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Your search keyword '"Queaño, Karlo L."' showing total 33 results
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33 results on '"Queaño, Karlo L."'

2. Real-Time and long-term forecasting tools for flood management and quick response.

Author

de Lara-Tuprio, Elvira P., Queaño, Karlo L., Tuprio, Elijah Patrick, Alvarado, Renz, Bandong, Annie, Gatdula, Carleen, Cayas, Ryan Roi, Doria, Christell, and Sombilon, Junifer

Subjects
*ARTIFICIAL neural networks, *MACHINE learning, *RANDOM forest algorithms, *WATER levels, *CITY dwellers, *FLOOD warning systems
Abstract

The forecasting tools presented in this paper were applied in the flood-prone city of Marikina, a highly urbanized city located in the National Capital Region (NCR) of the Philippines. The city is traversed by Marikina River, which inundates nearby communities during heavy downpours. Marikina City has a long history of flooding. Perhaps the most devastating among these not only in Marikina but in the entire NCR is the Typhoon Ondoy which resulted in hundreds of deaths and huge amount of damage to properties. Despite the constant threat of flooding, residents stay in the city and have learned to adapt to the realities of the environmental hazards. For its part, the local government of Marikina has developed an alert system to warn residents of impending flood during heavy rains. Depending on the water level recorded at Sto. Niño station, which is located at a strategic point along Marikina River, residents are advised to either prepare or go to evacuation centers. The disaster response efforts would be best supplemented by real-time forecasts of water level to give both the local government and the residents ample time to prepare. This is the motivation for this study. In this paper, machine learning algorithms such as random forest, artificial neural network and support vector machine were applied on historical data of rainfall and water level recorded at different stations to develop tools to forecast water level at Sto. Niño at least one hour ahead. Results indicated that the random forest model performed better overall than other forecasting models since it has the lowest error metric and the highest correlation coefficient. To supplement the disaster management program and for budget planning purposes, a probabilistic approach was used to obtain long-term forecast in terms of annual frequency and duration of water level reaching at least a specified height. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Adakitic rocks in the Masara gold-silver mine, Compostela Valley, Mindanao, Philippines: Different places, varying mechanisms?

Author

Yumul, Graciano P., Jr., Brown, Walter W., Dimalanta, Carla B., Ausa, Carlito A., Faustino-Eslava, Decibel V., Payot, Betchaida D., Ramos, Noelynna T., Lizada, Adrian Nicol L., Buena, Alfred Elmer, Villaplaza, Barbie Ross B., Manalo, Pearlyn C., Queaño, Karlo L., Guotana, Juan Miguel R., and Pacle, Nichole Anthony D.

Published
2017
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26. Slab rollback and microcontinent subduction in the evolution of the Zambales Ophiolite Complex (Philippines) : A review

Author

Yumul Jr., Graciano P., Dimalanta, Carla B., Salapare, Ricky C., Queaño, Karlo L., Faustino-Eslava, Decibel V., Marquez, Edanjarlo J., Ramos, Noelynna T., Payot, Betchaida D., Guotana, Juan Miguel R., Gabo-Ratio, Jillian Aira S., Armada, Leo T., Padrones, Jenielyn T., Ishida, Keisuke, Suzuki, Shigeyuki, Yumul Jr., Graciano P., Dimalanta, Carla B., Salapare, Ricky C., Queaño, Karlo L., Faustino-Eslava, Decibel V., Marquez, Edanjarlo J., Ramos, Noelynna T., Payot, Betchaida D., Guotana, Juan Miguel R., Gabo-Ratio, Jillian Aira S., Armada, Leo T., Padrones, Jenielyn T., Ishida, Keisuke, and Suzuki, Shigeyuki

Abstract

New radiolarian ages show that the island arc-related Acoje block of the Zambales Ophiolite Complex is possibly of Late Jurassic to Early Cretaceous age. Radiometric dating of its plutonic and volcanic-hypabyssal rocks yielded middle Eocene ages. On the other hand, the paleontological dating of the sedimentary carapace of the transitional mid-ocean ridge – island arc affiliated Coto block of the ophiolite complex, together with isotopic age datings of its dikes and mafic cumulate rocks, also yielded Eocene ages. This offers the possibility that the Zambales Ophiolite Complex could have: (1) evolved from a Mesozoic arc (Acoje block) that split to form a Cenozoic back-arc basin (Coto block), (2) through faulting, structurally juxtaposed a Mesozoic oceanic crust with a younger Cenozoic lithospheric fragment or (3) through the interplay of slab rollback, slab break-off and, at a later time, collision with a microcontinent fragment, caused the formation of an island arc-related ophiolite block (Acoje) that migrated trench-ward resulting into the generation of a back-arc basin (Coto block) with a limited subduction signature. This Meso-Cenozoic ophiolite complex is compared with the other oceanic lithosphere fragments along the western seaboard of the Philippines in the context of their evolution in terms of their recognized environments of generation.

Published
2019

33. Adakitic rocks in the Masara gold-silver mine, Compostela Valley, Mindanao, Philippines: Different places, varying mechanisms?

Author

Jr.Yumul, Graciano P., Brown, Walter W., Dimalanta, Carla B., Ausa, Carlito A., Faustino-Eslava, Decibel V., Payot, Betchaida D., Ramos, Noelynna T., Lizada, Adrian Nicol L., Buena, Alfred Elmer, Villaplaza, Barbie Ross B., Manalo, Pearlyn C., Queaño, Karlo L., Guotana, Juan Miguel R., and Pacle, Nichole Anthony D.

Subjects
*ADAKITE, *MINERALIZATION, *HIGH temperatures, *CRYSTALLIZATION
Abstract

The presence of adakites has been used as an indicator for the occurrence of gold mineralization in many mineral prospecting works. Traditionally, the unique geodynamic controls to adakite formation, particularly the high temperature gradient and other slab-melting requirements, have been taken as key elements that must be present during their formation. However, several studies have suggested alternative mechanisms. This paper presents fractional crystallization as the most viable mechanism for the generation of adakitic rocks in the Masara gold-silver mine in Eastern Mindanao, Philippines. Furthermore, this paper also argues that the occurrence of adakitic rocks does not necessarily indicate the presence of mineralization. Depending on the scale, their occurrence may be an exploration marker at a regional or district level, but at the mine-level, other more localized parameters will have to be considered. [ABSTRACT FROM AUTHOR]

Published
2017
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