Top 10 Eartharxiv Papers Today in Engineering


0.0 Mikeys
#1. Quantifying natural delta variability using a multiple-point geostatistics prior uncertainty model
Céline Scheidt, Anjali M Fernandes, Chris Paola, Jef Caers
We address the question of quantifying uncertainty associated with autogenic pattern variability in a channelized transport system by means of a modern geostatistical method. This question has considerable relevance for practical subsurface applications as well, particularly those related to uncertainty quantification relying on Bayesian approaches. Specifically, we show how the autogenic variability in a laboratory experiment can be represented and reproduced by a multiple-point geostatistical prior uncertainty model. The latter geostatistical method requires selection of a limited set of training images from which a possibly infinite set of geostatistical model realizations, mimicking the training image patterns, can be generated. To that end, we investigate two methods to determine how many training images and what training should be provided to reproduce natural autogenic variability. The first method relies on distance-based clustering of overhead snapshots of the experiment; the second method relies on a rate of change...
more | pdf
Figures
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 4
Total Words: 10315
Unqiue Words: 2723

0.0 Mikeys
#2. Effects of future urban planning on the Urban Heat Island intensity
Sylvain Labedens, Jean Louis Scartezzini, Dasaraden Mauree
Because of the global warming, urban planning strategies must be investigated to reduce the building energy consumption and increase the thermal comfort in cities. In the framework of Energy Strategy 2050 of Switzerland, this research highlights the impact of climate change on urban planning and proposes strategies to help urban planners and policymakers face this new challenge particularly in a future where heat waves are going to become common at mid- latitudes. First, this study proposes a methodology to cluster buildings in urban areas and use it in a mesoscale numerical weather prediction system to evaluate the urban heat island intensity and its impact on the energy demand for cooling at the city scale. Second, this research proposes urban planning strategies to reduce building energy consumption due to the urban heat island phenomenon in the city of Lausanne. The model has been validated with six different weather stations. It emphasizes the presence of the urban heat island in the Lemanic region which lead to the increase...
more | pdf
Figures
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 3
Total Words: 8676
Unqiue Words: 2288

0.0 Mikeys
#3. A nationwide regional flood frequency analysis at ungauged sites using ROI/GLS with copulas and super regions
Martin Durocher, Donald H. Burn, Shabnam Mostofi Zadeh
Region of influence is a common approach to estimate runoff information at ungauged locations. To estimate flood quantiles from annual maximum discharges, the Generalized Least Squares (GLS) framework has been recommended to account for unequal sampling variance and intersite correlation, which requires a proper evaluation of the sampling covariance structure. Since some jurisdictions do not have clear guidelines to perform this evaluation, a general procedure using copulas and a nonparametric intersite correlation model is investigated to estimate sampling covariance structure in situations where no common at-site distribution is imposed or when some paired sites do not have common periods of record. The investigated methodology is applied on 771 sites in Canada. The Normal copula is verified to be an adequate model that better fit paired observations than other types of extreme copulas. A sensitivity analysis is carried out to evaluate the impact of either ignoring, or considering a simpler form of, intersite correlation....
more | pdf
Figures
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 3
Total Words: 10988
Unqiue Words: 3666

0.0 Mikeys
#4. Backwater Controls on the Sedimentology, Kinematics and Geometry of Bar Deposits in Coastal Rivers
Anjali M Fernandes, Virginia B. Smith, Kashauna G. Mason
The backwater reach of coastal rivers is associated with considerable spatial and temporal variability in water and sediment flux. Here we test the hypothesis that the spatial and temporal variability in water flux and particle sizes in transport result in systematic changes in the geometry of bank-attached bars across the backwater transition. Measured transverse slopes of bank-attached bars in the Mississippi and Trinity Rivers show a systematic increase where the river transitions from normal flow to the backwater. We propose a simple force balance relationship, in which the transverse slope of the bars constructed through traction transport varies in proportion to the square of depth-averaged flow velocity and is inversely proportional to the square of the median particle size of the supplied sediment, in bends with similar curvature. The observed trend is therefore explained by a downstream reduction in particle sizes coupled with a downstream increase in flow velocity across the backwater transition at high flow.
more | pdf
Figures
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 3
Total Words: 4505
Unqiue Words: 1896

