A scenario-based approach to integrating flow-ecology research with watershed development planning

Wu, Hong; Bolte, John P.; Hulse, David; Johnson, Bart R.

doi:10.1016/j.landurbplan.2015.08.012

Cited by 35 publications

(19 citation statements)

References 53 publications

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“…The selected flow metrics were total annual flow, flow duration, runoff coefficient (RC, annual streamflow divided by annual rainfall), high pulse, which is the number of times the daily hydrograph rises above the annual average flow (Wu et al, 2015), and fraction of days with streamflow ( f ), which is the number of flowing days divided by the number of days (0 < f < 1). The fraction of days with streamflow in the wet and dry seasons are indicated as fw and dry fd , respectively.…”

Section: Rainfall Scenariosmentioning

confidence: 99%

Simulated response of an intermittent stream to rainfall frequency patterns

Azarnivand

Camporese

Alaghmand

et al. 2019

Hydrological Processes

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The response of intermittent catchments to rainfall is complex and difficult to model. This study uses the spatially distributed CATchment HYdrology (CATHY) model to explore how the frequency of daily rainfall ( ) can affect the hydrologic regime of intermittent catchments. After a multi-objective calibration and validation of CATHY against experimental measurements of streamflow and groundwater levels in a catchment used as a pasture, the role of in affecting streamflow characteristics was explored using different scenarios. With different values of for the dry and wet periods of the year, CATHY showed that a series of frequent rainfall events was often associated with incipient streamflow, independent of the season. Activation of streamflow during the wet season was related to multiple factors and was not often associated with the shallow groundwater levels near the outlet of the catchment.The interplay between rainfall depth and intensity acted as the most important factor for the generation of streamflow. Using the difference between accumulated rainfall and evapotranspiration as a measure of wetness, saturated subsurface flow mechanism generated streamflow in simulations with wetness at least three times larger than mean wetness of other simulations. Although groundwater uprise near the outlet did not effectively contribute to streamflow in the initial days of flow, it strongly correlated with the magnitude of the runoff coefficient. Values of close or equal to the maximum value in the wet season can sustain the connectivity between groundwater and streamflow in the riparian zone. This connectivity increases the catchment wetness, which consequently results in an increase of the generated streamflow. Our study showed that rainfall regimes characterized by different were able to identify distinct flow regimes typical of either intermittent, ephemeral, or nonflowing catchments. Decrease of in the wet season is likely associated with a reduction of streamflow, with a shift of flow regime from intermittent to ephemeral or no-flow.

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Section: Rainfall Scenariosmentioning

confidence: 99%

Simulated response of an intermittent stream to rainfall frequency patterns

Azarnivand

Camporese

Alaghmand

et al. 2019

Hydrological Processes

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“…We designed a 2 × 2 combination of land development scenarios representing two regional population growth patterns (compact vs. dispersed growth) and two stormwater management approaches (with vs. without ISM). The assumptions and policy emphases of the four scenarios are presented in Table , and the parameterization of each scenario was described in detail in Wu et al (). The compact growth scenarios represented a continuation of current statewide planning practices that concentrate 90% of population growth into UGBs, whereas the dispersed growth scenarios responded to challenges to Oregon's planning laws and relaxed rural development constraints by dispersing 35% of population growth into rural areas.…”

Section: Methodsmentioning

confidence: 99%

“…To explore ways to integrate the three components above, we established a three‐step modelling framework that included land use simulation, hydrological modelling, and hydrological assessment (Figure ). Details of this framework were articulated in an earlier publication (Wu, Bolte, Hulse, & Johnson, ), which investigated the impacts of urbanization alone. To avoid redundancy, we present an overview of the framework as follows.…”

Section: Introductionmentioning

confidence: 99%

Climate change will both exacerbate and attenuate urbanization impacts on streamflow regimes in southern Willamette Valley, Oregon

