Filters








15 Hits in 11.5 sec

GeoNet: An open source software for the automatic and objective extraction of channel heads, channel network, and channel morphology from high resolution topography data

Harish Sangireddy, Colin P. Stark, Anna Kladzyk, Paola Passalacqua
2016 Environmental Modelling & Software  
We illustrate the new capabilities and features of GeoNet, an open source software for the extraction of channel heads, channel networks, and channel morphology from high resolution topography data.  ...  Extracting hydrologic and geomorphic features from high resolution topography data is a challenging and computationally demanding task.  ...  HS was partly supported by a USGS John Wesley Powell Center for Analysis and Synthesis as Fellow of the Powell Center Working Group on High Resolution Topography.  ... 
doi:10.1016/j.envsoft.2016.04.026 fatcat:c5wh3xs7krbsfeklwl22zwveaq

A semi-automated method for extracting channels and channel profiles from lidar-derived digital elevation models

Pinliang Dong, Ruofei Zhong, Jisheng Xia, Shucheng Tan
2020 Geosphere  
This paper introduces a semi-automated method for extracting stream channels and channel profiles from high-resolution DEMs using image processing techniques.  ...  The software and test data are freely available for download (see Supplemental Files1).  ...  For example, Cavalli et al. (2008) studied the performance of lidar data in the recognition channel-bed morphology; Passalacqua et al. (2010a) developed an automated method for channel network extraction  ... 
doi:10.1130/ges02188.1 fatcat:frzwng2vanc6npzvc2ettseani

lumpR: An R package facilitating landscape discretisation for hillslope-based hydrological models

Tobias Pilz, Till Francke, Axel Bronstert
2017 Geoscientific Model Development Discussions  
The package addresses existing limitations as it is free and open source, easily extendible to other hydrological models, and the workflow can be fully automated.  ...  <br><br> Consequently, a new package for the scientific software and scripting environment R, called <i>lumpR</i>, was developed. lumpR employs an algorithm for hillslope-based landscape discretisation  ...  P., Kladzyk, A., and Passalacqua, P.: GeoNet: An open source software for the automatic and objective extraction of channel heads, channel network, and channel morphology from high resolution topography  ... 
doi:10.5194/gmd-2017-17 fatcat:p3brrs77brbupbcln64hmv32qy

lumpR 2.0.0: an R package facilitating landscape discretisation for hillslope-based hydrological models

Tobias Pilz, Till Francke, Axel Bronstert
2017 Geoscientific Model Development  
The package addresses existing limitations as it is free and open source, easily extendible to other hydrological models, and the workflow can be fully automated.  ...  <br><br> Consequently, a new package for the scientific software and scripting environment R, called <i>lumpR</i>, was developed. lumpR employs an algorithm for hillslope-based landscape discretisation  ...  Student Lisa Berghäuser from the University of Potsdam is acknowledged for testing lumpR and giving valuable feedback and bug reports.  ... 
doi:10.5194/gmd-10-3001-2017 fatcat:maavqwrrprdc5no3axisuqzdym

Continental-scale high-resolution river geometry and real-time inundation mapping [article]

Zheng, Xing, 1994-
2018
Paola Passalacqua for her insights, patience and kindness. She teaches me how to be an excellent scholar as well as a nice person. I would like to thank Dr. Tim Whiteaker and Dr.  ...  They teach me many technical skills and also listen to the struggles in my life. I would like to thank Tongren Zhu and Bochao Zhan for helping me settle down on the new continent.  ...  David Maidment for his guidance and visions. Being his last PhD student is definitely the most glorious moment in my life so far.  ... 
doi:10.15781/t2ft8f361 fatcat:stp53ntsfbdj7c6wjukbkj7obq

Enhancing Operational Flood Detection Solutions through an Integrated Use of Satellite Earth Observations and Numerical Models

MAURO ARCORACE
2021
Starting from a review of advances in the flood modeling domain and a selection of the more suitable open toolsets available in the literature, a new method for the Rapid Estimation of FLood EXtent (REFLEX  ...  The input runoff volume is distributed from channel to hillslope cells of the DEM by using an iterative flood volume optimization based on Manning's equation.  ...  Jerome Benveniste of ESA who advised me multiple times with ideas and knowledge in the application of satellite altimetry for inland waters.  ... 
doi:10.15167/arcorace-mauro_phd2021-05-28 fatcat:y5yexvb465av7iarsskmh5bmea

The role of deep-seated landsliding in the geomorphic evolution of the Esk Valley, Hawke's Bay: an innovative approach to hazard evaluation [article]

Kerry John Leith, University Of Canterbury
2012
Evidence from seismic reflection surveys indicates that these have both been active since the early Mangapanian (2.8 - 3.2 Ma), and an analysis of stream longitudinal profiles and plan form suggests limited  ...  The identification of key geomorphic processes enabled the assessment of catchment's geomorphic stability, the development of generalised models for landsliding, and the delineation of a pre-disposed zone  ...  Recent tectonic uplift (2m, 1931) , aggradation in the valley and channel (c. 1 m, 1938) , and opening of the channel mouth with ongoing gravel extraction to maintain this, all would have had the effect  ... 
doi:10.26021/4899 fatcat:akt2jyvynjchffoby6jmmhl24u

Seismic hazard associated with the Springbank Fault, North Canterbury Plans [article]

