scholarly journals Calibrating a High-Performance Hydrodynamic Model for Broad-Scale Flood Simulation: Application to Thames Estuary, London, UK

2016 ◽  
Vol 154 ◽  
pp. 967-974 ◽  
Author(s):  
Asari A. Rashid ◽  
Qiuhua Liang ◽  
Richard J. Dawson ◽  
Luke S. Smith
Keyword(s):  
Hydrodynamic Model ◽  
High Performance ◽  
Flood Simulation ◽  
Thames Estuary ◽  
Broad Scale

scholarly journals A coupled hydrological and hydrodynamic model for flood simulation

2018 ◽  
Vol 50 (2) ◽  
pp. 589-606 ◽  
Author(s):  
Zhanyan Liu ◽  
Hongbin Zhang ◽  
Qiuhua Liang
Keyword(s):  
Hydrodynamic Model ◽  
Coupled Model ◽  
Computational Domain ◽  
Hydrological Models ◽  
Flood Simulation ◽  
Lumped Model ◽  
Topographic Features ◽  
The Individual ◽  
Unit Hydrographs ◽  
Flood Dynamics

Abstract This paper presents a new flood modelling tool developed by coupling a full 2D hydrodynamic model with hydrological models. The coupled model overcomes the main limitations of the individual modelling approaches, i.e. high computational costs associated with the hydrodynamic models and less detailed representation of the underlying physical processes related to the hydrological models. When conducting a simulation using the coupled model, the computational domain (e.g. a catchment) is first divided into hydraulic and hydrological zones. In the hydrological zones that have high ground elevations and relatively homogeneous land cover or topographic features, a conceptual lumped model is applied to obtain runoff/net rainfall, which is then routed by a group of pre-acquired ‘unit hydrographs’ to the zone borders. These translated hydrographs will then be used to drive the full 2D hydrodynamic model to predict flood dynamics at high resolution in the hydraulic zones that are featured with complex topographic settings, including roads, buildings, etc. The new coupled flood model is applied to reproduce a major flood event that occurred in Morpeth, northeast England in September 2008. While producing similar results, the new coupled model is shown to be computationally much more efficient than the full hydrodynamic model.

High performance computing for flood simulation using Telemac based on hybrid MPI/OpenMP parallel programming

2014 ◽  
Vol 05 (04) ◽  
pp. 1472001 ◽  
Author(s):  
Zhi Shang
Keyword(s):  
Parallel Computing ◽  
Parallel Programming ◽  
High Performance ◽  
Large Scale ◽  
Flood Simulation ◽  
Hybrid Programming ◽  
Fine Grain ◽  
Domain Partitioning ◽  
Performance Computing ◽  
Parallel Technique

Usually simulations on environment flood issues will face the scalability problem of large scale parallel computing. The plain parallel technique based on pure MPI is difficult to have a good scalability due to the large number of domain partitioning. Therefore, the hybrid programming using MPI and OpenMP is introduced to deal with the issue of scalability. This kind of parallel technique can give a full play to the strengths of MPI and OpenMP. During the parallel computing, OpenMP is employed by its efficient fine grain parallel computing and MPI is used to perform the coarse grain parallel domain partitioning for data communications. Through the tests, the hybrid MPI/OpenMP parallel programming was used to renovate the finite element solvers in the BIEF library of Telemac. It was found that the hybrid programming is able to provide helps for Telemac to deal with the scalability issue.

A Novel Two-Way Coupled Model for Simulating the Interaction between Fluid flow and Floating Debris

2020 ◽  
Author(s):  
Yan Xiong ◽  
Qiuhua Liang ◽  
Gang Wang ◽  
Yunsong Cui
Keyword(s):  
Fluid Flow ◽  
Water Depth ◽  
Hydrodynamic Model ◽  
High Performance ◽  
Large Scale ◽  
Coupled Model ◽  
Storm Surges ◽  
Floating Objects ◽  
The Impact ◽  
Dem Model