Johnson

2019

River Research & Apps

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Interactions between climate change and urbanization may affect stream ecosystems in unexpected ways. With an integrated modelling framework, we assessed the combined hydrological impacts of climate change and urbanization under historical and future climate regimes across varied development scenarios in three watersheds in the Willamette Valley, Oregon. First, through an agent-based land use change model Envision, we created four development scenarios that consisted of 2 × 2 combinations of regional growth (compact population growth in urban cores vs. dispersed growth into rural areas) and stormwater management scenarios (with vs. without integrated stormwater management, ISM). ISM was defined as the integration of strategic organization of land uses with site-scale stormwater best management practices. Next, two future climate regimes were developed by statistically downscaling projections from two general circulation models (CanESM2 and CNRM-CM5) that performed well in replicating historical climate. The hydrological assessment of these scenarios was then conducted with the Soil and Water Assessment Tool. Using 10 ecologically significant flow metrics, we evaluated each scenario based on the magnitude of change in each metric and the degree to which such changes could be mitigated. Climate change alone led to a drying trend in flow regimes under both future climates. Combined with urbanization, it magnified changes in six of 10 metrics but attenuated impacts for three other measures of flashiness in at least one basin. The combination of compact growth and ISM effectively mitigated alterations for seven (out of nine) metrics sensitive to the combined impacts in at least one basin, with ISM being more effective than compact growth. The modelling framework teased out both nuanced differences and generalizable trends in hydrological impacts of urbanization and climate change and offers key methodological innovations towards an integrated framework capable of linking landscape planning mechanisms with the goal of sustaining stream ecosystem health. KEYWORDS alternative futures, climate change, hydrological impact, land use change, flow metric, regional growth pattern, integrated stormwater management

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“…Sources of nutrients can influence the type of treatment that is effective for its removal. Wu, Bolte et al (2015) reported 73% and 48% of phosphorus was attached to particles between 10-50 µm in roof and road runoff, respectively, while nitrogen was mainly in the dissolved phase in both runoffs. Charters et al (2015) further explores the implications of particle size distribution on the selection of stormwater treatment practices, suggesting that devices with short retention times may be inadequate to remove TSS from stormwater across all rain events.…”

Section: Stormwater Quantitymentioning

confidence: 98%

“…Baek et al (2015) proposed a methodology to optimize LID selection for reductions in first flush effects. impacts remain difficult to predict as ecological responses to hydrologic variables is not well defined for most aquatic systems (Wu, Bolte et al, 2015;.…”

Section: Watershed-scale Lid Assessmentmentioning

confidence: 99%

Urban Stormwater Characterization, Control, and Treatment

Vogel

Moore²

2016

Water Environment Research

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The following review presents a synthesis of 181 journal articles published during 2015 that represent progress toward better characterizing, controlling, and treating urban stormwater runoff. The review is structured by general topical areas related to (1) stormwater quality and quantity characterization; (2) engineered stormwater control and treatment practices, including erosion and sediment control, stormwater ponds, constructed stormwater wetlands, bioretention, permeable pavement, greenroofs, and rainwater harvesting systems; and (3) watershed-scale modeling and optimization of stormwater control and treatment practices. Common research themes emerging from this collection of studies include potential to enhance hydrologic and pollutant treatment performance of stormwater practices via media amendments and the use of innovative outlet control structures, as well as development of a more mechanistic understanding of hydrologic and water-quality functions to inform modeling and performance predictions. These studies serve to expand the field's knowledge base and will inform future efforts to further improve stormwater control and treatment at various spatial and temporal scales.

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A scenario-based approach to integrating flow-ecology research with watershed development planning

Cited by 35 publications

References 53 publications

Simulated response of an intermittent stream to rainfall frequency patterns

Simulated response of an intermittent stream to rainfall frequency patterns

Climate change will both exacerbate and attenuate urbanization impacts on streamflow regimes in southern Willamette Valley, Oregon

Urban Stormwater Characterization, Control, and Treatment

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