0.0 Mikeys
#5. A New Mechanism for Terrace Formation in Submarine Canyons
Anjali M Fernandes, David Mohrig, James Buttles
Deep canyons on Earth occur in both terrestrial and submarine environments, where they are carved by actively incising channels. Apparently similar flights of unpaired terraces, seen at the inside of bends in incised sinuous channels, are also common in both environments. Here we demonstrate a new mechanism for terrace formation that we believe is unique to settings where sediment transporting flows are only slightly denser than the ambient fluid, such as those encountered in submarine environments or on other planets and moons. Whereas it is well known that variable rates of river incision and lateral migration create bedrock terraces in river canyons, the processes responsible for their submarine counterparts are largely unexplored, limiting our ability to reconstruct canyon evolution and therefore landscape history in these environments. Tangential momentum in turbidity currents traversing canyon bends can cause currents to run far up the outer banks of bends, such that flow separates from inner banks. The result is very little...
more | pdf
Figures
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 3
Total Words: 6087
Unqiue Words: 3034

0.0 Mikeys
#6. Learning about climate change uncertainty enables flexible water infrastructure planning
Sarah Marie Fletcher, Megan Lickley, Kenneth Strzepek
Water resources planning requires making decisions about infrastructure development under substantial uncertainty in future regional climate conditions. However, uncertainty in climate change projections will evolve over the 100-year lifetime of a dam as new climate observations become available. Flexible strategies in which infrastructure is proactively designed to be changed in the future have the potential to meet water supply needs without over-building expensive infrastructure. Evaluating tradeoffs between flexible and traditional robust planning approaches requires extension of current scenario-based paradigms for water resources planning under climate uncertainty which take a static view of uncertainty. We develop a new dynamic planning framework that assesses the potential to learn about regional climate change over time and evaluates flexible approaches. We demonstrate it on a reservoir planning problem in Mombasa, Kenya. This approach identifies opportunities to reliably use flexible, incremental approaches,...
more | pdf
Figures
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 3
Total Words: 7624
Unqiue Words: 2697

0.0 Mikeys
#7. HYRISK: An R package for hybrid uncertainty analysis using probability, imprecise probability and possibility distributions
Jeremy Rohmer, manceau, Guyonnet, Boulahya, Dubois
Uncertainty analysis is an unavoidable risk assessment task (for instance for natural hazards, or for environmental issues). In situations where data are scarce, incomplete or imprecise, the systematic and only use of probabilities can be debatable. Over the last years, several alternative mathematical representation methods have been developed to handle in a more flexible manner the lack of knowledge related to input parameters of risk assessment models. This article presents an R package HYRISK dedicated to jointly handling different mathematical representation tools, namely probabilities, possibility distributions and probability functions with imprecise parameters, for the different stages of uncertainty treatment in risk assessments (i.e. uncertainty representation, propagation, sensitivity analysis and decision-making). We support the description using the case study of a dike stability analysis. The package is available at: https://cran.r-project.org/web/packages/HYRISK/index.html.
more | pdf
Figures
None.
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 5
Total Words: 5574
Unqiue Words: 1882

0.0 Mikeys
#8. Modifications to Internal Tide Conversion Parameterizations and Implementation into Barotropic Ocean Models
William James Pringle, Damrongsak Wirasaet, Joannes J. Westerink
Parameterization of the tidal energy conversion from barotropic to baroclinic modes through internal tide generation over rough and steep submarine topography is a necessary dissipative force for barotropic ocean models. We present and unify two forms of parameterizations that differ by assuming that wave generation is either only due to the local topographic features, or that it includes the effects of nonlocal topographic features. Previously reported implementation schemes on structured grids are extended to unstructured grids. A positive definite modification to the nonlocal generation formulation is recommended to ensure dissipation everywhere. Modifying the buoyancy frequency variable used in the formulations, in order to redistribute some of the dissipation from shallow water into deeper waters, is also proposed. MATLAB functions to compute the necessary parameters on both structured and unstructured grids are highlighted and made available.
more | pdf
Figures
Tweets
Github

