Comparison of Hydraulic Modeling Tools: A Case Study For

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