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The Effects Of High And Low Hydraulic Drain Head On Water Quality From Rice In Peat Soil
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Book Synopsis The Effects of High and Low Hydraulic Drain Head on Water Quality from Rice in Peat Soil by : Joseph Gallucci
Download or read book The Effects of High and Low Hydraulic Drain Head on Water Quality from Rice in Peat Soil written by Joseph Gallucci and published by . This book was released on 2006 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Evaluation of Rice Straw as a Possible Material for Subsidence Reversal by : Ian Stanford Bay
Download or read book The Evaluation of Rice Straw as a Possible Material for Subsidence Reversal written by Ian Stanford Bay and published by . This book was released on 2008 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Peat Mining on Fish and Other Aquatic Organisms in the Upper Midwest by : Camp, Dresser & McKee. Environmental Sciences Division
Download or read book Effect of Peat Mining on Fish and Other Aquatic Organisms in the Upper Midwest written by Camp, Dresser & McKee. Environmental Sciences Division and published by . This book was released on 1981 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Interrelation of Water Quality and Compaction Upon the Hydraulic Conductivity of Hesperia Sandy Loam Soil by : Brooke Eltinger Sawyer
Download or read book The Interrelation of Water Quality and Compaction Upon the Hydraulic Conductivity of Hesperia Sandy Loam Soil written by Brooke Eltinger Sawyer and published by . This book was released on 1960 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydraulic Conductivity and Water Retention in Peat Soils by : Juhani Päivänen
Download or read book Hydraulic Conductivity and Water Retention in Peat Soils written by Juhani Päivänen and published by . This book was released on 1973 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seloste: Turpeen vedenläpäisevyys ja vedenpidätyskyky.
Book Synopsis Water Management in Irrigated Rice by : B. A. M. Bouman
Download or read book Water Management in Irrigated Rice written by B. A. M. Bouman and published by Int. Rice Res. Inst.. This book was released on 2007 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Diagnosis and Improvement of Saline and Alkali Soils by : L. E. Allison
Download or read book Diagnosis and Improvement of Saline and Alkali Soils written by L. E. Allison and published by . This book was released on 1969 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Peat Extraction on Water Quality by : I. D. Codling
Download or read book The Effects of Peat Extraction on Water Quality written by I. D. Codling and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Boreal Peatland Ecosystems by : R.K. Wieder
Download or read book Boreal Peatland Ecosystems written by R.K. Wieder and published by Springer Science & Business Media. This book was released on 2006-10-16 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first truly ecosystem-oriented book on peatlands. It adopts an ecosystems approach to understanding the world's boreal peatlands. The focus is on biogeochemical patterns and processes, production, decomposition, and peat accumulation, and it provides additional information on animal and fungal diversity. A recurring theme is the legacy of boreal peatlands as impressive accumulators of carbon as peat over millennia.
Author :International Rice Research Institute Publisher :Int. Rice Res. Inst. ISBN 13 :9711041464 Total Pages :438 pages Book Rating :4.7/5 (11 download)
Book Synopsis Soil Physics and Rice by : International Rice Research Institute
Download or read book Soil Physics and Rice written by International Rice Research Institute and published by Int. Rice Res. Inst.. This book was released on 1985 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Peat Harvesting on Down Stream Water Quality by : Linda A. Halsey
Download or read book The Effects of Peat Harvesting on Down Stream Water Quality written by Linda A. Halsey and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Final Report on Experiment #2 by : Marvin Jung
Download or read book Final Report on Experiment #2 written by Marvin Jung and published by . This book was released on 2000 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Agriculture with Subject Index by :
Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1994 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Hydrology of Peat by : David William Rycroft
Download or read book On the Hydrology of Peat written by David William Rycroft and published by . This book was released on 1971 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Variability of Water Quality and Rice Growth in Rusurirwamujyinga by : Albert Ruhakana
Download or read book Variability of Water Quality and Rice Growth in Rusurirwamujyinga written by Albert Ruhakana and published by LAP Lambert Academic Publishing. This book was released on 2015-12-11 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: The water quality used for irrigation is essential for the yield and quantity of crops, maintenance of soil productivity, and protection of the environment. Irrigation water quality has a profound effect on soil and plant health. A major concern with water used for irrigation is the decreased of the crop yields and land degradation as a result of poor water and soil management which lead to irrigation induced problems, such as salinity and water-logging capacity. Rusurirwamujyinga rice irrigation scheme in Rwanda was subjected to a study of its water quality and its response on growth of rice. The aim of this study was to assess spatial and temporal water quality variability and its response on growth of irrigated rice in Rusurirwamujyinga sub-catchment.
