Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Wet periods"”.
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Um modelo markoviano para simulação de vazões diárias
… normal and lognormal distributions. Dry and wet periods of the hydrologic year are observed separately, while simulated series are compared with the corresponding historics in order to point out the best adjustable process for the period under analysis.
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Hillslope and watershed scale hydrological processes and grazing management in a Dartmoor catchment, Southwest England
… in contrast to a more uniform pattern in wet periods. A threshold soil moisture content of about 0.60 cm3 cm-3 divides the two conditions. The exponential relationship between average hillslope soil moisture content and stream discharge also revealed the division between wet and dry …
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Process Modeling of Trihalomethanes During Aquifer Storage and Recovery
… by injecting treated water underground during wet periods and recovering water during dry periods. Trihalomethanes are the most common disinfection by-products found in chlorinated water, a result of chlorine reacting with dissolved organic matter, and are linked to adverse human health …
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Water From a Stone: The Limits of the Sustainable Development of the Texas Edwards Aquifer
… measures to be initiated in advance of critical periods. Conventional drought indices such as the Palmer Drought Severity Index and the Standard Precipitation Index were found to be unreliable indicators of hydrologic drought in the Edwards Aquifer region. Regional drought management plans have …
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A multi-criteria evaluation of land-surface models and application to semi-arid regions
… result in similar performance for many time periods, and there is a need to include wet periods with elevated latent heat to capture the variability of climatic conditions such as the monsoon and El Nino winters. Last, a preliminarily investigation of the performance of the BATS2 model is …
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Muddy memories : environmental change at Hluhluwe Imfolozi Game Reserve, KwaZulu-Natal, South Africa - evidence from diatoms
… lake level act as a proxy for warm/dry or cold/wet periods over time. During the last 240 years lake levels have remained consistently low but nevertheless indicate four alternating periods of cold/wet and warm/dry climate. From c. A.D. 1770 (the last few decades of the Little Ice Age) to the c. …
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Paleosol evolution in a sequence stratigraphic framework, Cretaceous Ferron Notom Delta, south central Utah, U.S.A.
… have been previously thought of as ever wet and poorly developed, and lacking useful paleoenviromental and paleoclimatic indicators. However, a suite of pedogenic features and geochemical attributes of hydromorphic floodplain paleosols of the youngest non-marine (100ka) sequence in the …
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Fire-driven changes to tree drought vulnerability and carbon storage in temperate broadleaf forests
… fires reduced annual growth by 9.2% during wet periods favorable for growth, an effect attributed to an observed 26% decline in soil nitrogen availability with fire. Overall, this research highlights that fire-driven changes to forest structure and nitrogen (N) cycling have important …
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The link between Permeable Interlocking Concrete Pavement (PICP) design and nutrient removal
… period of two years with intermittent dry and wet periods. The influent and effluent from all ten experimental cells were periodically collected and analyzed for pH, temperature, electrical conductivity and the effluent concentrations of ammonia-nitrogen, orthophosphate-phosphorus, …
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Environmental change and human interaction in the western Mediterranean over the long term: a comparative study from Sardinia
… case study. This research targets critical periods of the Holocene within three diverse environmental settings as case studies, using micromorphological and geochemical data from off-site sediment cores, as independent indicators of palaeoclimate conditions, and geomorphological and …
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Assessing the Cost and Operational Feasibility of "Green" Hardwood Winter Inventory for Southeastern Pulp Mills
… pulpwood in woodyards for retrieval during wet weather. Hardwood fiber readily available in large volumes on ground that is operable during wet periods at a location near the pulp mill could provide a valuable alternative wood source. Thus, the objectives of this study are to 1) develop a …
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Fire, climate, and forest structure in ponderosa pine forests of the Black Hills
… from 1770 to 1805. Cohorts established during wet periods in the northern Great Plains. Extended wet conditions likely promoted abundant tree regeneration, fast growth, and longer periods between surface fires that would have permitted more trees to reach canopy status, therefore becoming more …
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Corrosion of steel in the marine splash-zone.
… to be higher for specimens exposed to initially wet conditions though high temperatures were found to correlate with high corrosion rates of thickly-scaled steels. Scales became compact and resistant to cathodic reduction as exposure times increased but corrosion rates tended to increase with …
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The influence of various factors on the results of carbonation, cover depth, half-cell potential and resistivity tests that are used in the assessment of reinforcement corrosion
… August and November 2018 during both dry and wet periods and on days with different temperatures. This was done to assess how changing weather conditions can affect the test results. The results from these tests were also used to do a comparison between HCP and cover depth results and HCP and …
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A Dynamic Risk Management Framework for Water and Environmental Sustainability
… of water availability from prolonged dry periods to prolonged wet periods. Ensuring reliability of water supply under these hydrological regime shifts involves understanding how these regime shifts can be identified, characterized, and quantified. This dissertation describes a dynamic risk …
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Terrestrial Water Storage Change Over Dryland Regions Using Observational Data and Model Simulations
… to varying aridity conditions. During dry periods, TWS depletes sharply, mainly caused by rapid responses of plant transpiration (T) through root water uptake of subsurface water. However, TWS recovers slowly during wet periods due to the evaporative loss from the wetted surface soils. This …
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Moisture transport associated with the summertime North American monsoon.
… North America are examined for the July-August wet season. Vertically-integrated fluxes and flux divergences of water vapor are computed for the 8 summers, 1985-1992, from ECMWF mandatory-level analyses possessing a spectral resolution of triangular 106 (T106). The intraseasonal variability of …
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Monitoring Drought at river basin and regional scale: application in Sicily
… related to historical droughts, as well as to wet periods, has indicated the feasibility of the developed tool, both to characterize past droughts, as well as to probabilistically assess the magnitude of an ongoing drought for monitoring purposes.
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1300 Years of Snowpack Change for the Sangre de Cristo Mountian Range
… yet, the historic record depicts extended periods of drought which eclipse, in terms of both persistence and intensity, those revealed over the instrumental period.</p> <p>Based on one event classification scheme, an ongoing drought event (2011–17) ranks third in overall intensity behind …
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