Incorporating the effects of increased atmospheric CO2 in watershed model projections of climate change impacts

Butcher, Jonathan B.; Johnson, Thomas E.; Nover, Daniel; Sarkar, Saumya

doi:10.1016/j.jhydrol.2014.03.073

Cited by 47 publications

(44 citation statements)

References 35 publications

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“…Implementations of SWAT can be found in various subjects including sediments transport, nutrients processes, and pesticide applications in varying watersheds of the world [29][30][31]. Modifications of SWAT and comparisons among alternative routing methods are available in literature [32][33][34][35][36].…”

Section: The Swat Modelmentioning

confidence: 99%

Assessment of Optional Sediment Transport Functions via the Complex Watershed Simulation Model SWAT

Yen

Feng

et al. 2017

Water

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Abstract:The Soil and Water Assessment Tool 2012 (SWAT2012) offers four sediment routing methods as optional alternatives to the default simplified Bagnold method. Previous studies compared only one of these alternative sediment routing methods with the default method. The proposed study evaluated the impacts of all four alternative sediment transport methods on sediment predictions: the modified Bagnold equation, the Kodoatie equation, the Molinas and Wu equation, and the Yang equation. The Arroyo Colorado Watershed, Texas, USA, was first calibrated for daily flow. The sediment parameters were then calibrated to monthly sediment loads, using each of the four sediment routing equations. An automatic calibration tool-Integrated Parameter Estimation and Uncertainty Analysis Tool (IPEAT)-was used to fit model parameters. The four sediment routing equations yielded substantially different sediment sources and sinks. The Yang equation performed best, followed by Kodoatie, Bagnold, and Molinas and Wu equations, according to greater model goodness-of-fit (represented by higher Nash-Sutcliffe Efficiency coefficient and percent bias closer to 0) as well as lower model uncertainty (represented by inclusion of observed data within 95% confidence interval). Since the default method (Bagnold) does not guarantee the best results, modelers should carefully evaluate the selection of alternative methods before conducting relevant studies or engineering projects.

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Section: The Swat Modelmentioning

confidence: 99%

Assessment of Optional Sediment Transport Functions via the Complex Watershed Simulation Model SWAT

Yen

Feng

et al. 2017

Water

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“…This is basically due to higher streamflow associated with a decrease in evapotranspiration, related to stomatal closure of plant leaves in response to increasing CO 2 concentration [14]. The forecast increase in sediment yield is probably overestimated, because SWAT overestimates the reduction of stomatal conductance due to increased CO 2 concentration [62,63] and consequently, the reduction in evapotranspiration. With increased CO 2 concentrations, the evapotranspiration capacity from all sources are reduced, including those that are not mediated by plant transpiration (i.e., evaporation properly attributed to canopy interception and surface soil storage) and, therefore, are not affected by changes in the behavior of leaf stomata.…”

Section: Effects Of Changes In Temperature Rainfall or Co 2 Concentrmentioning

confidence: 99%

Potential Impact of Climate Change on Suspended Sediment Yield in NW Spain: A Case Study on the Corbeira Catchment

Rodríguez‐Blanco

Arias

Taboada-Castro

et al. 2016

Water

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Soil losses and the subsequent sediment delivery constitute significant environmental threats. Climate change is likely to have an impact on the availability of water and therefore on sediment yield in catchments. In this context, quantifying the sediment response to an increased atmospheric CO 2 concentration and climate change is of utmost importance to the proper management of rural catchments. However, quantitative assessment of climate change impact remains a complex task. In this study, the potential medium (2031-2060) and long-term (2069-2098) impacts of projected changes of temperature, rainfall and CO 2 concentration on sediment yield in a small rural catchment located in NW Spain were evaluated using the Soil and Water Assessment Tool (SWAT) model. Climate change scenarios were created using future climate data projected by regional climate models from the ENSEMBLES project and two CO 2 concentration scenarios (550 and 660 ppm). The results showed that climate change would have a noticeable impact on suspended sediment if the forecast temperature, rainfall and CO 2 concentration changes included in this study were met. Overall, suspended sediment is expected to decrease (2031-2060: −11%, 2069-2098: −8%) compared to the baseline period , mainly due to decreased streamflow. However, an increase in sediment transport in winter is predicted, possibly associated with increased erosion in cultivated areas (11%-17%), suggesting that, at this time of the year, the effect of soil detachment prevails over sediment transport capacity. Consequently, management practices aimed at reducing soil erosion in cultivated areas should be carried out, because these are the main source of sediment in the study area.

