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Page 452, results 11276 - 11300

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A spatial simulation model of hydrology and vegetation dynamics in semi-permanent prairie wetlands
Karen A. Poiani, W. Carter Johnson
1993, Ecological Applications (3) 279-293
The objective of this study was to construct a spatial simulation model of the vegetation dynamics in semi-permanent prairie wetlands. A hydrologic submodel estimated water levels based on precipitation, runoff, and potential evapotranspiration. A vegetation submodel calculated the amount and distribution of emergent cover and open water using a geographic...
Comparison of Penman-Monteith, Shuttleworth-Wallace, and modified Priestley-Taylor evapotranspiration models for wildland vegetation in semiarid rangeland
David I. Stannard
1993, Water Resources Research (29) 1379-1392
Eddy correlation measurements of sensible and latent heat flux are used with measurements of net radiation, soil heat flux, and other micrometeorological variables to develop the Penman-Monteith, Shuttleworth-Wallace, and modified Priestley-Taylor evapotranspiration models for use in a sparsely vegetated, semiarid rangeland. The Penman-Monteith model, a one-component model designed for use...
Sampling colloids and colloid-associated contaminants in ground water
Debera A. Backhus, Joseph N. Ryan, Daniel M. Groher, John K. MacFarlane, Philip M. Gschwend
1993, Groundwater (31) 466-479
It has recently been recognized that mobile colloids may affect the transport of contaminants in ground water. To determine the significance of this process, knowledge of both the total mobile load (dissolved + colloid-associated) and the dissolved concentration of a ground-water contaminant must be obtained. Additional information regarding mobile colloid...
Wetland modeling and information needs at Stillwater National Wildlife Refuge
David B. Hamilton, Gregor T. Auble
1993, Report, Results of a workshop sponsored by Division on Wildlife Refuges and Wildlife, Region 1
The marshes in and around Stillwater National Wildlife Refuge (the Refuge) are extremely dynamic; expanding and contracting in size both seasonally, due to runoff and subsequent evapotranspiration, and over longer periods, due to climatic variation. The dynamic nature of these marshes results in a diversity of wetland habitats, which...
Confirmation of rate-dependent behavior in water retention during drainage in nonswelling porous materials
Jim Constantz
1993, Water Resources Research (29) 1331-1334
In the water retention process in porous material, changes in water content are assumed to be independent of the rate at which the matric potential varies. Periodically, researchers have presented results that do not support this assumption, indicating that water retention may be rate-dependent under certain conditions. In the present...
Restoration of lowland streams: an introduction
L.L. Osborne, P.B. Bayley, L.W.G. Higler, B. Statzner, F. Triska, T. Moth Iverson
1993, Freshwater Biology (29) 187-194
This paper introduces the Lowland Streams Restoration Workshop that was held in Lund, Sweden in August 1991.Attenders at the Workshop participated in working groups which discussed and reported on the state of knowledge of stream restoration and identified critical areas of information need. Currently, most restoration efforts are emission‐orientated (i.e....
Differentiation of volcanic ash-fall and water-borne detrital layers in the Eocene Senakin coal bed, Tanjung Formation, Indonesia
Leslie F. Ruppert, T.A. Moore
1993, Organic Geochemistry (20) 233-247
The Sangsang deposit of the Eocene Senakin coal bed, Tanjung Formation, southeastern Kalimantan, Indonesia, contains 11 layers, which are thin (<5 cm) and high in ash (> 70%). These layers are characterized by their pelitic macroscopic texture. Examination of eight of the layers by scanning-electron microscopy, energy-dispersive X-ray, and X-ray...
Options for water-level control in developed wetlands
J. R. Kelley Jr., M. K. Laubhan, F. A. Reid, J. S. Wortham, L. H. Fredrickson
1993, Book chapter, Waterfowl management handbook
Wetland habitats in the United States currently are lost at a rate of 260,000 acres/year (105,218 ha/year). Consequently, water birds concentrate in fewer and smaller areas. Such concentrations may deplete food supplies and influence behavior, physiology, and survival. Continued losses increase the importance of sound management of...
Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California
Ronald S. Oremland, Laurence G. Miller, Charles Colbertson, S.W. Robinson, Richard L. Smith, Derek R. Lovley, Michael J. Whiticar, G. King, Ronald P. Kiene, Niels Iversen, Melinda Sargent
R. Oremland, editor(s)
1993, Book chapter, Biogeochemistry of global change
Above-ambient levels of methane and higher hydrocarbons were detected in the atmosphere of the Mono Basin. These gases emanated from several different sources, including natural gas seeps (thermogenic and biogenic), and methanogenic activity in sediments. Seeps were distributed over nearly 33% of the lake bottom and were also present...
Geochemical models
David L. Parkhurst, L.N. Plummer
William M. Alley, editor(s)
1993, Book chapter, Regional ground-water quality
No abstract available. ...
Natural radionuclides
D. Kirk Nordstrom, Richard B. Wanty
W.M. Alley, editor(s)
1993, Book chapter, Regional ground-water quality
No abstract available....
Modelling within the stream-catchment continuum
Kenneth E. Bencala, John H. Duff, Judson W. Harvey, A. P. Jackman, F.J. Triska
A.J. Jakeman, M. Beck, Ryan J. McAleer, editor(s)
1993, Book chapter, Modeling change in environmental systems
No abstract available....
Assessing the effect of pesticides in agricultural runoff on aquatic life in the Sangamon River near Monticello, Illinois
R.H. Coupe, M.S. Henebry, M.R. Branham
H. Olem, editor(s)
1993, Water Science and Technology (28) 569-573
Stream-water samples collected from a midwest stream, following a thunderstorm during May 1991 were toxic to water fleas (Ceriodaphnia dubia), but not fathead minnows (Pimephales promelas), or a bacterium (Photobacterium phosphoreum) or green alga (Selenastrum capricornutum). It was unlikely that the toxicity to the water fleas was caused by herbicides,...