Assessment of Future Risks of Seasonal Municipal Water Shortages Across North America
While anthropogenic climate change poses a risk to freshwater resources across the globe through increases in evapotranspiration and temperature, it is essential to quantify the risks at local scales in response to projected trends in both freshwater supply and demand. In this study, we use empirica...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2021-09-01
|
| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2021.730631/full |
| _version_ | 1818643032157716480 |
|---|---|
| author | Joseph Janssen Joseph Janssen Valentina Radić Valentina Radić Ali Ameli Ali Ameli |
| author_facet | Joseph Janssen Joseph Janssen Valentina Radić Valentina Radić Ali Ameli Ali Ameli |
| author_sort | Joseph Janssen |
| collection | DOAJ |
| description | While anthropogenic climate change poses a risk to freshwater resources across the globe through increases in evapotranspiration and temperature, it is essential to quantify the risks at local scales in response to projected trends in both freshwater supply and demand. In this study, we use empirical modeling to estimate the risks of municipal water shortages across North America by assessing the effects of climate change on streamflow and urban water demand. In addition, we aim to quantify uncertainties in both supply and demand predictions. Using streamflow data from both the US and Canada, we first cluster 4,290 streamflow gauges based on hydrograph similarity and geographical location. We develop a set of multiple linear regression (MLR) models, as a simplified analog to a distributed hydrological model, with minimum input data requirements. These MLR models are calibrated to simulate streamflow for the 1993–2012 period using the ERA5 climate reanalysis data. The models are then used to predict streamflow for the 2080–2099 period in response to two climate scenarios (RCP4.5 and RCP8.5) from five global climate models. Another set of MLR models are constructed to project seasonal changes in municipal water consumption for the clustered domains. The models are calibrated against collected data on urban water use from 47 cities across the study region. For both streamflow and water use, we quantified uncertainties in our predictions using stochastic weather generators and Monte Carlo methods. Our study shows the strong predictive power of the MLR models for simulating both streamflow regimes (Kling-Gupta efficiency >0.5) and urban water use (correlation coefficient ≈0.7) in most regions. Under the RCP4.5 (RCP8.5) emissions scenario, the West Coast, the Southwest, and the Deep South (South-Central US and the Deep South) have the highest risk of municipal water shortages. Across the whole domain, the risk is the highest in the summer season when demand is high. We find that the uncertainty in projected changes to the water demand is substantially lower than the uncertainty in the projected changes to the supply. Regions with the highest risk of water shortages should begin to investigate mitigation and adaptation strategies. |
| first_indexed | 2024-12-16T23:52:30Z |
| format | Article |
| id | doaj.art-7b18cf79160043019c227dfa0deb4ce6 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-16T23:52:30Z |
| publishDate | 2021-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-7b18cf79160043019c227dfa0deb4ce62022-12-21T22:11:17ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-09-01910.3389/feart.2021.730631730631Assessment of Future Risks of Seasonal Municipal Water Shortages Across North AmericaJoseph Janssen0Joseph Janssen1Valentina Radić2Valentina Radić3Ali Ameli4Ali Ameli5Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, CanadaInstitute of Applied Mathematics, University of British Columbia, Vancouver, BC, CanadaDepartment of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, CanadaInstitute of Applied Mathematics, University of British Columbia, Vancouver, BC, CanadaDepartment of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, CanadaInstitute of Applied Mathematics, University of British Columbia, Vancouver, BC, CanadaWhile anthropogenic climate change poses a risk to freshwater resources across the globe through increases in evapotranspiration and temperature, it is essential to quantify the risks at local scales in response to projected trends in both freshwater supply and demand. In this study, we use empirical modeling to estimate the risks of municipal water shortages across North America by assessing the effects of climate change on streamflow and urban water demand. In addition, we aim to quantify uncertainties in both supply and demand predictions. Using streamflow data from both the US and Canada, we first cluster 4,290 streamflow gauges based on hydrograph similarity and geographical location. We develop a set of multiple linear regression (MLR) models, as a simplified analog to a distributed hydrological model, with minimum input data requirements. These MLR models are calibrated to simulate streamflow for the 1993–2012 period using the ERA5 climate reanalysis data. The models are then used to predict streamflow for the 2080–2099 period in response to two climate scenarios (RCP4.5 and RCP8.5) from five global climate models. Another set of MLR models are constructed to project seasonal changes in municipal water consumption for the clustered domains. The models are calibrated against collected data on urban water use from 47 cities across the study region. For both streamflow and water use, we quantified uncertainties in our predictions using stochastic weather generators and Monte Carlo methods. Our study shows the strong predictive power of the MLR models for simulating both streamflow regimes (Kling-Gupta efficiency >0.5) and urban water use (correlation coefficient ≈0.7) in most regions. Under the RCP4.5 (RCP8.5) emissions scenario, the West Coast, the Southwest, and the Deep South (South-Central US and the Deep South) have the highest risk of municipal water shortages. Across the whole domain, the risk is the highest in the summer season when demand is high. We find that the uncertainty in projected changes to the water demand is substantially lower than the uncertainty in the projected changes to the supply. Regions with the highest risk of water shortages should begin to investigate mitigation and adaptation strategies.https://www.frontiersin.org/articles/10.3389/feart.2021.730631/fullmultivariate regressionNorth Americawater supplywater demandrisk of municipal water shortagestreamflow |
| spellingShingle | Joseph Janssen Joseph Janssen Valentina Radić Valentina Radić Ali Ameli Ali Ameli Assessment of Future Risks of Seasonal Municipal Water Shortages Across North America Frontiers in Earth Science multivariate regression North America water supply water demand risk of municipal water shortage streamflow |
| title | Assessment of Future Risks of Seasonal Municipal Water Shortages Across North America |
| title_full | Assessment of Future Risks of Seasonal Municipal Water Shortages Across North America |
| title_fullStr | Assessment of Future Risks of Seasonal Municipal Water Shortages Across North America |
| title_full_unstemmed | Assessment of Future Risks of Seasonal Municipal Water Shortages Across North America |
| title_short | Assessment of Future Risks of Seasonal Municipal Water Shortages Across North America |
| title_sort | assessment of future risks of seasonal municipal water shortages across north america |
| topic | multivariate regression North America water supply water demand risk of municipal water shortage streamflow |
| url | https://www.frontiersin.org/articles/10.3389/feart.2021.730631/full |
| work_keys_str_mv | AT josephjanssen assessmentoffuturerisksofseasonalmunicipalwatershortagesacrossnorthamerica AT josephjanssen assessmentoffuturerisksofseasonalmunicipalwatershortagesacrossnorthamerica AT valentinaradic assessmentoffuturerisksofseasonalmunicipalwatershortagesacrossnorthamerica AT valentinaradic assessmentoffuturerisksofseasonalmunicipalwatershortagesacrossnorthamerica AT aliameli assessmentoffuturerisksofseasonalmunicipalwatershortagesacrossnorthamerica AT aliameli assessmentoffuturerisksofseasonalmunicipalwatershortagesacrossnorthamerica |