Estimates of deep percolation beneath cotton in the Macquarie Valley

Willis, TM; Black, A. S.; Meyer, Wayne S.

doi:10.1007/s002710050032

Cited by 53 publications

(33 citation statements)

References 19 publications

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“…Hydrologic budgets of irrigated river valleys reveal that a large percentage of total water diverted for irrigation seeps from canals and percolates below the plant rooting zone. For example, studies indicate that typical canal losses range from 16% to 43% of channel flow [13][14][15], and percolation rates below crop rooting zones as a percentage of irrigation water applied range from less than 23% to 60% or more [16][17][18][19]. Unlike evapotranspiration losses that take water out of the system and preclude future use, canal seepage and field percolation perform the important function of recharging groundwater as demonstrated with hydrodynamic, chemical, stable isotope, and simulation modeling approaches [19][20][21][22][23][24][25].…”

Section: Hydrologic Connections Between Acequia Irrigation Systems Amentioning

confidence: 99%

Modeling Sustainability of Water, Environment, Livelihood, and Culture in Traditional Irrigation Communities and Their Linked Watersheds

et al. 2012

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Water scarcity, land use conversion and cultural and ecosystem changes threaten the way of life for traditional irrigation communities of the semi-arid southwestern United States. Traditions are strong, yet potential upheaval is great in these communities that rely on acequia irrigation systems. Acequias are ancient ditch systems brought from the Iberian Peninsula to the New World over 400 years ago; they are simultaneously gravity flow water delivery systems and shared water governance institutions. Acequias have survived periods of drought and external shocks from changing economics, demographics, and OPEN ACCESSSustainability 2012, 4 2999 resource uses. Now, climate change and urbanization threaten water availability, ecosystem functions, and the acequia communities themselves. Do past adaptive practices hold the key to future sustainability, or are new strategies required? To explore this issue we translated disciplinary understanding into a uniform format of causal loop diagrams to conceptualize the subsystems of the entire acequia-based human-natural system. Four subsystems are identified in this study: hydrology, ecosystem, land use/economics, and sociocultural. Important linkages between subsystems were revealed as well as variables indicating community cohesion (e.g., total irrigated land, intensity of upland grazing, mutualism). Ongoing work will test the conceptualizations with field data and modeling exercises to capture tipping points for non-sustainability and thresholds for sustainable water use and community longevity.

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Section: Hydrologic Connections Between Acequia Irrigation Systems Amentioning

confidence: 99%

Modeling Sustainability of Water, Environment, Livelihood, and Culture in Traditional Irrigation Communities and Their Linked Watersheds

et al. 2012

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“…Although this method is not the most efficient means of water delivery, it helps prevent soil salinization in the crop root zone since addition of sufficient water induces deep percolation. Deep percolation rate can be estimated directly by the Darcian flux calculation method if estimates of in situ soil water potential profiles are available, e.g., by water balance or chloride mass balance modeling [38] . Empirical formulas relating to root zone water storage and to field capacity can also be used [39] .…”

Section: Percolation/phreatic Evaporation-water Exchange Between Satumentioning

confidence: 99%

Modeling of hydrological processes in arid agricultural regions

Li¹,

Mao²,

Kang³

et al. 2015

Front. Agr. Sci. Eng.

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Understanding of hydrological processes, including consideration of interactions between vegetation growth and water transfer in the root zone, underpins efficient use of water resources in arid-zone agriculture. Water transfers take place in the soil-plant-atmosphere continuum, and include groundwater dynamics, unsaturated zone flow, evaporation/transpiration from vegetated/ bare soil and surface water, agricultural canal/surface water flow and seepage, and well pumping. Models can be categorized into three classes: (1) regional distributed hydrological models with various land uses, (2) groundwater-soil-plant-atmosphere continuum models that neglect lateral water fluxes, and (3) coupled models with groundwater flow and unsaturated zone water dynamics. This review highlights, in addition, future research challenges in modeling arid-zone agricultural systems, e.g., to effectively assimilate data from remote sensing, and to fully reflect climate change effects at various model scales.

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“…On the other hand, the determination of soil water flow by K(θ) was unsatisfactory in some studies (Willis et al, 1997;Selle et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Water percolation estimated with time domain reflectometry (TDR) in drainage lysimeters

Silva

Coelho

2013

Rev. Bras. Ciênc. Solo

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SUMMARYDue to the difficulty of estimating water percolation in unsaturated soils, the purpose of this study was to estimate water percolation based on time-domain reflectometry (TDR). In two drainage lysimeters with different soil textures TDR probes were installed, forming a water monitoring system consisting of different numbers of probes. The soils were saturated and covered with plastic to prevent evaporation. Tests of internal drainage were carried out using a TDR 100 unit with constant dielectric readings (every 15 min). To test the consistency of TDRestimated percolation levels in comparison with the observed leachate levels in the drainage lysimeters, the combined null hypothesis was tested at 5 % probability. A higher number of probes in the water monitoring system resulted in an approximation of the percolation levels estimated from TDR-based moisture data to the levels measured by lysimeters. The definition of the number of probes required for water monitoring to estimate water percolation by TDR depends on the soil physical properties. For sandy clay soils, three batteries with four probes installed at depths of 0.20, 0.40, 0.60, and 0.80 m, at a distance of 0.20, 0.40 and 0.6 m from the center of lysimeters were sufficient to estimate percolation levels equivalent to the observed. In the sandy loam soils, the observed and predicted percolation levels were not equivalent even when using four batteries with four probes each, at depths of 0.20, 0.40, 0.60, and 0.80 m.

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Estimates of deep percolation beneath cotton in the Macquarie Valley

Cited by 53 publications

References 19 publications

Modeling Sustainability of Water, Environment, Livelihood, and Culture in Traditional Irrigation Communities and Their Linked Watersheds

Modeling Sustainability of Water, Environment, Livelihood, and Culture in Traditional Irrigation Communities and Their Linked Watersheds

Modeling of hydrological processes in arid agricultural regions

Water percolation estimated with time domain reflectometry (TDR) in drainage lysimeters

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