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txspace.tamu.edu 檢索結果共 5447 筆,本頁資料從第 241 筆到第 252 筆

In 1979, nine small forested watersheds were instrumented in East Texas to determine the effect of intensive forest management practices On water quantity and quality. Three replications of three treatments were used: 1) clearcutting - followed by shearing and windrowing, 2) clearcutting - followed by roller chopping and 3) undisturbed control. Following treatment, the....

By A. T. Weichert,W. W. Crawley,J. L. Nieber,W. H. Blackburn,M. G. DeHaven--Texas Water Resources Institute--2007-11-30
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The chief sources of groundwater for the Texas Winter Garden are the Carrizo (Dimmit, Zavala, Frio, and LaSalle Counties) and Edwards (Uvalde County) Aquifers. The major user of groundwater in the region is irrigation. However, insufficient aquifer recharge relative to groundwater use has stimulated interest in alternatives to ease adjustments to diminished groundwater ....

By J. G. Pena,G. C. Cornforth,R. D. Lacewell,G.E. Muncrief--Texas Water Resources Institute--2007-11-30
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The commercial forestlands of East Texas and Louisiana are the most water-efficient producing areas of the two states. Current and projected water shortages for Texas makes this water-rich area extremely important to future growth and development of Texas. However, little is known about the influence of intensive forest practices or livestock grazing on water quality, y....

By W. H. Blackburn,T. K. Hunter,J. P. Dobrowolski,A. T. Weichert--Texas Water Resources Institute--2007-11-30
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Two possible policy alternatives for management of limited water supplies in arid portions of Texas and New Mexico were analyzed for economic feasibility. Detailed studies of the potential impact of a water accumulation policy for each of two irrigation districts (El Paso County Water Improvement District No. 1 in Texas, and the Elephant Butte Irrigation District in New....

By P. W. Teague,G. C. Cornforth,Ronald D. Lacewell,John R. Ellis--Texas Water Resources Institute--2007-11-30
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Water shortages are a common problem in much of the southwest. Increasing urbanization and increasing population places greater demands on dwindling water supplies. Over half of the water used in urban areas of the southwest is used in the irrigation of landscapes. To help cope with increased urban water demands and low water supplies, research was conducted from March ....

By B. Simpson,C. Giordano,B. W. Hip--Texas Water Resources Institute--2007-11-30
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C. E. Jacob received patents in 1965 for a single location well doublet that would produce fresh water overlying salt-water without upconing of the heavier salt-water and pollution of the fresh water zone. No known evaluation of the concept or development of design criteria has been accomplished. In this study, a finite difference radial flow model was developed to dete....

By D. L. Reddell--Texas Water Resources Institute--2007-11-30
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Crop production on the Texas High Plains is constrained by limited and erratic rainfall, hence irrigation is important. Presently, 6 million acres, or 50% of regional cropland, are irrigated annually. Irrigation water is drawn from the Ogallala Aquifer, which has a recharge rate near zero, and is being depleted at the present rate of use. Future crop production is depe....

By J. R. Ellis,R. D. Lacewell,D. R. Reneau--Texas Water Resources Institute--2007-11-30
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This study investigated the economics of an Edwards Aquifer region "dry-year option" buyout directed toward decreasing agricultural water use in an effort to augment springflow. The research involved several phases. First, we applied crop growth simulation models to quantify the expected yield of major crops by weather year for alternative irrigation strategies. Second,....

By Kang Yu,Manzoor Chowdhury,Keith Keplinger,Lonnie L. Jones,Ronald D. Lacewell,Bruce A. McCarl--Texas Water Resources Institute--2007-11-29
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Metal pollution of surface water resources in Texas is a significant problem, and is caused by the inflow of sediments from oil fields, old mines and industrial sites, and by the discharge of metal contaminated sewage and industrial effluents. In the preliminary phases of this project we were interested in a range of contaminant metals; however, following early experime....

By Jianlin Wang,Klaus Raven,Amita Jain,Richard H. Loeppert--Texas Water Resources Institute--2007-11-29
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The evolution of the Water Rights Analysis Package (WRAP) is outlined in the "Model Development Background" section of Chapter 1 of this report. The model was developed in conjunction with a series of university research projects sponsored by the Texas Water Resources Institute, U.S. Geological Survey, Brazos River Authority, Texas Advanced Technology Program, Texas Wat....

By David D. Dunn,Ralph A. Wurbs--Texas Water Resources Institute--2007-11-29
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The exposure of an organism to a toxicant is defined by the magnitude, duration, and frequency with which the organism(s) interact with the toxicant(s). Predicting the exposure of organisms to toxicants during episodic events such as those resulting from storm water runoff is very difficult. The research reported here describes a non-invasive, or minimally invasive, sys....

By F. U. Schwalm,H. J. Allen,Miguel F. Acevedo,W. Tom Waller--Texas Water Resources Institute--2007-11-29
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This report summarizes results from studies to determine relationships among the volume, duration and frequencies of floods in ungaged catchments in Texas. Methodologies were adopted for determining flood volumes at unregulated, non-urban catchments. Separate methodologies were developed for small and large watersheds. Regression equations were developed for twelve regi....

By Juan B. Valdes,Ravi S. Devulapalli--Texas Water Resources Institute--2007-11-29
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