scholarly journals Climatic variability on groundwater recharge of Mymensingh district in Bangladesh

2019 ◽  
Vol 30 (1) ◽  
pp. 104-112
Author(s):  
S Akhter ◽  
A Sharmin ◽  
MT Islam ◽  
MS Ullah
Keyword(s):  
Groundwater Recharge ◽  
Potential Evapotranspiration ◽  
Climatic Variability ◽  
Annual Rainfall ◽  
Period Analysis ◽  
Average Temperature ◽  
Annual Variability ◽  
Average Rainfall ◽  
Soil Moisture Balance

A study was carried out in Mymensingh sadar upazila of Bangladesh in order to evaluate the effects of climatic variability on groundwater (GW) recharge and evapotranspiration (ET) over the period of 2006 - 2015. The annual GW recharge was computed by using soil moisture balance method, while CROPWAT-8.0 model was used to determine potential evapotranspiration (PET) and Grindley method was also used to estimate actual evapotranspiration (AET). In the case study area, the average temperature and rainfall showed no trend (almost constant), whereas humidity showed a declining trend over the study period. Analysis of rainfall trend revealed that there was considerable increase in annual rainfall with a mean of 2125 mm found over the study period. Groundwater recharge showed an increasing trend over the whole period, and the maximum recharge of 247.86 mm found in 2013, while maximum GW depletion of 136.8 mm found in 2014. In case of annual PET, the maximum of 1403.76 mm found in 2006, whereas the minimum of 1115.76 mm found in 2013. The AET showed a slightly declining trend over the 10 years of study, and the highest average AET of 1014.24 mm observed in 2007, whereas the lowest of 772.92 mm was in 2013. There was no significant relationship among groundwater recharge and annual variability of average temperature, and average rainfall found while only the annual variability of average humidity was found to be inversely related with groundwater recharge. Progressive Agriculture 30 (1): 104-112, 2019

scholarly journals Climatic Variables of 50 Years and their Trends over Rajshahi and Rangpur Division

2012 ◽  
Vol 4 (2) ◽  
pp. 147-150 ◽  
Author(s):  
MG Ferdous ◽  
MA Baten
Keyword(s):  
Relative Humidity ◽  
Climatic Variability ◽  
Climatic Data ◽  
Climate Factors ◽  
Annual Average ◽  
Average Temperature ◽  
Average Rainfall ◽  
Average Relative Humidity ◽  
Increasing Trends ◽  
Annual Average Temperature

An agro-climatic study was conducted at three regions of Rajshahi division with 50 (1961-2010) years of climatic data (temperature, rainfall, relative humidity and sunshine) to observe the climatic variability. The annual average temperature was showed decreasing trends over Rajshahi, Rangpur and Dinajpur regions by 0.0134, 0.0262 and 0.01180C/year. Annual average rainfall showed increasing trends over Rangpur and Dinajpur region by 14.971, 18.673mm/year and decreasing trends over Rajshahi region by 3.0698mm/year. Average relative humidity was showed increasing trends over Rajshahi, and Dinajpur region by 0.0261, and 0.0269%/year. Over Rangpur region, the decreasing trend was observed by 0.0599%/year. Decreasing trends of sunshine were observed for all regions. Distributions of regional average of climate factors in the study area were observed TRangpur> TRajshahi> TDinajpur, RRangpur> RDinajpur> RRajshahi, RHRangpur> RHDinajpur> RHRajshahi and SDinajpur> SRajshahi> SRangpur for temperature, rainfall, relative humidity and sunshine, respectively.DOI: http://dx.doi.org/10.3329/jesnr.v4i2.10165J. Environ. Sci. & Natural Resources, 4(2): 147-150, 2011

scholarly journals Water balance in karst: case study of the Ribeirão da Onça catchment in Colombo City, Paraná State - Brazil

2007 ◽  
Vol 50 (5) ◽  
pp. 905-912 ◽  
Author(s):  
Leandro Redin Vestena ◽  
Masato Kobiyama
Keyword(s):  
Water Balance ◽  
Groundwater Recharge ◽  
Potential Evapotranspiration ◽  
Balance Method ◽  
River Catchment ◽  
Monitoring Period ◽  
Water Balance Method ◽  
Hydrological Study ◽  
Karst Catchment

With the objective to analyze the hydrological processes and the water balance, a simplified water balance method and the modified Penman formula were applied to the Ribeirão da Onça river catchment in Colombo city, Paraná State. For the analysis, the data obtained during the monitoring period from 1997 to 2000 were utilized. The results showed that the values of the real evapotranspiration estimated by the method of the simplified water balance were negative for the certain periods and for other period sometimes more than those of the potential evapotranspiration estimated by the modified Penman formula. It implied the existence of significant groundwater recharge from other catchments to the study area, and indicates that the simplified water balance method was not suitable for the hydrological study of this karst catchment. The value of the groundwater recharge received by this catchment was estimated as 554 mm/year for the analysis period.

