Assessment of non-point source pollution in the vadose zone by Dennis L. Corwin, Keith Loague, Timothy R. Ellsworth

By Dennis L. Corwin, Keith Loague, Timothy R. Ellsworth

Published by means of the yankee Geophysical Union as a part of the Geophysical Monograph sequence, quantity 108.

Non-point resource (NPS) pollutants within the vadose region (simply outlined because the layer of soil extending from the soil floor to the groundwater desk) is an international environmental challenge. commonly, NPS toxins are common and infrequently ubiquitous in quantity, therefore making remediation efforts tough and complicated; have the potential of retaining a comparatively lengthy energetic presence within the international atmosphere; and will bring about long?]term, power well-being results in people and different lifestyles kinds. just like different worldwide environmental concerns, the information and knowledge required to deal with the matter of NPS toxins within the vadose region pass a number of technological and subdisciplinary traces: spatial data, geographic info structures (GIS), hydrology, soil technology, and distant sensing. Cooperation among disciplines and medical societies is key to deal with the matter. proof of such cooperation used to be the together subsidized American Geophysical Union Chapman/Soil technology Society of the USA (SSSA) Outreach convention that happened in October 1997, entitled “Applications of GIS, distant Sensing, Geostatistics, and Solute delivery Modeling to the evaluate of Non-Point resource toxins within the Vadose Zone.” the target of the convention and this booklet, which used to be built from the convention, used to be to discover present multidisciplinary learn for assessing NPS toxins in soil and groundwater resources.

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B. Hudson,I. Porro,andP. J. Wierenga,Modeling one-dimensional infiltration into very dry soils2. Estimationof becomean international priority,WaterScienceTechnology, 28(3-5), 1-11, 1993. the soil water parameters and model predictions, Water ResourcesResearch,25(6), 1271-1282, 1989b. , and M. Nawar, Implementingthe World Bank'swater resourcesmanagementpolicy: A priority on toxic substances Hills, R. , P. J. Wierenga,D. B. Hudson,andM. R. Kirkland,The secondLas CrucesTrenchexperiment:Experimentalresultsand fromnonpointsources,WaterScienceTechnology, 33(4-5), 4551, 1996.

67 ha subcatchmentof the watershed,or the Melton Branch ExperimentalStation (MBES), in a The objectiveof this researchis to numericallyexamine deciduousforest located on the Conasaugaformation the multi-scale effects of physical and chemical mass- [Luxmooreand Abner, 1987]. The strataof theConasauga transferprocesseson watershed-scale, variably-saturated groupweatherto a shallow(< lm) B-horizonsoiloverlying subsurfacecontaminanttransport. Heterogeneityin phys- saprolitethatretainsthebeddingandstructure of theparent icochemicalprocesses, as contrastto heterogeneity in soil limey shalerocks.

Irrigation frequency varied from bi­ daily to every fifth day depending on time of year. The highest level of representation used in the water flow modeling is the one-dimensional Richards equation Data Representations Field-scale simulations are assumed to be limited by data constraints to information available at the 20 sites, which might be scattered within a field of many ha. Four levels of where Sw is the water-extraction sink term. information representation is used, it is coupled with the transient solute are assumed: complete hydraulic property When this characterization from the surface to ground water at each advection-dispersion equation (assuming first order decay, site; water content profiles at each site at four times of the no solute uptake, and no solute adsorption) year; average water-content values (one per site) over the entire period of the leaching event; and average field­ capacity values from the top 1 m of each site.

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