Case study on impact of seasonal variations of soil resistivities on substation grounding systems safety in tropical country

2011 ◽  
Author(s):  
Noradlina Abdullah ◽  
Aziz Marzuki Ahmad Marican ◽  
Miszaina Osman ◽  
Nurul Azlina Abdul Rahman
Keyword(s):  
Seasonal Variations ◽  
Tropical Country

scholarly journals RAINFALL TREND ANALYSIS OF A MINI WATERSHED: A CASE STUDY ON DEGRADING LAKES/TANKS

2018 ◽  
Vol 6 (7) ◽  
pp. 28-44
Author(s):  
Pradeep Raja K.P. ◽  
Suresh Ramaswwamy Reddy
Keyword(s):  
Trend Analysis ◽  
Daily Rainfall ◽  
Recent Decade ◽  
Kendall Test ◽  
Command Area ◽  
Tropical Country ◽  
South West ◽  
South West Monsoon ◽  
West Monsoon

India as a tropical country, depends solely on south west Monsoon. Southwest monsoon spans between June and September. The present study is aimed to carry out the probable trend of rainfall and to evaluate its implications on the tanks in Hunsur taluk of Mysore district, Karnataka, India. These tanks were the livelihood sources of water for the farmers in the command area. The lakes considered under this case study have been completely dried up in the recent past. Inconsistency of rainfall is one of the factors which govern the degradation of Lakes. Trend analysis is carried on 40 years daily rainfall data (1975-2014) for monthly, seasonal and annual average values using Mann-Kendall test and Sen’s slope estimation. The analysis shows ‘no trend’ for the months of January, February, March and June. There is an ‘increasing trend’ for the months of August, October and December. However, there is a ‘decreasing trend’ for the months of April, May, July, September and November. The decadal variation indicates a very significant decrease of rainfall for the months of June and July; particularly in the recent decade (2005-2014) and hence a ‘negative trend’ in the South-West monsoon. This may be one of the reasons for the deterioration of tanks in the study area.

Use of seepage meters in a groundwater – lake interaction study in a fractured rock basin — a case study

1988 ◽  
Vol 15 (6) ◽  
pp. 984-989 ◽  
Author(s):  
M. P. Attanayake ◽  
D. H. Waller
Keyword(s):  
Seasonal Variations ◽  
Fractured Rock ◽  
Water Levels ◽  
Interaction Study ◽  
Groundwater Levels ◽  
Seepage Meters ◽  
Seepage Meter ◽  
Seepage Measurements ◽  
Chloride Concentrations

Applications of seepage meters in lakes with slight bottom sediments in fractured rock basins have not been reported. A study of the hydrogeology of Long Lake, at Halifax, Nova Scotia, used seepage meters in this situation. Fifteen meters were installed in the 1.7 km2 lake — seven in a line extending from the shore, the remaining eight on the lake periphery. Seepage measurements were made monthly over 1 year. Groundwater levels were measured in boreholes in the fractured granite of the watershed. A positive inflow of groundwater to the lake occurred through the year, seepage flux at the shoreline meters varied from 0.15 to 0.78 mL∙m−2∙s−1, with no consistent seasonal variations. Seepage decreased exponentially with offshore distance. A linear relationship was evident between water levels in a borehole near the shore and rate of seepage at the closest meter. Chloride applied to this borehole was reflected in elevated chloride concentrations in seepage collected by the meter. Key words: seepage meter, groundwater – lake system, fractured rock tracers.

Seasonal variations of carboxylic acids and their contributions to the rainwater acidity: A case study of Guiyang and Shangzhong, China

2010 ◽  
Vol 55 (16) ◽  
pp. 1667-1673 ◽  
Author(s):  
Gang Xu ◽  
XinQing Lee ◽  
YingChun Lü ◽  
YingJun Chen ◽  
DaiKuan Huang
Keyword(s):  
Carboxylic Acids ◽  
Seasonal Variations ◽  
Rainwater Acidity
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