Modeled intermittency risk for small streams in the Upper Colorado River Basin under climate change

Reynolds, Lindsay V.; Shafroth, Patrick B.; Poff, N. LeRoy

doi:10.1016/j.jhydrol.2015.02.025

Cited by 90 publications

(101 citation statements)

References 65 publications

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“…In these areas, application of irrigation may be required in order to carry out dry season cropping. This finding is in line with a similar study by Berhanu, Seleshi, Demisse, and Melesse (2015) in Ethiopian rivers, and Reynolds et al (2015) in upper Colorado River basin, USA. The results are also in agreement with those obtained by Ogunkoya (1989), Adejuwon, Jeje, and Ogunkoya (1983), and Ogban and Babalola (2009) in their respective studies in parts of southwest Nigeria.…”

Section: Discussionsupporting

confidence: 93%

“…On the other hand, wetlands of low-sloped terrains (VS and LD valleys) had limited groundwater contribution to surface flows, particularly during the dry periods. They may be perennial or seasonal depending on their slope characteristics, position on the landscape, and other geologic, basin, and climatic conditions (Reynolds, Shafroth, & Poff, 2015). The plots show that Am and VS inland valley types had perennial surface water with water levels above 0-cm stage (ground surface) throughout the year.…”

Section: Discussionmentioning

confidence: 99%

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Hydro-period dynamics of some inland valley agroecosystems in southwest Nigeria

Aboyeji

2016

African Geographical Review

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The potential use of inland valley ecosystems (a category of wetlands) for cropping has not been fully exploited due to their heterogeneity in hydrology, morphology, soil types and agro-economy. The study employed the hydro-period approach to investigate the dynamics of surface waters of six inland valley sites. Hydrographs and hydro-periods of the sites were determined using water-level fluctuation data collected using staff gages. Results show that water level rose gradually from the beginning of the rain season, peaked at the end of the season, and receded gradually until the hydrological peak of dry season in amphitheatre and valley-side valley types. In the low depression valleys, the plots indicate a more instantaneous response to rainfall events with little groundwater flow. The work concluded that amphitheatre and valley-side valleys types are perennial with high base flows and low flow variability, and hence should be suitable for year-round cropping with little or no application of irrigation. On the other hand, the stage-duration curves of the depression valleys are characteristics of seasonal streams occurring in low-sloped topography with largely rain-caused floods, low base flow, and high flow variability. Application of irrigation may be required for dry season cropping in these valleys.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Hydro-period dynamics of some inland valley agroecosystems in southwest Nigeria

Aboyeji

2016

African Geographical Review

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“…Future changes of hydrological variables are larger in the dry season (November -April) than in the wet season (May -October) of the three river systems, the Ganges, Brahmaputra and Meghna in Bangladesh (Masood et al 2015). The perennial streams in the Upper Colorado River Basin in the USA that have high minimum-flow variability and low mean flows are likely to be most susceptible to increasing streamflow intermittency in the future (Reynolds et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Assessing the flow alteration of temporary streams under current conditions and changing climate by Soil and Water Assessment Tool model

Tzoraki

Girolamo

Gamvroudis

et al. 2015

International Journal of River Basin Management

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A new approach, the 'Naturalness Status' (NS), is suggested to classify the hydrologic alteration of temporary rivers from natural conditions based on the Hydrological Status Tool (HS-Tool). The HS-Tool considers two metrics: the degree and the predictability of dry flow conditions for both natural flow and its alterations, at each water body in actual and natural conditions. The Soil and Water Assessment Tool (SWAT) model is simulating the river flow of Evrotas water bodies, Greece, under natural, actual and climate-impacted conditions. The majority of Evrotas water bodies (72%) experience good (low-impacted) NS for the examined period (1990 -2010), despite their intermittent flow regime. Severe flow alteration is predicted for 57% of Evrotas water bodies (high-impacted NS), while selecting the KNMI-RACMO2 future climate projections scenario (2020-2060) as input into the SWAT model. Hydrologic extreme drought phenomena or anthropogenic pressures in water regime can be quantified by the NS. The method is intended to be used in basin decision-making analysis at fulfilling the Water Framework Directive goals.

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“…Random forests is a non-linear, multi-variate classification and regression process that uses a collection of independent decision trees to produce robust (low variance) and low bias predictions [24]. Random forests methods are popular classification tools in ecological studies (for example [25][26][27]), and are being used more frequently in hydrologic investigations (for example [28][29][30][31][32][33]). Random forests methods have advantages over other modeling methods, such as regression, in that they do not require data to be transformed, can use categorical data, can autonomously fit non-linear relations, and can automatically incorporate interactions between explanatory variables [24,34].…”

mentioning

confidence: 99%

“…Water 2018, 10, x FOR PEER REVIEW 3 of 17 used more frequently in hydrologic investigations (for example [28][29][30][31][32][33]). Random forests methods have advantages over other modeling methods, such as regression, in that they do not require data to be transformed, can use categorical data, can autonomously fit non-linear relations, and can automatically incorporate interactions between explanatory variables [24,34].…”

mentioning

confidence: 99%

Managing Salinity in Upper Colorado River Basin Streams: Selecting Catchments for Sediment Control Efforts Using Watershed Characteristics and Random Forests Models

Tillman

Anning

Heilman

et al. 2018

Water

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Elevated concentrations of dissolved-solids (salinity) including calcium, sodium, sulfate, and chloride, among others, in the Colorado River cause substantial problems for its water users. Previous efforts to reduce dissolved solids in upper Colorado River basin (UCRB) streams often focused on reducing suspended-sediment transport to streams, but few studies have investigated the relationship between suspended sediment and salinity, or evaluated which watershed characteristics might be associated with this relationship. Are there catchment properties that may help in identifying areas where control of suspended sediment will also reduce salinity transport to streams? A random forests classification analysis was performed on topographic, climate, land cover, geology, rock chemistry, soil, and hydrologic information in 163 UCRB catchments. Two random forests models were developed in this study: one for exploring stream and catchment characteristics associated with stream sites where dissolved solids increase with increasing suspended-sediment concentration, and the other for predicting where these sites are located in unmonitored reaches. Results of variable importance from the exploratory random forests models indicate that no simple source, geochemical process, or transport mechanism can easily explain the relationship between dissolved solids and suspended sediment concentrations at UCRB monitoring sites. Among the most important watershed characteristics in both models were measures of soil hydraulic conductivity, soil erodibility, minimum catchment elevation, catchment area, and the silt component of soil in the catchment. Predictions at key locations in the basin were combined with observations from selected monitoring sites, and presented in map-form to give a complete understanding of where catchment sediment control practices would also benefit control of dissolved solids in streams.

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Modeled intermittency risk for small streams in the Upper Colorado River Basin under climate change

Cited by 90 publications

References 65 publications

Hydro-period dynamics of some inland valley agroecosystems in southwest Nigeria

Hydro-period dynamics of some inland valley agroecosystems in southwest Nigeria

Assessing the flow alteration of temporary streams under current conditions and changing climate by Soil and Water Assessment Tool model

Managing Salinity in Upper Colorado River Basin Streams: Selecting Catchments for Sediment Control Efforts Using Watershed Characteristics and Random Forests Models

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