digital terrain model Articles
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Effects of model schematisation, geometry and parameter values on urban flood modelling
One-dimensional (1D) hydrodynamic models have been used as a standard industry practice for urban flood modelling work for many years. More recently, however, model formulations have included a 1D representation of the main channels and a 2D representation of the floodplains. Since the physical process of describing exchanges of flows with the floodplains can be represented in different ways, the ...
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A methodology for processing raw LiDAR data to support urban flood modelling framework
An assessment has been carried out to study the performance of seven different LiDAR filtering algorithms and to evaluate their suitability for urban flood modelling applications. It was found that none of these algorithms can be regarded as fully suitable to support such work in its present form. The paper presents the augmentation of an existing Progressive Morphological filtering algorithm for ...
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Analysis of extreme flooding events through a calibrated 1D/2D coupled model: the case of Barcelona (Spain)
This paper presents the results of a calibrated 1D/2D coupled model simulating surface and sewer flows in Barcelona. The model covers 44 km2 of the city land involving 241 km of sewers. It was developed in order to assess the flood hazard in the Raval district, historically affected by flooding during heavy rainfalls. Special attention was paid to the hydraulic characterization of the inlet ...
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Different approaches for modelling of sewer caused urban flooding
The correct prediction of flooding in urban areas is an important challenge to secure the values and fulfil public regulations. Traditional sewer simulations deliver the basic information for a rudimental flood protection, but the interaction between sewer and surface runoff can only be considered by a bi-directional modelling. Therefore detailed information about the relevant structures on the ...
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Different approaches for modelling of sewer caused urban flooding
The correct prediction of flooding in urban areas is an important challenge to secure the values and fulfil public regulations. Traditional sewer simulations deliver the basic information for a rudimental flood protection, but the interaction between sewer and surface runoff can only be considered by a bi-directional modelling. Therefore detailed information about the relevant structures on the ...
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Ditch network extraction and hydrogeomorphological characterization using LiDAR-derived DTM in wetlands
While much emphasis has been placed on the importance of hydrology as a driving force for wetlands, few small stream drainage networks have been mapped. Light Detection and Ranging (LiDAR) data can provide very high-precision topographic maps over large areas, and have been used to extract drainage networks in forested areas, vineyards, and high mountain pastures. The study objective is to ...
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Modeling streamflow from coupled airborne laser scanning and acoustic Doppler current profiler data
The rating curve enables the translation of water depth into stream discharge through a reference cross-section. This study investigates coupling national scale airborne laser scanning (ALS) and acoustic Doppler current profiler (ADCP) bathymetric survey data for generating stream rating curves. A digital terrain model was defined from these data and applied in a physically based 1-D ...
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Development of a screening method to assess flood risk on Danish national roads and highway systems
A method to assess flood risk on Danish national roads in a large area in the middle and southern part of Jutland, Denmark, was developed for the Danish Road Directorate. Flood risk has gained renewed focus due to the climate changes in recent years and extreme rain events are expected to become more frequent in the future. The assessment was primarily based on a digital terrain model (DTM) ...
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Generating meshes for tidal wetland modeling using light detection and ranging (LiDAR) data
A high resolution model mesh was required to numerically simulate sediment transport in tidal marshes. The timing of flooding is dependent on the tidal marsh ground elevation, which requires accurate topographic elevation data. The tidal prism of the marsh is determined by the volume provided by tidal channels in the system. Hence, their location and bathymetry needed to be represented ...
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Time-lapse photography for monitoring reservoir leakages (Montejaque dam, Andalusia, southern Spain)
A methodology based on the use of time-lapse photographs is presented to evaluate the leakages over time of a reservoir (Montejaque dam, Málaga Province, Spain) that feeds a karstic aquifer. In particular, photographic control allows the evolution of water levels in the dam and the river that feeds it to be monitored. Through changes in water volume, which are calculated from the level ...
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A GIS-supported 3D approach for flood risk assessment of the Qu'Appelle River, Southern Saskatchewan
This research introduces a hybrid approach for flood risk assessment through GIS. The developed approach is based on the integration of hydraulic simulation and GIS analysis, which allows spatial-based visualisation and prediction of flood disaster. In particular, the Hydraulic Engineering Center River Analysis System (HEC-RAS) model is employed to simulate multi-scenario flood cases within a ...
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Birmingham, AL I-59/I-20 Corridor Project - Birmingham, Alabama, United States - Case Study
Project Summary Project Located in the Birmingham Business District, the I-59/I-20 interchange is Alabama’s busiest corridor, with vehicular demand almost tripling since it was originally built in the 1960s. To improve functionality and capacity of the structurally deficient interchange, Alabama Department of Transportation (ALDOT) initiated a USD 750 million reconstruction project that ...
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Evolution of an integrated 1D/2D modeling package for urban drainage - Case Study
Introduction: Recent flooding events in North America have revealed deficiencies in existing stormwater infrastructure and management practices. The development of effective and efficient designs requires a comprehensive understanding of flooding in urban areas and complex open channel and overland flow systems. Traditional one dimensional (1D) models are used to simulate flow in river channels ...
By Innovyze
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Landslide Disaster Protection on the National Road Network, Cianjur, West Java, Indonesia - Case Study
Project Summary Project Two months before the annual Indonesian Homecoming Festival in West Java, a catastrophic landslide affected the road between Bogor and Cianjur, worsening the already terrible traffic situation on West Java’s main thoroughfare. The Ministry of Public Works retained PT. Wijaya Karya (WIKA) to provide an effective feasibility study while performing preventive measures ...
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Erosion index derived from terrain attributes using logistic regression and neural networks
Maps identifying areas prone to channel erosion within agricultural fields could be useful for conservation planners. The objective of this study was to test an approach for creating such maps with logistic regression and neural networks. Survey grade elevation measurements were obtained from on a Central Kentucky farm. The elevation measurements were used to create 4 by 4-m digital elevation ...
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Erosion index derived from terrain attributes using logistic regression and neural networks
Maps identifying areas prone to channel erosion within agricultural fields could be useful for conservation planners. The objective of this study was to test an approach for creating such maps with logistic regression and neural networks. Survey grade elevation measurements were obtained from on a Central Kentucky farm. The elevation measurements were used to create 4 by 4-m digital elevation ...
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Enhanced DEM-based flow path delineation methods for urban flood modelling
In order to simulate surface runoff and flooding, one-dimensional (1D) overland flow networks can be automatically delineated using digital elevation models (DEM). The resulting network comprises flow paths and terrain depressions/ponds and is essential to reliably model pluvial (surface) flooding events in urban areas by so-called 1D/1D models. Conventional automatic DEM-based flow path ...
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Exploring nature-based solutions - The role of green infrastructure in mitigating the impacts of weather- and climate change-related natural hazards
Natural resource scarcity, climate change impacts, continued employment crises, public budget debts and economic recovery plans are some of the challenges that governments in Europe currently face. Moreover, Member States in the European Union (EU) need to continue building or rebuilding roads, sewage systems, levees, etc. (also known as grey infrastructure). Despite being essential for economic ...
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