Filters: Tags: Preferential Flow (X)25 results (1.5s)
Infiltration and hydraulic connections from the Niagara River to a fractured-dolomite aquifer in Niagara Falls, New York
Geochemical evidence of preferential flow of water through fractures in unsaturated tuff, Apache Leap, Arizona
Flow and transport in fractured tuff at Yucca Mountain: numerical experiments on fast preferential flow mechanisms
Not all water becomes wine: Sulfur inputs as an opportune tracer of hydrochemical losses from vineyards
California's widespread and economically important vineyards offer substantial opportunities to understand the interface between hydrology and biogeochemistry in agricultural soils. The common use of native sulfur (S) as a fumigant or soil additive provides a novel way to isotopically differentiate among sulfate (SO4 2−) pools, allowing the estimation of water and SO4 2− budgets. The objectives of this study were (1) to characterize the near-surface hydrological flow paths in a vineyard during irrigation and storm events and (2) to determine how those flow paths affect the fate and transport of SO4 2− across seasons. Integrating hydrological theory with measurements of SO4 2− concentration and sulfate-S isotopic...
In contrast with the extreme variability expected for water and contaminant fluxes in the unsaturated zone, evidence from 64 field tests of preferential flow indicates that the maximum transport speed V max, adjusted for episodicity of infiltration, deviates little from a geometric mean of 13 m/d. A model based on constant-speed travel during infiltration pulses of actual or estimated duration can predict V max with approximate order-of-magnitude accuracy, irrespective of medium or travel distance, thereby facilitating such problems as the prediction of worst-case contaminant traveltimes. The lesser variability suggests that preferential flow is subject to rate-limiting mechanisms analogous to those that impose...