Latitudinal trends in modern fluvial erosional efficiency along the Andes

TRRP Training: 2022 Program

presented by: GSI Environmetal Inc.

Texas Risk Reduction Program regulations (TRRP; 30 TAC 350) establish consistent risk-based protocols for assessment and response to soil, groundwater, or surface water impacts associated with environmental releases of regulated wastes or substances.

Presented by GSI Environmental Inc., this popular and informative training series is a must for professionals who need a working understanding of TRRP and those needing to stay up-to-date with the latest TCEQ TRRP guidance and policies.

TRRP Training Course (2 Days): Provides an overview of the TRRP framework and step-by-step training on property assessment and response action procedures established under the TRRP rule

Attendees will become acquainted with rules, key guidance and policies covering affected property assessments, protective concentration levels, and response actions. The course material presents strategies for efficient project management in compliance with TRRP and explains the various report forms adopted by TCEQ.

Dates and Location

Dates

June 14th and 15th, 2022

Location

Crowne Plaza River Oaks 2712 SW Freeway Houston, Texas 77098 713.523.8448 http://www.crowneplaza.com/

Price and Registration

Early-Bird Price

(Paid by May 1, 2022)
$XXX

Standard Price

(Paid after May 1, 2022)
$XXX

TAEP Membership Price

$XXX

Government Price

$XXX

Lodging and meals are not
included in course cost

Authors: Clayton S. Sorensen, Brian J. Yanites

Published: January 2019 in Wisconsin Department of Natural Resources, Madison, Wisconsin, Publication.

Abstract

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Latitude is a dominant control on climate, influencing both temperature and precipitation, leading to potential gradients in erosional efficiency. Previous work focused on the latitudinal control of glacial erosion on topography; however, the expected latitudinal trend in erosional efficiency in the absence of glacial processes is unknown. We parameterize a suite of numerical models using uniform rock-uplift and climate from the Andes to explore how latitudinal patterns of rainfall could influence the efficiency of fluvial bedrock erosion. We use the CHILD landscape evolution model parameterized with storm duration, intensity and frequency statistics from NCEP/NCAR Reanalysis data along the Andes over 31 years to predict latitudinal trends in topography subject only to fluvial and hillslope erosion. Modeled elevations, as a metric for erosional efficiency, vary 2–30 fold depending on the erosional and hydrological model parameterization. Modeled elevation trends generated using stochastic storm generation vary significantly from those generated using mean annual precipitation (MAP). The variation suggests MAP may not capture the true erosional efficiency of the modern climate in some locations, but may in others, explaining the discrepancy of conclusions in previous studies. Erosional efficiency is greatest in the tropics (5–15°S) where high intensity and frequent storms occur and mid-latitudes (30–35°S) where less frequent but intense storms occur. Erosional efficiency is lowest in the subtropics (20 to 25°S) where low intensity and infrequent storms occur and upper-mid-latitudes (45–50°S) where low intensity and somewhat frequent storms occur. Erosional efficiency varies across the width of the orogen because of acrossorogen effects. The results provide further evidence supporting climate’s control on erosion processes and topography, highlighting the importance of stochastic storm distributions and suggesting that latitudinal controls on rainfall can explain some observed trends in topography. The modern latitudinal trend in topography is frequently used as an argument for a glacial buzzsaw; however, our results suggest more information on the preglacial distribution of topography is needed to justify such an argument since latitude dependent rainfall regimes may generate similar topographic trends.