Effects of digital terrain model uncertainties on high‐resolution urban flood damage assessment

2019 ◽  
Vol 12 (S2) ◽  
Author(s):  
Chiara Arrighi ◽  
Lorenzo Campo
Keyword(s):  
High Resolution ◽  
Damage Assessment ◽  
Digital Terrain Model ◽  
Flood Damage ◽  
Model Uncertainties ◽  
Urban Flood ◽  
Terrain Model ◽  
Digital Terrain ◽  
Flood Damage Assessment

scholarly journals Rapid urban flood damage assessment using high resolution remote sensing data and an object-based approach

2020 ◽  
Vol 11 (1) ◽  
pp. 906-927 ◽  
Author(s):  
Sergio Iván Jiménez-Jiménez ◽  
Waldo Ojeda-Bustamante ◽  
Ronald Ernesto Ontiveros-Capurata ◽  
Mariana de Jesús Marcial-Pablo
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Damage Assessment ◽  
Remote Sensing Data ◽  
Flood Damage ◽  
Urban Flood ◽  
Sensing Data ◽  
Object Based ◽  
Flood Damage Assessment

scholarly journals High-resolution topography for Digital Terrain Model (DTM) in Keller Peninsula, Maritime Antarctica

2018 ◽  
Vol 90 (2 suppl 1) ◽  
pp. 2001-2010 ◽  
Author(s):  
ADRIANO L. SCHÜNEMANN ◽  
PEDRO HENRIQUE A. ALMEIDA ◽  
ANDRÉ THOMAZINI ◽  
ELPÍDIO I. FERNANDES FILHO ◽  
MÁRCIO R. FRANCELINO ◽  
...  
Keyword(s):  
High Resolution ◽  
Digital Terrain Model ◽  
Maritime Antarctica ◽  
Terrain Model ◽  
Digital Terrain

scholarly journals New Geomorphological and Historical Elements on Morpho-Evolutive Trends and Relative Sea-Level Changes of Naples Coast in the Last 6000 Years

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2651 ◽  
Author(s):  
Gaia Mattei ◽  
Pietro Aucelli ◽  
Claudia Caporizzo ◽  
Angela Rizzo ◽  
Gerardo Pappone
Keyword(s):  
High Resolution ◽  
Sea Level ◽  
Digital Terrain Model ◽  
Optical Data ◽  
Sea Level Changes ◽  
Historical Sources ◽  
Relative Sea Level ◽  
Terrain Model ◽  
Digital Terrain ◽  
Geomorphological Map

This research aims to present new data regarding the relative sea-level variations and related morpho-evolutive trends of Naples coast since the mid-Holocene, by interpreting several geomorphological and historical elements. The geomorphological analysis, which was applied to the emerged and submerged sector between Chiaia plain and Pizzofalcone promontory, took into account a dataset that is mainly composed of: measurements from direct surveys; bibliographic data from geological studies; historical sources; ancient pictures and maps; high-resolution digital terrain model (DTM) from Lidar; and, geo-acoustic and optical data from marine surveys off Castel dell’ Ovo carried out by using an USV (Unmanned Surface Vehicle). The GIS analysis of those data combined with iconographic researches allowed for reconstructing the high-resolution geomorphological map and three new palaeoenvironmental scenarios of the study area during the Holocene, deriving from the evaluation of the relative sea-level changes and vertical ground movements of volcano-tectonic origin affecting the coastal sector in the same period. In particular, three different relative sea-level stands were identified, dated around 6.5, 4.5, and 2.0 ky BP, respectively at +7, −5, and −3 m MSL, due to the precise mapping of several paleo-shore platforms that were ordered based on the altimetry and dated thanks to archaeological and geological interpretations.

scholarly journals Coastal flooding of urban areas by overtopping: dynamic modelling application to the Johanna storm (2008) in Gâvres (France)

2015 ◽  
Vol 15 (11) ◽  
pp. 2497-2510 ◽  
Author(s):  
S. Le Roy ◽  
R. Pedreros ◽  
C. André ◽  
F. Paris ◽  
S. Lecacheux ◽  
...  
Keyword(s):  
High Resolution ◽  
Urban Area ◽  
Urban Areas ◽  
Digital Terrain Model ◽  
Time Dependent ◽  
Shock Capturing ◽  
Terrain Model ◽  
Digital Terrain ◽  
Very High ◽  
Water Depths