scholarly journals Análise Das Séries Temporais De Precipitação Do Semiárido Paraibano Em Um Período De 100 Anos - 1911 A 2010 (Analysis Of The Time Series Of Precipitation Of The Paraiba Semi Arid In A Period Of 100 Years - 1911 To 2010)

2013 ◽  
Vol 6 (4) ◽  
pp. 680
Author(s):  
Milla Nobrega de Menezes Costa ◽  
Carmem Terezinha Becker ◽  
José Ivaldo Barbosa de Brito
Keyword(s):  
El Niño ◽  
El Nino ◽  
Rainfall Variability ◽  
Climatic Variability ◽  
The State ◽  
La Niña ◽  
Annual Rainfall ◽  
La Nina ◽  
Average Rainfall ◽  
Semi Arid

O estado da Paraíba apresenta cerca de 76% do seu território abrangido pela região semiárida do Nordeste brasileiro, incluindo 170 dos 223 municípios, dentre estes, estão os municípios de Antenor Navarro atual São João do Rio do Peixe, Princesa Isabel, Catolé do Rocha e Soledade que se sobressaem como importantes polos agrícolas e econômicos do estado, e que frequentemente são afetados pela alta variabilidade climática. Neste trabalho, foi analisado para estes 4 municípios a distribuição pluviométrica num período de cem anos (de 1911 até o ano de 2010) verificando as variações e/ou tendências nas suas séries temporais e investigando se existe uma relação entre a Oscilação Decenal do Pacífico (ODP) com a pluviometria anual das 4 localidades. A partir dos resultados obtidos, verificou-se que São João do Rio do Peixe tem a maior média pluviométrica, porém a tendência de sua série temporal apresentando-se negativa, em contraposto aos outros municípios que apresentaram médias pluviométricas menores, porém com tendências positivas. A investigação da influência da ODP na precipitação anual normalizada das séries analisadas mostrou que uma parcela da ODP influência na variabilidade pluviométrica, porém depende da sua intensidade e de outros fatores tais como o dipolo do Atlântico Tropical e eventos de El Niño/La Niña, indicando que maiores investigações devem ser feitas. A B S T R A C T The state of Paraíba has about 76% of its territory covered by the semi-arid region of Northeast Brazil, including 170 of the 223 municipalities, among these are the municipalities of Antenor Navarro current São João do Rio do Peixe, Princesa Isabel, Soledade and Catolé that stand out as important agricultural and economic centers of the state, which are often affected by high climatic variability. This work was analyzed for these four counties rainfall distribution over one hundred years (1911 until 2010) verifying the changes and / or trends in their series and investigating whether there is a relationship between the Pacific Decadal Oscillation ( ODP) with annual rainfall of 4 locations. From the results obtained, it was found that St. John's River Fish has the highest average rainfall, but the tendency of his series showed up negative in opposed to other municipalities that had lower average rainfall, but with positive trends. The investigation of the influence of PDO on normalized annual rainfall series analyzed, showed that a portion of the ODP influence on rainfall variability, but depends on their strength and other factors such as the Tropical Atlantic dipole and El Niño / La Niña, indicating that further investigations should be made.

Impact of Climate Conditions on Field Reliability of Vehicles

2011 ◽  
Vol 121-126 ◽  
pp. 3335-3339 ◽  
Author(s):  
R. Jiang ◽  
Ya Xi Liao ◽  
Chen Lei Fei
Keyword(s):  
Maintenance Management ◽  
Heavy Vehicles ◽  
Steel Mill ◽  
Climate Conditions ◽  
Average Temperature ◽  
Monthly Average ◽  
Average Rainfall ◽  
Average Relative Humidity ◽  
Field Reliability

This paper deal with an analysis of impact of climate conditions on field reliability of vehicles. Two case studies are presented. One case study deals with four heavy vehicles used in a steel mill in Guangzhou, China; and the other deals with 22 buses operated in Changsha, China. The field reliability is measured by monthly average MTBF; the climate conditions are described by monthly average temperature, monthly average relative humidity, and monthly average rainfall. The influence of these variables on the reliability of the vehicles is quantitatively analyzed. It is concluded that the climate conditions have a significant influence on the reliability of the vehicles and the influence can be different in different sites. The analysis is useful for the operational and maintenance management of the vehicles.

scholarly journals Rain Erosion Maps for Wind Turbines Based on Geographical Locations: A Case Study in Ireland and Britain

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
K. Pugh ◽  
M. M. Stack
Keyword(s):  
Wind Turbine ◽  
Western Europe ◽  
Meteorological Data ◽  
Turbine Blades ◽  
Weather Conditions ◽  
Annual Rainfall ◽  
Wind Turbine Blades ◽  
Weather Patterns ◽  
The Uk