Beatriz Elena Estrada, University Of Canterbury
2011
An earthquake of the above characteristics represents a significant seismic hazard for various urban centres in the near-fault zone including Ch [...]  ...  These faults, together with the Springbank and Hororata Faults and interpreted as part of a sys of trust/reverse faults propagating from a decollement located at mid-crustal depths of approximately 14  ...  data of the study area • To Richard Allmendinger for kindly providing me with his software for fold analysis and for his technical support • To Geonet, especially Hugh Cowan and Brian Ferris for supplying  ... 
doi:10.26021/6516 fatcat:mct33yxqyfg7xf6c6ovbawrz3i

GEOMATICS FOR EMERGENCY MANAGEMENT PURPOSES: DESIGN OF A GLOBAL GEODATABASE

Francesca Perez, P. Boccardo
2012
This environment is developed on a completely open source platform, for high availability and interoperability of derived applications and services.  ...  In order to provide a daily snow cover vector mapping service, this unit defined and implemented an automatic procedure oriented to the extraction of snow cover vector data from base satellite derived  ...  It proposes, also, further developments which refer mainly to the data management operations refinement and to the definition of future web services and applications based on data contained in the geodatabase  ... 
doi:10.6092/polito/porto/2496966 fatcat:q32daeds7rcfnjdp7vagbitbty

Surface rupture morphology and paleoseismology of the western Hope Fault and characteristics of seismically displaced boulders in the Port Hills, South Island, New Zealand [article]

Narges Khajavi, University Of Canterbury
2016
FDZ width measurements from 415 locations reveal a spatially-variable, active FDZ up to ~500 m wide with an average width of 200 m. Kinematic analysis of the fault st [...]  ...  These two studies are linked in that they investigate the near-field coseismic features of large (Mw ~7.1) earthquakes in New Zealand and produce data for evaluating seismic hazards of future earthquakes  ...  INFLUENCE OF TOPOGRAPHY AND BASEMENT DEPTH ON SURFACE RUPTURE MORPHOLOGY REVEALED FROM LIDAR AND FIELD MAPPING, HOPE FAULT, NEW ZELAND High-resolution airborne LiDAR and field mapping are used to investigate  ... 
doi:10.26021/8091 fatcat:sly7vte3fbdrpaezlye7inp6ee

Paraglacial Rockslope Stability [article]

Samuel Thomas McColl, University Of Canterbury
2013
This implies that ice-contact slope movement may be important for slope evolution and the erosion and entrainment processes of glaciers; and (2) the elastic strength of glacier ice at the high strain rates  ...  To explore this, numerical analyses of the interaction between glacial erosion, glacier mass, topography, and earthquake shaking intensity are undertaken.  ...  McSaveney, for the useful discussions on the origin of The Hillocks. Thanks to M. Ostermann for supplying photographs of similar features in Austria. We are thankful to an anonymous reviewer and P.  ... 
doi:10.26021/6854 fatcat:z3tcwg527verjixe2hal5odysa

Active Tectonics and Geomorphology of the central South Island, New Zealand: Earthquake Hazards of Reverse Faults [article]

Timothy Stahl, University Of Canterbury
2015
mapping, analysis of GPS and LiDAR survey data, and numerical modelling to characterise the rupture behaviour of these faults.  ...  This indicates an absence of uplift across the MFZ since c. 13 ka and suggests that this fault may be inactive or subject to long periods of interseismic quiescence despite its location in the active orogen  ...  Fig. 2 .3 & 2.6) and for dGPS data it is extracted from points recorded along a paced transect with an average point spacing of 1 m after processing.  ... 
doi:10.26021/6269 fatcat:56xtw2hksfe6lpnascgnqtyasu

Dry rock avalanche propagation:unconstrained flow experiments with granular materials and blocks at small scale

Irene Manzella
2008
., and Martin, C.D. 2007  ...  Front mass velocity The mass front is followed by means of a specialised software for image analysis (WINanalyze 1.4) which is able to automatically track objects in a film sequence (Heidenreich, 2004  ...  : an increase of a parameter from a row chosen from the left column causes a decrease of the characteristic at the head of the considered column; : an increase of a parameter from a row chosen from the  ... 
doi:10.5075/epfl-thesis-4032 fatcat:q5f2ek6xwfbifhpbl5eokkfiz4

Geometry and kinematics of the south leader fault: insights from the 2016 MW 7.8 Kaikoura earthquake [article]

Natalie T. Hyland-Brook, University Of Canterbury
2018
The resulting datasets were collected in the field, from terrestrial LiDAR and InSAR imagery, and from historical (pre-earthquake) aerial photographs for a ~11 km2 study area.  ...  The main objective of the thesis is to understand the key factors that contributed to the geometry and kinematics of the 2016 SLF rupture and its intersection with The Humps Fault (HF).  ...  and ranging (LiDAR), and high-resolution satellite data.  ... 
doi:10.26021/7380 fatcat:4maxistabvbnvf47yl4cmxukea

Vulnerability of Electric Power Systems to Volcanic Ashfall Hazards [article]

John Blackburn Wardman, University Of Canterbury
2013
Volcanic ash is an acute form of airborne pollution for areas downwind of active volcanoes.  ...  Results from laboratory experiments in this thesis suggest that insulator pollution (volcanic ash) performance (dielectric strength) is primarily dictated by (1) the conductivity of the ash, and (2) insulator  ...  We thank Dr Claire Horwell of Durham University, U.K., for providing us with analytical data for two samples of Pacaya tephra (shown in Appendix 6).  ... 
doi:10.26021/7885 fatcat:izuk6rcs2vgoromxejlk6hxjym