Book Synopsis Effect of Irrigation Water Quality on Soil-rice Interrelationships by : K. S. Murthy
Download or read book Effect of Irrigation Water Quality on Soil-rice Interrelationships written by K. S. Murthy and published by . This book was released on 1989 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterizing the Transport of Hydrocarbon Contaminants in Peat Soils and Peatlands by : Behrad Gharedaghloo
Download or read book Characterizing the Transport of Hydrocarbon Contaminants in Peat Soils and Peatlands written by Behrad Gharedaghloo and published by . This book was released on 2018 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Widespread transportation corridors crossing Canadian peatlands make these landscapes vulnerable to hydrocarbon spills. After a spill happens, free hydrocarbon spreads in the peat layer forming a free-phase plume. Water soluble compounds of the free-phase plume then partition into the pore water and the flowing aqueous phase forming a dissolved-phase plume. These plumes threaten peatland ecosystem health and impose risk to aquatic systems located nearby the contaminated area. For this reason, environmental scientists should be able to predict the behavior of hydrocarbon contaminants and the temporal evolution of the hydrocarbon plumes. Properties of peat soils control the fate and transport of the spilled non-aqueous phase liquids (NAPL) and dissolved-phase hydrocarbon solutes in contaminated peatlands. Since the fate and transport of these contaminants in peat has received little attention, there is insufficient knowledge of parameters governing their mobility. The cumulative effect of processes including dissolution, advection, and dispersion, diffusion into immobile water, adsorption onto soil matrix, volatilization, biodegradation, and other transformation processes determines the temporal evolution of contaminants in aquifers. The physical, hydraulic, and chemical properties of the aquifer soil and the hydrological, thermal, biological, and geochemical characteristics of the aquifer determine the rates and the relative dominance of abovementioned processes. It is well established that peat physical and hydraulic properties including its porosity, hydraulic conductivity, and average pore radius size vary systematically with peat depth. Also, peat decomposition and humification modifies the chemical composition of the peat matrix. However, the effect such systematic variations in peat has on the redistribution of hydrocarbon contaminants has not been investigated. Multiphase flow characteristics of peat including capillary pressure-saturation-relative permeability (Pc-S-kr) relations control the redistribution of free-phase hydrocarbon in a peatland. These relations will be functions of peat type and its physical properties. The functionality of Pc-S-kr relations and residual NAPL (diesel) saturation (SNr) with peat type were examined in two types of peat in which SNr ranged between 0.3-17% and increased with peat bulk density. In a given peat, SNr was a function of saturation history and increased with increasing maximum diesel saturation. Irreducible water saturation, which is the saturation at which aqueous phase stops moving, and the curvature of water kr-S curves both were a function of peat type, and increased with peat bulk density. The results suggested that the kr-S relations of water derived from unsaturated hydraulic conductivity of peat (in the presence of air) might be a good estimate of the water kr-S relation in presence of NAPL. Although the functionality Pc-S-kr relations to peat depth was not determined in this study, conceptually, it is expected that the reduction of pore radius typically taking place down the peat profile leads to 1) reduction of peat hydraulic conductivity with depth, 2) increase in NAPL-entry capillary pressure and water retention with depth, which cumulatively could cause a preferential migration of NAPL in shallower peat layers after a pressurized release of NAPL. In this condition, the exchange of gases between the source zone and the atmosphere happening due to wind or water table fluctuations may efficiently 1) drain contaminated soil-gas, and 2) promote aerobic conditions in the contaminated area. The water table fluctuation, however, might enhance the lateral redistribution of the free-phase plume. The retardation of dissolved hydrocarbons is dominantly controlled by their adsorption onto the soil. The adsorption of benzene and toluene, as two of the most toxic and mobile dissolved organic compounds present in petroleum liquids, and their dependency on peat depth were explored. The linear adsorption isotherms for benzene and toluene were obtained with adsorption coefficients ranging from 16.2-48.7 L/kg and 31.6-48.7 L/kg, respectively. In the experiments, the benzene and toluene adsorption coefficients were not constant along the peat profile and varied with peat depth. The variations of toluene adsorption correlated with typical variations of cellulose and humic acid characteristic of a peat matrix. The organic carbon adsorption coefficient (KOC) obtained for benzene in peat was equal and higher than the average benzene KOC reported in literature for soils with low organic carbon content (fOC). However, toluene KOC was 10-50% less than the average value which suggests that using the average value might overestimate toluene retardation and underestimate its mobility down-gradient of the spill zone. The competition between benzene and toluene adsorption was insignificant, suggesting that individual adsorption coefficients could be used to study the adsorption of individual contaminants in a multi-solute problem. The adsorption studies showed adsorption of benzene and toluene at the equilibrium condition. However, the adsorption model parameters that control the chemical equilibrium during contaminant transport remained unknown. Besides, the effect of mobile-immobile mass transfer, which takes place due to the dual-porosity pore structure of peat, on the retardation of dissolved hydrocarbons in the inactive pores, were not known. To address these, miscible (solute) transport experiments were conducted showing that the mass transfer rate between mobile and immobile zones of peat could be sufficiently high to establish physical-equilibrium between mobile and immobile zones of peat pore space. The results also showed that the relatively slow kinetics of adsorption could cause chemical non-equilibrium between the aqueous phase and adsorbed phase, leading to decreased adsorptive retardation in high discharge conditions. The retardation factor of benzene increased with depth and degree of peat decomposition. This coupled with the typical reduction of hydraulic conductivity with depth could cause a preferential redistribution of dissolved-contaminants in shallow peat layers in a contaminated peatland. This study is the first study that characterizes the fate and transport of hydrocarbon contaminants in peat at the laboratory-scale and with specific focus on peat properties. Although scale-dependent phenomena such as field-scale heterogeneities might impose additional complexities to the fate and transport processes, the scale-independent parameters obtained in this study including adsorption partitioning coefficients and adsorption kinetics parameters, as well as residual NAPL saturation, irreducible water saturation, and water relative permeability relations have increased our understanding on the transport of free-phase and dissolved-phase hydrocarbons in in peat. The results can help predict the temporal evolution of the hydrocarbon plumes after a spill. The results also can help in assessing the risk after an oil spill accident and for evaluating the appropriateness of potential remediation plans.