<p>Extreme natural hazards such as tsunamis or storm surges have been frequently reported in recent years, posting serious threat to people and their properties. Numerical modelling has provided an indispensable tool to predict these hazardous events and assess their risks. However, most of the current models are based on the assumption of “clean” water and neglect the impact of floating debris as observed in reality. The interactive processes between the floating debris and the background fluid flow have not been well explored and understood. Few reliable modelling tool has been reported for simulating and predicting these complicated processes.</p><p>This work presents a two-way dynamic method to couple a 2D shallow flow hydrodynamic model with a discrete element method (DEM) model for simulating and analyzing the interactive process between fluid flow and floating debris under the extreme hydraulic conditions induced by tsunami or flash flooding. The proposed two-way coupling approach uses the high-resolution water depth and velocity predicted by the hydrodynamic model to quantify the hydrostatic and dynamic forces acting on the floating objects; the corresponding counter forces on the fluid are subsequently taken into account by including extra source terms in the governing shallow water equations (SWEs) of hydrodynamic model. This new approach lifts the limitation of traditional approaches that reply on calibrated empirical parameters to quantify the forces. In developing the resulting coupled model, a multi-sphere method (MSM) is adopted and implemented in the DEM model to simulate solid debris. This method ensures that the interaction of fluid and solid is realistically modelled and the application is not restricted by shapes and sizes of debris.</p><p>The new coupling model is validated against a dam-break flume experiment with three floating objects impacting two fixed obstacles. The predicted results in terms of water depth and floating object displacements in both horizontal and vertical directions compare well with the experimental observations. Furthermore, the new coupled model is computationally accelerated by implementation on modern GPUs to achieve high-performance computing. It provides a robust and innovative modelling tool for the simulation of large-scale flooding process including debris impact and assess the resulting risk.</p><p></p><p></p><p></p>

Hydrologic models coupled with 2D hydrodynamic model for high-resolution urban flood simulation

2021 ◽  
Author(s):  
Mayara Maria de Arruda Gomes ◽  
Lívia Fragoso de Melo Verçosa ◽  
José Almir Cirilo
Keyword(s):  
High Resolution ◽  
Hydrodynamic Model ◽  
Hydrologic Models ◽  
Flood Simulation ◽  
Urban Flood

scholarly journals A Search Space Exploration Framework for e-Science Applications

2018 ◽  
Author(s):  
Eric B. Gauch ◽  
Bruno E. C. Milanesi ◽  
Bruno Silva ◽  
Renato L. F. Cunha ◽  
Marco A. S. Netto
Keyword(s):  
High Performance Computing ◽  
High Performance ◽  
Space Exploration ◽  
Search Space ◽  
Black Box ◽  
Flood Simulation ◽  
Search Spaces ◽  
Scientific Experiments ◽  
Oil Gas ◽  
Performance Computing

High Performance Computing (HPC) has always been a fundamental component to conduct scientific experiments. Model calibrations/simulations often require several executions of scientific applications by changing their input parameters. This process is a common practice in research even though it represents a tedious and error-prone task. In this paper we propose Copper framework which employs a black-box strategy and contains a set of plugins to accelerate user experiments for exploring search spaces in HPC parametric applications. Copper has been used to conduct scientific experiments in different areas including, agriculture, oil gas, flood simulation, and bioinformatics.

scholarly journals An Operational High-Performance Forecasting System for City-Scale Pluvial Flash Floods in the Southwestern Plain Areas of Taiwan

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 405
Author(s):  
Tzu-Yin Chang ◽  
Hongey Chen ◽  
Huei-Shuin Fu ◽  
Wei-Bo Chen ◽  
Yi-Chiang Yu ◽  
...  
Keyword(s):  
Hydrodynamic Model ◽  
High Performance ◽  
Flash Flood ◽  
Wrf Model ◽  
Flash Floods ◽  
Soil Conditions ◽  
Two Dimensional ◽  
Weather System ◽  
Forecasting System ◽  
Performance Forecasting

A pluvial flash flood is rapid flooding induced by intense rainfall associated with a severe weather system, such as thunderstorms or typhoons. Additionally, topography, ground cover, and soil conditions also account for the occurrence of pluvial flash floods. Pluvial flash floods are among the most devastating natural disasters that occur in Taiwan, and these floods always /occur within a few minutes or hours of excessive rainfall. Pluvial flash floods usually threaten large plain areas with high population densities; therefore, there is a great need to implement an operational high-performance forecasting system for pluvial flash flood mitigation and evacuation decisions. This study developed a high-performance two-dimensional hydrodynamic model based on the finite-element method and unstructured grids. The operational high-performance forecasting system is composed of the Weather Research and Forecasting (WRF) model, the Storm Water Management Model (SWMM), a two-dimensional hydrodynamic model, and a map-oriented visualization tool. The forecasting system employs digital elevation data with a 1-m resolution to simulate city-scale pluvial flash floods. The extent of flooding during historical inundation events derived from the forecasting system agrees well with the surveyed data for plain areas in southwestern Taiwan. The entire process of the operational high-performance forecasting system prediction of pluvial flash floods in the subsequent 24 h is accomplished within 8–10 min, and forecasts are updated every six hours.

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