Series of MATLAB scripts and functions for manipulating ADCIRC meshes, interpolation of bathymetry, and calculation of specific quantities

Repository: ADCIRC_MATLAB
User: WPringle
Language: Fortran
Stargazers: 3
Subscribers: 2
Forks: 3
Open Issues: 0
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 3
Total Words: 3414
Unqiue Words: 1292

0.0 Mikeys
#9. A network scale, intermediate complexity model for simulating channel evolution over years to decades
Roderick Lammers, Brian P Bledsoe
Excessive river erosion and sedimentation threatens critical infrastructure, degrades aquatic habitat, and impairs water quality. Tools for predicting the magnitude of erosion, sedimentation, and channel evolution processes are needed for effective mitigation and management. We present a new numerical model that simulates coupled river bed and bank erosion at the watershed scale. The model uses modified versions of Bagnold's sediment transport equation to simulate bed erosion and aggradation, as well as a simplified Bank Stability and Toe Erosion Model (BSTEM) to simulate bank erosion processes. The model is mechanistic and intermediate complexity, accounting for the dominant channel evolution processes while limiting data requirements. We apply the model to a generic test case of channel network response following a disturbance and the results match physical understanding of channel evolution. The model was also tested on two field data sets: below Parker Dam on the lower Colorado River and the North Fork Toutle River (NFTR)...
more | pdf
Figures
Tweets
Github

The River Erosion Model (REM), an intermediate complexity model for simulating stream channel evolution at the watershed scale.

Repository: REM
User: rodlammers
Language: HTML
Stargazers: 1
Subscribers: 1
Forks: 0
Open Issues: 1
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 2
Total Words: 12996
Unqiue Words: 3771

0.0 Mikeys
#10. Vulnerability of Louisiana’s coastal wetlands to present-day rates of relative sea-level rise
Krista L. Jankowski, Torbjörn E. Törnqvist, Anjali M Fernandes
Coastal Louisiana has lost about 5,000km2 of wetlands over the past century and concern exists whether remaining wetlands will persist while facing some of the world’s highest rates of relative sea-level rise (RSLR). Here we analyse an unprecedented data set derived from 274 rod surface-elevation table-marker horizon stations, to determine present-day surface-elevation change, vertical accretion and shallow subsidence rates. Comparison of vertical accretion rates with RSLR rates at the land surface (present-day RSLR rates are 12±8mm per year) shows that 65% of wetlands in the Mississippi Delta (SE Louisiana) may keep pace with RSLR, whereas 58% of the sites in the Chenier Plain (SW Louisiana) do not, rendering much of this area highly vulnerable to RLSR. At least 60% of the total subsidence rate occurs within the uppermost 5–10m, which may account for the higher vulnerability of coastal Louisiana wetlands compared to their counterparts elsewhere.
more | pdf
Figures
Tweets
Github
None.
Youtube
None.
Other stats
Sample Sizes : None.
Authors: 3
Total Words: 5792
Unqiue Words: 2058

About

Assert is a website where the best academic papers on arXiv (computer science, math, physics), bioRxiv (biology), BITSS (reproducibility), EarthArXiv (earth science), engrXiv (engineering), LawArXiv (law), PsyArXiv (psychology), SocArXiv (social science), and SportRxiv (sport research) bubble to the top each day.

Papers are scored (in real-time) based on how verifiable they are (as determined by their Github repos) and how interesting they are (based on Twitter).

To see top papers, follow us on twitter @assertpub_ (arXiv), @assert_pub (bioRxiv), and @assertpub_dev (everything else).

To see beautiful figures extracted from papers, follow us on Instagram.

Tracking 56,474 papers.

Search
Sort results based on if they are interesting or reproducible.
Interesting
Reproducible
Feedback
Online
Stats
Tracking 56,474 papers.