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22 results on '"Bhatti, Asher Samuel"'

9. An increasing trend in daily monsoon precipitation extreme indices over Pakistan and its relationship with atmospheric circulations

Author

Ullah, Waheed, primary, Karim, Aisha, additional, Ullah, Sami, additional, Rehman, Atta-Ur, additional, Bibi, Tehmina, additional, Wang, Guojie, additional, Ullah, Safi, additional, Bhatti, Asher Samuel, additional, Ali, Gohar, additional, Abbas, Adnan, additional, Hagan, Daniel Fiffi Tawia, additional, Nooni, Isaac Kwesi, additional, Zhu, Chenxia, additional, and Hussain, Azfar, additional

Published
2023
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15. Spatiotemporal Characteristics and Trend Analysis of Two Evapotranspiration-Based Drought Products and Their Mechanisms in Sub-Saharan Africa

Author

Nooni, Isaac Kwesi, primary, Hagan, Daniel Fiifi T., additional, Wang, Guojie, additional, Ullah, Waheed, additional, Li, Shijie, additional, Lu, Jiao, additional, Bhatti, Asher Samuel, additional, Shi, Xiao, additional, Lou, Dan, additional, Prempeh, Nana Agyemang, additional, Lim Kam Sian, Kenny T. C., additional, Dzakpasu, Mawuli, additional, Amankwah, Solomon Obiri Yeboah, additional, and Zhu, Chenxia, additional

Published
2021
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16. Spatiotemporal Characteristics and Trend Analysis of two Evapotranspiration-based droughts products and their mechanisms in Sub-Saharan Africa

Author

Nooni, Isaac Kwesi, primary, Hagan, Daniel Fiifi Tawia, additional, Wang, Guojie, additional, Ullah, Waheed, additional, Li, Shijie, additional, Lu, Jiao, additional, Bhatti, Asher Samuel, additional, shi, xiao, additional, Lou, Dan, additional, Prempeh, Nana Agyemang, additional, Lim Kam Sian, Kenny T.C., additional, Dzakpasu, Mawuli, additional, Amankwah, Solomon Obiri Yeboah, additional, and Zhu, Chenxia, additional

Published
2020
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21. Comparing Multiple Precipitation Products against In-Situ Observations over Different Climate Regions of Pakistan.

Author

Ullah, Waheed, Wang, Guojie, Ali, Gohar, Tawia Hagan, Daniel Fiifi, Bhatti, Asher Samuel, and Lou, Dan

Subjects
CLIMATOLOGY, METEOROLOGICAL precipitation, HYDROLOGIC cycle, ATMOSPHERIC physics, MONSOONS
Abstract

Various state-of-the-art gridded satellite precipitation products (GPPs) have been derived from remote sensing and reanalysis data and are widely used in hydrological studies. An assessment of these GPPs against in-situ observations is necessary to determine their respective strengths and uncertainties. GPPs developed from satellite observations as a primary source were compared to in-situ observations, namely the Climate Hazard group Infrared Precipitation with Stations (CHIRPS), Multi-Source Weighted-Ensemble Precipitation (MSWEP), Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks-Climate Data Record (PERSIANN-CDR) and Tropical Rainfall Measuring Mission (TRMM) multi-satellite precipitation analysis (TMPA). These products were compared to in-situ data from 51 stations, spanning 1998–2016, across Pakistan on daily, monthly, annual and interannual time scales. Spatiotemporal climatology was well captured by all products, with more precipitation in the north eastern parts during the monsoon months and vice-versa. Daily precipitation with amount larger than 10 mm showed significant (95%, Kolmogorov-Smirnov test) agreement with the in-situ data, especially TMPA, followed by CHIRPS and MSWEP. At monthly scales, there were significant correlations (R) between the GPPs and in-situ records, suggesting similar dynamics; however, statistical metrics suggested that the performance of these products varies from north towards south. Temporal agreement on an interannual scale was higher in the central and southern parts which followed precipitation seasonality. TMPA performed the best, followed in order by CHIRPS, MSWEP and PERSIANN-CDR. [ABSTRACT FROM AUTHOR]

Published
2019
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22. Applications of Ground Penetrating Radar in Civil Engineering and Geology: case studies from Pakistan.

Author

Bhatti, Asher Samuel, Khan, M. Asif, and Ahmed, Zaheer

Subjects
*GROUND penetrating radar, *GEOLOGY, *CIVIL engineering, *EXPRESS highways, *EARTHQUAKES
Abstract

This article describes a study which demonstrated the applications of Ground Penetrating Radar (GPR) in geology and civil engineering in Pakistan. GPR was deployed in the Motorway M1 Islamabad-Peshawar, roof floor of the buildings in Islamabad, and investigation of rupture in Balakot developed due to the 2005 Kashmir earthquake. Reviews of the operation of GPR systems are given as well as a discussion on data processing and data interpretation techniques.

Published
2010

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