AbstractErosion rates of wind turbine blades are not constant, and they depend on many external factors including meteorological differences relating to global weather patterns. In order to track the degradation of the turbine blades, it is important to analyse the distribution and change in weather conditions across the country. This case study addresses rainfall in Western Europe using the UK and Ireland data to create a relationship between the erosion rate of wind turbine blades and rainfall for both countries. In order to match the appropriate erosion data to the meteorological data, 2 months of the annual rainfall were chosen, and the differences were analysed. The month of highest rain, January and month of least rain, May were selected for the study. The two variables were then combined with other data including hailstorm events and locations of wind turbine farms to create a general overview of erosion with relation to wind turbine blades.

scholarly journals Testing Evapotranspiration Estimates Based on MODIS Satellite Data in the Assessment of the Groundwater Recharge of Karst Aquifers in Southern Italy

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 118
Author(s):  
Giovanni Ruggieri ◽  
Vincenzo Allocca ◽  
Flavio Borfecchia ◽  
Delia Cusano ◽  
Palmira Marsiglia ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
Air Temperature ◽  
Southern Italy ◽  
Remotely Sensed ◽  
Actual Evapotranspiration ◽  
Annual Rainfall ◽  
Karst Aquifers ◽  
Southern Apennines ◽  
Remotely Sensed Data ◽  
Empirical Formulas

In many Italian regions, and particularly in southern Italy, karst aquifers are the main sources of drinking water and play a crucial role in the socio-economic development of the territory. Hence, estimating the groundwater recharge of these aquifers is a fundamental task for the proper management of water resources, while also considering the impacts of climate changes. In the southern Apennines, the assessment of hydrological parameters that is needed for the estimation of groundwater recharge is a challenging issue, especially for the spatial and temporal inhomogeneity of networks of rain and air temperature stations, as well as the variable geomorphological features and land use across mountainous karst areas. In such a framework, the integration of terrestrial and remotely sensed data is a promising approach to limit these uncertainties. In this research, estimations of actual evapotranspiration and groundwater recharge using remotely sensed data gathered by the Moderate Resolution Imaging Spectrometer (MODIS) satellite in the period 2000–2014 are shown for karst aquifers of the southern Apennines. To assess the uncertainties affecting conventional methods based on empirical formulas, the values estimated by the MODIS dataset were compared with those calculated by Coutagne, Turc, and Thornthwaite classical empirical formulas, which were based on the recordings of meteorological stations. The annual rainfall time series of 266 rain gauges and 150 air temperature stations, recorded using meteorological networks managed by public agencies in the period 2000–2014, were considered for reconstructing the regional distributed models of actual evapotranspiration (AET) and groundwater recharge. Considering the MODIS AET, the mean annual groundwater recharge for karst aquifers was estimated to be about 448 mm·year−1. In contrast, using the Turc, Coutagne, and Thornthwaite methods, it was estimated as being 494, 533, and 437 mm·year−1, respectively. The obtained results open a new methodological perspective for the assessment of the groundwater recharge of karst aquifers at the regional and mean annual scales, allowing for limiting uncertainties and taking into account a spatial resolution greater than that of the existing meteorological networks. Among the most relevant results obtained via the comparison of classical approaches used for estimating evapotranspiration is the good matching of the actual evapotranspiration estimated using MODIS data with the potential evapotranspiration estimated using the Thornthwaite formula. This result was considered linked to the availability of soil moisture for the evapotranspiration demand due to the relevant precipitation in the area, the general occurrence of soils covering karst aquifers, and the dense vegetation.

scholarly journals Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
Otman EL Mountassir ◽  
Mohammed Bahir ◽  
Driss Ouazar ◽  
Abdelghani Chehbouni ◽  
Paula M. Carreira
Keyword(s):  
Groundwater Recharge ◽  
West Coast ◽  
Exchange Process ◽  
Environmental Isotopes ◽  
Annual Rainfall ◽  
Groundwater Salinization ◽  
Rock Interaction ◽  
North West ◽  
The North ◽  
Water Rock Interaction

AbstractThe city of Essaouira is located along the north-west coast of Morocco, where groundwater is the main source of drinking, domestic and agricultural water. In recent decades, the salinity of groundwater has increased, which is why geochemical techniques and environmental isotopes have been used to determine the main sources of groundwater recharge and salinization. The hydrochemical study shows that for the years 1995, 2007, 2016 and 2019, the chemical composition of groundwater in the study area consists of HCO3–Ca–Mg, Cl–Ca–Mg, SO4–Ca and Cl–Na chemical facies. The results show that from 1995 to 2019, electrical conductivity increased and that could be explained by a decrease in annual rainfall in relation to climate change and water–rock interaction processes. Geochemical and environmental isotope data show that the main geochemical mechanisms controlling the hydrochemical evolution of groundwater in the Cenomanian–Turonian aquifer are the water–rock interaction and the cation exchange process. The diagram of δ2H = 8 * δ18O + 10 shows that the isotopic contents are close or above to the Global Meteoric Water Line, which suggests that the aquifer is recharged by precipitation of Atlantic origin. In conclusion, groundwater withdrawal should be well controlled to prevent groundwater salinization and further intrusion of seawater due to the lack of annual groundwater recharge in the Essaouira region.

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