Consistency of Hydrologic Relationships of a Paired Watershed Approach

Ssegane, Herbert; Amatya, Devendra M.; Chescheir, G. M.; Skaggs, Wayne; Tollner, E. W.; Nettles, Jami E.

doi:10.4236/ajcc.2013.22015

Cited by 24 publications

(28 citation statements)

References 50 publications

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“…Prior to the complete harvest of D1, the D1 WTE was higher than D2 (Table ; January to April of 2009), consistent with earlier studies (Amatya & Skaggs, ; Ssegane et al, ), whereas D2 flow was greater than D1 flow (Table ). However, after harvest of D1 (2010 to 2012), the difference in D1 and D2 flow was mostly positive (D1 flow greater than D2 flow) during the growing season and negative (D2 flow greater than D1 flow) during the dormant season.…”

Section: Resultssupporting

confidence: 88%

“…The average difference of WTE between D0 and D2 was 17.3 ± 0.9 cm (±95% CI), 22.5 ± 0.8 cm between D1 and D2, and 9.1 ± 0.6 cm between D3 and D2. The differences between control and treatment watersheds for the 2009 to 2012 pretreatment calibration period were significantly greater than the differences observed using the historical data (Ssegane et al, ), except between D0 and D2 (because D0 was established in 2009).…”

Section: Resultsmentioning

confidence: 59%

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Calibration of paired watersheds: Utility of moving sums in presence of externalities

Ssegane

Amatya

Muwamba

et al. 2017

Hydrological Processes

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Historically, paired watershed studies have been used to quantify the hydrological effects of land use and management practices by concurrently monitoring 2 similar watersheds during calibration (pretreatment) and post‐treatment periods. This study characterizes seasonal water table and flow response to rainfall during the calibration period and tests a change detection technique of moving sums of recursive residuals (MOSUM) to select calibration periods for each control–treatment watershed pair when the regression coefficients for daily water table elevation were most stable to minimize regression model uncertainty. The control and treatment watersheds were 1 watershed of 3–4‐year‐old intensely managed loblolly pine (Pinus taeda L.) with natural understory, 1 watershed of 3–4‐year‐old loblolly pine intercropped with switchgrass (Panicum virgatum), 1 watershed of 14–15‐year‐old thinned loblolly pine with natural understory (control), and 1 watershed of switchgrass only. The study period spanned from 2009 to 2012. Silvicultural operational practices during this period acted as external factors, potentially shifting hydrologic calibration relationships between control and treatment watersheds. MOSUM results indicated significant changes in regression parameters due to silvicultural operations and were used to identify stable relationships for water table elevation. None of the calibration relationships developed using this method were significantly different from the classical calibration relationship based on published historical data. We attribute that to the similarity of historical and 2010–2012 leaf area index on control and treatment watersheds as moderated by the emergent vegetation. Although the MOSUM approach does not eliminate the need for true calibration data or replace the classic paired watershed approach, our results show that it may be an effective alternative approach when true data are unavailable, as it minimizes the impacts of external disturbances other than the treatment of interest.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 59%

Calibration of paired watersheds: Utility of moving sums in presence of externalities

Ssegane

Amatya

Muwamba

et al. 2017

Hydrological Processes

Self Cite

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“…The UPC watershed experiment uses a paired watershed approach with a BACI design, the advantages and disadvantages of which are summarized by Ssegane et al (2013). This approach allows climatic and hydrologic differences to be controlled between watersheds, providing an opportunity to demonstrate hydrologic response to forest management or to changes in ecosystem composition.…”

