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.
Results
Showing 1 to 20 of 25 for “"Dry spells"”.
-
The influence of the Indian and Atlantic Oceans on wet and dry spells over southern Tanzania
… warm/cold ENSO events would impact both a wet or dry year. Such contradiction has imposed a challenge to the forecasters of seasonal rainfall over southern Tanzania.
-
An investigation into dry and wet spell characteristics over Zambia and into the onset of the rainy season
Recurring dry/wet spells and decreased agricultural productivity during the last decade in the southern and northern parts of Zambia point to the need for a clearer understanding of these events, their frequencies and their possible connection to large-scale climate modes. Apart from having a high …
-
Hydrological Drought - a Study across Europe
… of the space-time characteristics of the major dry spells in Europe in 1962-90. Regions such as Spain, SE-UK, S-Scandinavia and N-Germany show a tendency to persistent dry spells while the index fluctuates more strongly in other regions. <br>Anomalies of atmospheric circulation patterns …
-
An investigation of the impacts of intra-seasonal rainfall variability on the maize growing season in Limpopo Province, South Africa from 1990-2014
… such as onset, cessation and wet and dry spells threatens maize yields in Southern Africa. Previous studies have focused on the impacts of seasonal rainfall totals on maize yields. The aim of this study is to investigate the impacts of intra-seasonal rainfall variability on the maize …
-
Mechanisms for the wet and dry years over Eritrea during the summer rainfall season
… The investigation mainly concentrates on wet and dry spells that occurred over Eritrea during the rainy seasons (June to August) of 1950's-1990's. Rainfall data was available from the Climatic Research Unit (CRU) Hulme dataset for a period of 1950 -1996 and this together with rainfall data from …
-
An analysis of rainy season characteristics over the Limpopo region
… investigated are the frequency of wet and dry spells during the rainy season and the onset date of the season.
-
Lie Analysis for Partial Differential Equations in Finance
… of rainfall intensity as well as duration of dry spells. By using the Feynman-Kac theorem and the rainfall indexes we derive the partial differential equations (PDEs) that governs the price of an European option. We apply the Lie analysis theory to solve the PDEs, we provide the group …
-
Some Statistical Analyses of the Climate of Nacogdoches, Texas for Applications in Natural Resources Management
… and 65.5°F, respectively. The summer is warm and dry with mean maximum temperature of 91.6°F while winter is mild with mean minimum temperature of 38°F. There were no statistical differences between mean annual temperature and precipitation on the 1951-80 and 1901-80 periods or between any 2 …
-
Where birds are rare or fill the air : the protection of the endemic and the nomadic avifaunas of the Karoo
… timing. The variability of the rainfall and long dry spells or severe droughts create a mosaic so that high and low resource areas occur as patches in the landscape. Resident species of birds tend to maintain low densities and wait for rainfall events, whereas nomadic species search for high …
-
The influence of rainfall variability on savanna tree seedling establishment
… from a field drought experiment showed that dry season survival for seedlings of Acacia nigrescens and Philenaptera vialacea was not related to wet season length. Instead mortality was highest immediately after germination despite irrigation to minimize dry spells. Furthermore there was no …
-
Prolegomenon to an investigation of inhibition in design
… design might do much in the way of eliminating dry spells at the drawing board, I propose that inhibition is not always a negative quantity. My approach to this inquiry has been to identify common ground among play, design, and inhibition at the theoretical level and then to attempt to apply …
-
Understanding the Role of Vegetation Dynamics and Anthropogenic induced Changes on the Terrestrial Water Cycle
… of LCC and irrigation indicated a significant drying over the CONUS, with increased duration and decreased intensity of dry spells, and reduced duration, frequency, and intensity of wet spells. Irrigated cropland areas will become drier due to the added effect of low-precipitation wet spells …
-
Climatic trends and soil moisture feedbacks over Zimbabwe
… moisture conditions during an extreme wet and dry seasons using RegCM3. Finally, some radiation effects results are presented from these soil moisture perturbations experiments. Results show drying out patterns over the region from the historical records analysed. The trend analysis done with …
-
INTEGRATED WATER RESOURCES ASSESSMENT AND MANAGEMENT IN A DROUGHT-PRONE WATERSHED IN THE ETHIOPIAN HIGHLANDS
… maresha tillage to mitigate impact of dry spells on crops and to protect the soil. Tillage performance varied with seasonal rainfall distribution and intensity and land gradient. Ridges significantly increased soil moisture and grain yield and reduced soil loss. Subsoiling moderately …
-
Spatial and temporal variation in precipitation pattern
… focused on extreme precipitation and extreme dry days as well as timing of precipitation. In this study the focus is on change in precipitation probability and persistence of wet days and dry spells over contiguous US and south Canada. There is a paucity of empirical evidence for this study. …
-
Interactions between Atmospheric Deep Convection and the Surrounding Environment
… equilibria (attained when initialized with a dry atmosphere). However, I also find that soil moisture feedbacks—a distinctive feature of land surfaces—can destabilize non-precipitating equilibria when uneven surface drying produces spatial soil moisture gradients. This negative soil …
-
Vegetation feedback on the boundary layer climate of South Africa
… high evaporative losses during the intervening dry spells. Since vegetation-rainfall interactions can be a result of moisture convergence, surface evapotranspiration, or convection, this study focuses on the vertical moisture flux from the land surface and attempts to separate this from the …
-
Assessing dry spell and wet day frequencies over southern Africa during the summer rainy season
… rainfall is better characterised by wet and dry events occurring within rainy seasons as knowledge of the frequency of such events is able to inform agricultural activity. Dry spells (pentads having <5 mm) and moderate wet days (10-30 mm) over southern Africa were assessed using high …
-
Event characteristics of intra-seasonal climate circulations
… with the outer quintiles representing wet and dry conditions. The general circulation in tenns of atmospheric state (humidity and temperature), moisture and heat transport, and energy exchange - with attention to tropical-extratropical cloud-bands, are central to wet seasons in South Africa. …
-
An assessment of the smal-holder enterprise group (SHEG) programme: A case study of Kafue District
… adequate rainfall, but sometimes experiences dry spells as has been the case in the past few years when drought conditions significantly reduced crop yields. The main occupation is farming and that maize is the main food crop.In order to come up with information on this assessment, the study …
Page 1 of 2