Item talk:Q299774

{

 "USGS Publications Warehouse": {
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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Percolation and transport in a sandy soil under a natural hydraulic gradient",
   "identifier": [
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse IndexID",
       "value": "70027828",
       "url": "https://pubs.usgs.gov/publication/70027828"
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       "value": 70027828
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       "value": "10.1029/2005WR004061",
       "url": "https://doi.org/10.1029/2005WR004061"
     }
   ],
   "journal": {
     "@type": "Periodical",
     "name": "Water Resources Research",
     "volumeNumber": "41",
     "issueNumber": "10"
   },
   "inLanguage": "en",
   "isPartOf": [
     {
       "@type": "CreativeWorkSeries",
       "name": "Water Resources Research"
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   ],
   "datePublished": "2005",
   "dateModified": "2018-10-31",
   "abstract": "Unsaturated flow and transport under a natural hydraulic gradient in a Mediterranean climate were investigated with a field tracer experiment combined with laboratory analyses and numerical modeling. Bromide was applied to the surface of a sandy soil during the dry season. During the subsequent rainy season, repeated sediment sampling tracked the movement of bromide through the profile. Analysis of data on moisture content, matric pressure, unsaturated hydraulic conductivity, bulk density, and soil texture and structure provides insights into parameterization and use of the advective\u2010dispersive modeling approach. Capturing the gross features of tracer and moisture movement with model simulations required an order\u2010of\u2010magnitude increase in laboratory\u2010measured hydraulic conductivity. Wetting curve characteristics better represented field results, calling into question the routine estimation of hydraulic characteristics based only on drying conditions. Measured increases in profile moisture exceeded cumulative precipitation in early winter, indicating that gains from dew drip can exceed losses from evapotranspiration during periods of heavy (\u201cTule\u201d) fog. A single\u2010continuum advective\u2010dispersive modeling approach could not reproduce a peak of bromide that was retained near the soil surface for over 3 years. Modeling of this feature required slow exchange of solute at a transfer rate of 0.5\u20131 \u00d7 10\u22124\u00a0d\u22121\u00a0with an immobile volume approaching the residual moisture content.",
   "description": "W10414; 17 p.",
   "publisher": {
     "@type": "Organization",
     "name": "American Geophysical Union"
   },
   "author": [
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       "name": "Schulz, Marjorie S. mschulz@usgs.gov",
       "givenName": "Marjorie S.",
       "familyName": "Schulz",
       "email": "mschulz@usgs.gov",
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         "value": "0000-0001-5597-6447",
         "url": "https://orcid.org/0000-0001-5597-6447"
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           "name": "Geology, Minerals, Energy, and Geophysics Science Center",
           "url": "https://www.usgs.gov/centers/gmeg"
         },
         {
           "@type": "Organization",
           "name": "National Research Program - Western Branch",
           "url": "https://www.usgs.gov/centers/arizona-water-science-center"
         }
       ]
     },
     {
       "@type": "Person",
       "name": "Green, Christopher T. ctgreen@usgs.gov",
       "givenName": "Christopher T.",
       "familyName": "Green",
       "email": "ctgreen@usgs.gov",
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           "name": "National Research Program - Western Branch",
           "url": "https://www.usgs.gov/centers/arizona-water-science-center"
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     },
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       "@type": "Person",
       "name": "Stonestrom, David A. dastones@usgs.gov",
       "givenName": "David A.",
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       "name": "Bekins, Barbara A. babekins@usgs.gov",
       "givenName": "Barbara A.",
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         "value": "0000-0002-1411-6018",
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           "@type": "Organization",
           "name": "Hydro-Ecological Interactions Branch",
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         {
           "@type": "Organization",
           "name": "National Research Program - Western Branch",
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           "name": "National Research Program - Eastern Branch",
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       "@type": "Person",
       "name": "Akstin, Katherine C.",
       "givenName": "Katherine C.",
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   "funder": [
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       "name": "Toxic Substances Hydrology Program",
       "url": null
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}