Section: Experimental Designmentioning

confidence: 99%

Streamflow response to clear‐cut logging on British Columbia's Okanagan Plateau

Winkler

Spittlehouse

Boon³

2017

Ecohydrology

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The Upper Penticton Creek watershed experiment has collected 28 years of streamflow data from 2 small snow-dominated watersheds on the Okanagan Plateau of British Columbia, where the effects of timber harvesting on streamflow regime are of broad concern. We apply 3 empirical analysis techniques to these data to evaluate changes in streamflow regime following clear-cut logging of 47% of the 241 Creek watershed, with the adjacent 240 Creek watershed serving as an unlogged control.While logging had only a small effect on annual yield (5% increase), the results of all 3 analysis techniques confirmed a dramatic change in the timing and magnitude of April through June streamflow. A paired watershed analysis showed that during the first 7 years post-logging, average April and May water yield increased by 29% and 19%, respectively, while June and July water yield decreased by 23% and 17%, respectively. This pattern of change was confirmed by significant increases in standardised April-May monthly total water yield. Changes in the daily flow duration curves for each month also show a 67% increase in daily yields exceeded ≤10% of the time in April and a 15% increase in May. Daily yields exceeded ≤10% of the time decreased by 24% in June and 17% in July. These streamflow shifts increase the risk of channel destabilization and damage to aquatic habitat during the snowmelt season, and water shortages in the Okanagan region early in the irrigation season (June through July).

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“…The hydrological response data for the calibration and treatment periods are analysed using simple linear regressions (SLRs) (Udawatta et al, ; Ssegane et al, ) to establish relationships between the control and treatment watersheds for the hydrologic response variable. The SLR for calibration and treatment periods are expressed as:

Y_{c} = b_{c} X_{c} + a_{c}

Y_{t} = b_{t} X_{t} + a_{t}

where Y c and Y t are the hydrologic response variables from the treatment watershed during the calibration and treatment periods, respectively; X c and X t are the hydrologic response variables from the control watershed during calibration and treatment periods, respectively; b c and b t are the slopes of the SLR during calibration and treatment periods, respectively; and a c and a t are the intercepts of the SLR during calibration and treatment periods, respectively.…”

Section: Methodsmentioning

confidence: 99%

Quantification of Hydrologic Response of Staggered Contour Trenching for Horti‐pastoral Land Use System in Small Ravine Watersheds: A Paired Watershed Approach

et al. 2016

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A paired watershed approach was used to quantifying the effects of staggered contour trenching (SCT) densities on runoff and soil loss from a long-term field experiment. Four adjacent physiographical similar ravine watersheds were selected. After 2-year calibration period, three of the four watersheds were treated with different SCT densities and leaving one watershed as untreated control (W C ). The SCT densities of 139, 278 and 417 trenches ha À1 were determined based on the targeted 25, 50 and 75% runoff trapping potential of the W T1 , W T2 and W T3 treatment watersheds, respectively. Runoff and soil loss were recorded for a period of 11 years including 2 years of calibration period. The calibration and treatment prediction equations for the treatment watershed with respect to untreated control watershed were developed by the simple linear regression. F-test and t-test (p < 0·0001) suggested that calibration predictions were highly significant and treatment prediction equations differ significantly. Results showed mean runoff reductions of 86·1, 60·5 and 37·7% in the W T3 , W T2 and W T1 treatment watershed over the control, respectively. Similar trends as the runoff were also recorded in soil loss reduction by 124·9, 77·1 and 40·0% for the W T3 , W T2 and W T1 over Wc, respectively. Paired t-test (p < 0·001) indicated that the means of the treatment effects on runoff and soil loss in treatment watersheds differ significantly with control watershed. It was concluded that 417 staggered contour trenches ha À1 is an optimum trenching density for supporting the horti-pastoral land use system in ravine lands of India.

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Consistency of Hydrologic Relationships of a Paired Watershed Approach

Cited by 24 publications

References 50 publications

Calibration of paired watersheds: Utility of moving sums in presence of externalities

Calibration of paired watersheds: Utility of moving sums in presence of externalities

Streamflow response to clear‐cut logging on British Columbia's Okanagan Plateau

Quantification of Hydrologic Response of Staggered Contour Trenching for Horti‐pastoral Land Use System in Small Ravine Watersheds: A Paired Watershed Approach

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