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Full-Text Articles in Engineering
Study Of Seasonal Rainfall Infiltration Via Time-Lapse Surface Electrical Resistivity Tomography: Case Study Of Gamboa Area, Panama Canal Watershed, Alexis Mojica, Irving Díaz, Carlos Ho, Fred Ogden, Reinhardt Pinzón, José Fábrega, David Vega, Jan Hendrickx
Study Of Seasonal Rainfall Infiltration Via Time-Lapse Surface Electrical Resistivity Tomography: Case Study Of Gamboa Area, Panama Canal Watershed, Alexis Mojica, Irving Díaz, Carlos Ho, Fred Ogden, Reinhardt Pinzón, José Fábrega, David Vega, Jan Hendrickx
Fred L. Ogden
The present investigation was focused on the variations in rainwater infltration experienced by soils of Gamboa zone (Panama Canal Watershed) during various seasons of the year, employing a time-lapse analysis of electrical resistivity tomography (ERT). In 2009, a total of 3 geoelectrical tests were undertaken during the dry, transition and rainy seasons across a profle 47 m in length, strategically distributed on site. The results obtained in this study showed strong variations in calculated resistivity between these seasons, taking the dry season as a reference with decreases and increases of percent diference of resistivity between -20% and -100%, and between …
Estimates Of Biomass And Fixed Carbon At A Rainforest In Panama, Reinhardt Pinzón, José Fábrega, David Vega, Erick N. Vallester, Rafael Aizprúa, Francisco R. López-Serrano, Fred Ogden, Kleveer Espino
Estimates Of Biomass And Fixed Carbon At A Rainforest In Panama, Reinhardt Pinzón, José Fábrega, David Vega, Erick N. Vallester, Rafael Aizprúa, Francisco R. López-Serrano, Fred Ogden, Kleveer Espino
Fred L. Ogden
This paper presents an estimation of the quantity of carbon fixed in trees in a one hectare (ha) plot at the Cerro Pelado-Gamboa Hydrology Tropical Observatory, which is located in the province of Colon, Panama. The estimation of carbon fixed in trees may provide significant information on carbon flux due to water circulation, which may ultimately enable evaluation of the carbon cycle. All trees larger than 10 cm diameter at breast height (DBH) in the plot were investigated. Carbon fixed within these trees was estimated using a parameterized formula. Tree biomass estimations for the plot were 97.21 Mg ha -1. …
First-Order Catchment Mass Balance During The Wet Season In The Panama Canal Watershed, Fred Ogden
First-Order Catchment Mass Balance During The Wet Season In The Panama Canal Watershed, Fred Ogden
Fred L. Ogden
Tropical hydrology is poorly understood for a number of reasons. Intense biological activity in the tropics introduces complexities to the hydrologic process. Bioturbation, rapid rates of decay, and intensive insect activity all tend to promote rapid flow paths in the upper soil. Aggressive weathering leads to clays depleted of light cations and deep soil profiles. Processes in the seasonal tropics are further complicated by seasonal transitions, and very large changes in catchment storage between seasons. Beginning in 2005, we installed a suite of hydrologic sensors in a 16.7 ha first-order catchment in the Panama Canal Watershed to observe hydrologic variables …
Runoff Production In The Upper Rio Chagres Watershed, Panama, Fred Ogden
Runoff Production In The Upper Rio Chagres Watershed, Panama, Fred Ogden
Fred L. Ogden
Runoff production in tropical watersheds is governed by a wide variety of potential sources and there have been few rigorous studies to date. The 414 km2 upper Río Chagres basin offers a unique opportunity to better understand the runoff production mechanisms in tropical watersheds through data analysis and modeling with rainfall and runoff data. Flow data and tipping bucket rain gage data are available at both the basin outlet (Chico gage) and for an 80.6 km2 internal basin location (Piedras gage). Modeling is performed using the Sacramento Soil Moisture Accounting Model (SAC-SMA), calibrated using data from 2000 and verified using …