Henry Agbogun

• PhD
• Professor (Assistant) at Fort Hays State University

This study examines the sedimentation rates (SR) during the last 20 kyr in the Niger Delta using selected biostratigraphic datum levels. Three gravity cores (GCs) collected at −40 m below sea level from the shallow offshore Niger Delta (GC1 = Western, GC2 = Central, and GC3 = Eastern) were analysed for their calcareous nannoplankton species ( Emili...

The tropical Wouri Estuary in Cameroon receives water from three main rivers which distinctly drain different rock terrain. The estuary is also surrounded by mangrove forests and hosts diverse urban, industrial, and agricultural activities, which contribute to intricate sediment dynamics and elevated pollutant levels, reflecting the geogenic and an...

This study examines the distributions of heavy metals (As, Al, Cd, Co, Cr, Cu, Fe, Ni, Pb, Zn) in different water bodies (pond, well, lake, river, beach) from three Midcontinent region (Missouri, Iowa, and Nebraska) of USA to determine their source and health implications. The water sample collection was carried out during the Spring 2024 by sampli...

Sediment flux in estuaries can be influenced by natural and anthropogenic inputs, as such understanding its variation is vital for effective environmental management. The tropical Wouri Estuary in Cameroon receives water from three main rivers draining urban, industrial, and agricultural areas. The complex inputs into the estuary can significantly...

We conducted a time series analysis of key water quality parameters (salinity, dissolved oxygen (DO), and pH) in a tidal creek (Dr. Creek) between the coastline and a mangrove forest. Our objectives were to document temporal variations in tide-induced physicochemical changes and to determine the role of seawater-freshwater mixing in controlling the...

n most universities the Center for Teaching and Learning recognizes the challenges of finding time to research, plan, and execute new ideas that can support students learning and group engagement. As a result, we present short teaching tidbits that serve as a resource for tips, reflections, tools, and new teaching strategies. The aim is to provide...

Many of the world's major urban centers are established at the land-sea boundary of estuaries. Anthropogenic activities in these urban centers and in the estuaries may lead to pollution of estuaries with nutrients (e.g., nitrates and phosphates). Nutrients are important drivers of primary productivity in the water column which regulate carbon cycli...

The Wouri estuary is surrounded by numerous tidal creeks transecting a wide range of communities and geology. Diverse ecosystems, varied human activities, and diurnal tidal changes are expected to significantly influence the chemical properties of these tidal creeks. We evaluated two selected tidal creeks to understand physiochemical changes result...

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A method is presented for interpreting the values of x-ray attenuation coefficients reconstructed in computed tomography of porous media, while overcoming the ambiguity caused by the multichromatic nature of x-rays, dilution by void, and material heterogeneity. The method enables determination of porosity without relying on calibration or image seg...

Using x-ray micro-computed tomography (micro-CT) for quantitative measurements in porous media is inherently challenged by uncertainties, which need to be identified and quantified to enable meaningful interpretation of measurements. For this purpose, we present results of experiments using micro-CT to measure the three-dimensional distribution of...

X-ray micro-computed tomography (micro-CT) techniques for measuring the three-dimensional (3-D) distributions of diffusion-accessible porosity (φ(d)) and temporal tracer-concentrations (C(t)) within a dolostone sample subjected to solute diffusion are developed and tested in this work. The φ(d) and C(t) measurements are based on spatially resolved...

Diffusive solute transport is a key issue in the assessment of rocks of low hydraulic conductivity for waste containment purposes. It is therefore pertinent to measure porosity as it is an important control on solute transport, and solute concentration distributions as they are the fundamental indicator of transport direction and rate. This work pr...

Porosity and solute concentration distribution are important parameters necessary for the assessment of diffusive solute transport. This work presents the measurement of these key parameters on a sub-mm scale. The spatial distribution of these parameters has been measured using micro-computed tomography (micro-CT) at a spatial resolution of approxi...