Abstract. Recent dramatic events have allowed significant progress to be achieved in coastal flood modelling over recent years. Classical approaches generally estimate wave overtopping by means of empirical formulas or 1-D simulations, and the flood is simulated on a DTM (digital terrain model), using soil roughness to characterize land use. The limits of these methods are typically linked to the accuracy of overtopping estimation (spatial and temporal distribution) and to the reliability of the results in urban areas, which are places where the assets are the most crucial. This paper intends to propose and apply a methodology to simulate simultaneously wave overtopping and the resulting flood in an urban area at a very high resolution. This type of 2-D simulation presents the advantage of allowing both the chronology of the storm and the particular effect of urban areas on the flows to be integrated. This methodology is based on a downscaling approach, from regional to local scales, using hydrodynamic simulations to characterize the sea level and the wave spectra. A time series is then generated including the evolutions of these two parameters, and imposed upon a time-dependent phase-resolving model to simulate the overtopping over the dike. The flood is dynamically simulated directly by this model: if the model uses adapted schemes (well balanced, shock capturing), the calculation can be led on a DEM (digital elevation model) that includes buildings and walls, thereby achieving a realistic representation of the urban areas. This methodology has been applied to an actual event, the Johanna storm (10 March 2008) in Gâvres (South Brittany, in western France). The use of the SURF-WB model, a very stable time-dependent phase-resolving model using non-linear shallow water equations and well-balanced shock-capturing schemes, allowed simulating both the dynamics of the overtopping and the flooding in the urban area, taking into account buildings and streets thanks to a very high resolution (1 m). The results obtained proved to be very coherent with the available reports in terms of overtopping sectors, flooded area, water depths and chronology. This method makes it possible to estimate very precisely not only the overtopping flows, but also the main characteristics of flooding in a complex topography like an urban area, and indeed the hazard at a very high resolution (water depths and vertically integrated current speeds). The comparison with a similar flooding simulation using a more classical approach (a digital terrain model with no buildings, and a representation of the urban area by an increased soil roughness) has allowed the advantages of an explicit representation of the buildings and the streets to be identified: if, in the studied case, the impact of the urbanization representation on water levels does indeed remain negligible, the flood dynamics and the current speeds can be considerably underestimated when no explicit representation of the buildings is provided, especially along the main streets. Moreover, on the seaside, recourse to a time-dependent phase-resolving model using non-stationary conditions allows a better representation of the flows caused by overtopping. Finally, this type of simulation is shown to be of value for hazard studies, thanks to the high level of accuracy of the results in urban areas where assets are concentrated. This methodology, although it is currently still quite difficult to implement and costly in terms of calculation time, can expect to be increasingly resorted to in years to come, thanks to the recent developments in wave models and to the increasing availability of LiDAR data.

scholarly journals Application of 30m Resolution SRTM DEM in Nepal

2018 ◽  
Vol 14 (1) ◽  
pp. 235-240 ◽  
Author(s):  
Raghunath Jha
Keyword(s):  
High Resolution ◽  
Digital Terrain Model ◽  
Topographic Map ◽  
Srtm Dem ◽  
Terrain Model ◽  
Digital Terrain ◽  
Digital Elevation ◽  
Raster Analysis ◽  
Elevation Model ◽  
Almost All

 Digital Terrain Model (DTM) or Digital Elevation Model (DEM) is an important data for Raster Analysis in modern GIS. Its use is extremely important for almost all fields of engineering, especially Water Resources Engineering. In Nepal, high-resolution DTM is not available, and often funds are limited to generate high-resolution DTM using modern day technology such as LiDAR or Aerial Photography. As a result most of the works are based on SRTM DEM which is available free of cost. Presently, 1arc second DTM is available in SRTM for Nepalese Territories. In this study, the applicability of 1arc second or 30m resolution SRTM is checked in comparison with the Department of Survey Digital Topographic Map. It is found that SRTM DEM performs better than DEM generated from Data available with Survey Department.Journal of the Institute of Engineering, 2018, 14(1): 235-240

scholarly journals Asymmetric Craters on the Dwarf Planet Ceres—Results of Second Extended Mission Data Analysis

Geosciences ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 475
Author(s):  
Katrin Krohn ◽  
Ralf Jaumann ◽  
Kai Wickhusen ◽  
Katharina Otto ◽  
Elke Kersten ◽  
...  
Keyword(s):  
Data Analysis ◽  
High Resolution ◽  
Morphological Characteristics ◽  
Digital Terrain Model ◽  
Successful Operation ◽  
Terrain Model ◽  
Digital Terrain ◽  
High Resolution Images ◽  
Sloping Surface

After almost three years of successful operation on Ceres, the Dawn spacecraft entered its last orbits around the dwarf planet and obtained a set of high-resolution images of 3 to 5 m/pixel. These images reveal a variety of morphologic features, including a set of asymmetric crater morphologies as observed earlier in the mission on the asteroid Vesta. We identified 269 craters, which are located between 60° N to 60° S latitude and 197° E to 265° E longitude, and investigated their morphological characteristics using a digital terrain model (DTM). These craters range in diameter from 0.30 to 4.2 km, and exhibit a sharp crater rim on the uphill side and a smooth one on the downhill side. We found that all asymmetric craters are formed on a sloping surface with the majority appearing at slope angles between 5 and 20 degrees. This implies that, as observed on Vesta, the topography is the main cause for these asymmetries.

Sign in / Sign up

Export Citation Format

Share Document