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    Wyświetlanie 1-3 z 3
    Tytuł:
    Rainfall Variability in the wet-dry seasons. An analysis in Batticaloa District, Sri Lanka
    Autorzy:
    Mathanraj, S.
    Kaleel, M. I. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1118352.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Flood
    Meteorology
    Rainfall variability
    Wet-dry
    Opis:
    Rainfall is of primary importance to both the physical and cultural landscape of any region. The objective of this study is to find the trends for rainfall variability on climate change in Batticaloa District of Sri Lanka, by analyzing 146 years of monthly data of rainfall received during the period 1869-2014 from the meteorological station of the Department of Meteorology. Some studies attribute extreme events to rainfall variability due to climate change induced by global warming. However, there is a dearth of climatological studies addressing the trends in rainfall over Sri Lanka in support of such attribution. In our study, statistical analysis such as linear and standard deviation for 3 year, 5 year, 11 year and 21 year periods were utilized to examine periodic rainfall changes in both annual and seasonal contexts. The study finds that the 3, 5 year moving average shows high drier seasons, but the 11, 21 years moving average show higher wet seasons during the period of study. The changes of rainfall are known to have led to disasters such as flood and drought. Annual rainfall varies from 864 mm to 3081 mm, the distribution of which has sight variation throughout the district.
    Źródło:
    World News of Natural Sciences; 2017, 9; 71-78
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Rainfall Variability on Paddy Production: A Case Study in Batticalloa District
    Autorzy:
    Mathanraj, S.
    Kaleel, M. I. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189997.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Agriculture
    Meteorology
    Paddy production
    Rainfall variability
    Opis:
    Climate change has become a major concern to human society because of its potentially deleterious impact worldwide. The degree to which rainfall amounts vary across an area or through time is an important characteristic of the climate of an area. This subject area in meteorology is called "rainfall variability”. Changes in amount, intensity and frequency affect the environment and society. The annual rainfall varies from 864 mm to 3081 mm (146 years data) distribution, which has sight variation throughout the district. The study purposes to examine the relationship between rainfall and paddy production. Samplings from 100 households have been gathered by questionnaire survey as primary data and the secondary data has been collected Meteorological Department, Department of Agriculture and published research reports. 146 years rainfall data and 34 years paddy cultivation data has been utilized to analyse the result. Accurate statistical methods have been used to find the variability that includes correlation and trend analysis of 3, 5 years moving average of standard deviation. As the result, the study finds that through the 3, 5 years moving average had shown high drier seasons of the years. The paddy production was very high in Maha season but this was very low in Yala season because of the rainfall variability. By the correlation between rainfall and paddy production, the significant value is positive in Maha season and this is negative in Yala season. However, both are having the different significance each other. Thus, even the rainfall was highly influenced to the higher production, this is impossible in each time. Therefore, the development of irrigation tanks and channels, rainwater harvesting and proper management would be supported to more production in Yala season.
    Źródło:
    World Scientific News; 2016, 52; 265-275
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Air Quality and Meteorological Variables in Lower Stubbs Creek, Qua Iboe River Estuary, Nigeria
    Autorzy:
    Ogbemudia, F. O.
    Ita, R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031692.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Air pollution
    Air quality
    Lower Stubbs Creek
    Meteorology
    Qua Iboe River Estuary
    gas flaring
    gaseous emissions
    Opis:
    The assessment of air quality and meteorological variables in Lower Stubbs Creek, Qua Iboe River Estuary, Nigeria was carried out using portable hand held gas monitors for atmospheric gases and hygrometer, thermometer, anemometer and digital compass for relative humidity, temperature, wind speed and wind direction. Parameters measured were SO2, NO2, H2S, CO, NH3, Cl2, HCN, PM2.5, PM10, relative humidity, temperature, wind speed and wind direction. The results for the atmospheric gases followed this decreasing magnitude; PM10 (110.35 µ/m3) > PM2.5 (55.66 µ/m3) > CO (19.00 ppm) > NH3 (5.86 ppm) > HCN (1.41 ppm) > H2S (0.77 ppm) > Cl2 (0.47 ppm) > NO2 (0.28 ppm) > SO2 (0.26 ppm). For the meteorological variables, the mean values for temperature, relative humidity and wind speed were 25.86 ºC, 67.71 % and 1.17 m/s. The predominant wind direction was the North Easterly winds. The result for the air quality using 5 criteria pollutants showed that NO2, SO2 had Air Quality Index (AQI) values of 0 each, while CO, PM2.5 and PM10 had AQI values of 224, 151 and 78, respectively. Based on the air quality ratings, the average concentrations of NO2, and SO2 in the atmosphere were good while the concentrations of CO, PM2.5 and PM10 were very unhealthy, unhealthy and moderate, respectively. This study shows that this region is polluted with CO and particulate matters, hence requires prompt intervention plans and consistent monitoring.
    Źródło:
    World News of Natural Sciences; 2020, 28; 121-130
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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