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“…In order to account for this effect, we used new adjusted plant growth parameters that account for the effect of rising carbon dioxide emissions on increases in plants' water use efficiency. This reduces evapotranspiration and can potentially increase water flows in the Patuxent River (Butcher et al, 2014).…”

Section: Effect Of Climate Change On Bmp Performancementioning

confidence: 99%

Managing Water Quality in the Face of Uncertainty: A Robust Decision Making Demonstration for EPA's National Water Program

Fischbach¹,

Lempert²,

Molina-Pérez³

et al. 2015

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This document and trademark(s) contained herein are protected by law. This representation of RAND intellectual property is provided for noncommercial use only. Unauthorized posting of this publication online is prohibited. Permission is given to duplicate this document for personal use only, as long as it is unaltered and complete. Permission is required from RAND to reproduce, or reuse in another form, any of its research documents for commercial use. For information on reprint and linking permissions, please visit www.rand.org/pubs/permissions.html.The RAND Corporation is a research organization that develops solutions to public policy challenges to help make communities throughout the world safer and more secure, healthier and more prosperous. RAND is nonprofit, nonpartisan, and committed to the public interest.RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.Support RAND Make a tax-deductible charitable contribution at www.rand.org/giving/contribute www.rand.org Library of Congress Cataloging-in-Publication Data is available for this publication. For more information on this publication, visit www.rand.org/t/RR720Published by the RAND Corporation, Santa Monica, Calif. © Copyright 2015 RAND CorporationR® is a registered trademark. Cover image shared by ckramer via Flickr; CC BY 2.0.iii PrefaceThe U.S. Environmental Protection Agency (USEPA) Office of Research and Development sponsored a study by the RAND Corporation to explore how Robust Decision Making (RDM) methods could be used to manage climate change and other key uncertainties faced by USEPA's National Water Program. The study began in May 2011 and was completed in March 2014. This final project report provides results from two case studies that apply RDM to water quality decision processes at USEPA's Office of Water and partnering regional and state regulatory agencies. The results are intended to inform USEPA's efforts to better incorporate robustness and adaptivity into current programs when faced with deeply uncertain scientific information about future conditions. The research reported here was conducted in the RAND Environment, Energy, and Economic Development Program, which addresses topics relating to environmental quality and regulation, water and energy resources and systems, climate, natural hazards and disasters, and economic development, both domestically and internationally. Program research is supported by government agencies, foundations, and the private sector.This program is part of RAND Justice, Infrastructure, and Environment, a division of the RAND Corporation dedicated to improving policy and decisionmaking in a wide range of policy domains, including civil and criminal justice, infrastructure protection and homeland security, transportation and energy policy, and environmental and natural resource policy.Questions or comments about this report should be sent to the project leaders, Robert Lempert (lempert@rand.org) or Jordan Fischbach (Jordan_Fischbach@rand. org). For more informati...

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Incorporating the effects of increased atmospheric CO2 in watershed model projections of climate change impacts

Cited by 47 publications

References 35 publications

Assessment of Optional Sediment Transport Functions via the Complex Watershed Simulation Model SWAT

Assessment of Optional Sediment Transport Functions via the Complex Watershed Simulation Model SWAT

Potential Impact of Climate Change on Suspended Sediment Yield in NW Spain: A Case Study on the Corbeira Catchment

Managing Water Quality in the Face of Uncertainty: A Robust Decision Making Demonstration for EPA's National Water Program

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