfries', M.S. thesis, University of Glasgow,Glasgow.
‣ Relevant data was obtained from flooding analysis of Dumfries made by Jacob’s Engineering (Moodie & McGregor, 2007), Dumfries and Galloway Council (Menzies, 2013) and Mark Soley(Soley, 2014).
2103231C
MSc Project Poster 2014