Jabari Jones - Academia.edu (original) (raw)

Papers by Jabari Jones

Research paper thumbnail of Assessing the Role of Turbulence in the Entrainment of an Individual Gravel Particle

Despite many decades of study, the mechanics of bed load transport are poorly understood. Without... more Despite many decades of study, the mechanics of bed load transport are poorly understood. Without a strong understanding, it is difficult to assess the movement of sediment through natural systems. The purpose of this study is to investigate the effects of turbulence on the entrainment of an individual pebble-sized particle. During the summer of 2014, flume experiments were conducted at the University of Minnesota, Twin Cities. High-speed video of pebble entrainment was recorded and analyzed using particle-imaging velocimetry (PIV) to assess the importance of a variety of turbulence statistics. The data presented here show that the drag force, approximated by u2, is the statistic best correlated with entrainment. Other turbulence statistics were found to be important, with downstream velocity (u) and Reynolds normal stresses (u′u′ and u′v′) all showing roughly equal correlations. Reynolds shear stress, u′v′, is poorly correlated with entrainment. A quadrant analysis revealed outward...

Research paper thumbnail of Historical Channel Change Caused by a Century of Flow Alteration on Sixth Water Creek and Diamond Fork River, UT

Changes in the amount of water and sediment that enter a river can change its shape and size. The... more Changes in the amount of water and sediment that enter a river can change its shape and size. The way that rivers change is affected by a variety of factors, including the size of the sediment in the river, and past changes to the river. The Diamond Fork River in central Utah has been altered by water deliveredfromthe Colorado River system for over a century. Beginning in 1915, water used for irrigation was delivered through a tributary, Sixth Water Creek, with daily summer flows that were much larger than natural flows. This caused drastic change to the rivers, as they became wider and vegetation along the channel margin and floodplain was destroyed. Management changes in 1997 and 2004 reduced the amount of water and sediment added to the river. In this study, we sought to understand how Sixth Water and Diamond Fork changed in the past and what the implications are for the future. We used data from a variety of sources to describe how and why the river changed in the past. Our resu...

Research paper thumbnail of Stream classification and gravel-bar inventory for Buffalo National River and Ozark National Scenic Riverways

Scientific Investigations Report, 2021

Research paper thumbnail of We need accomplices, not allies in the fight for a more equitable geoscience

Research paper thumbnail of More than fun in the sun: The pedagogy of field trips improves student learning in higher education

Journal of Geoscience Education, 2021

Field experiences are a fundamental and well-loved tool for teaching in the natural sciences. How... more Field experiences are a fundamental and well-loved tool for teaching in the natural sciences. However, a number of concerns threaten continued incorporation of field experiences into courses, including increased class sizes, strained finances, legal liability, accessibility concerns, and the effects of COVID-19. Because of these barriers, it is critically important to investigate and articulate the value of field trips to better advocate for their continued implementation. By reviewing existing literature on traditional field trips and courses, virtual field experiences, and accessible field trips, we have identified several attributes that contribute to the value of field trips as a pedagogical tool. The strength of field activities lies in (1) the integration of active learning, (2) the co-creation of knowledge through collaborative, problem-based activities, (3) place-based learning that provides real-world context, and (4) rapid feedback between peers and instructors. These strategies are well-represented in scholarship on teaching and learning, and further, strategies implemented in field learning may help to reduce the achievement gap for underrepresented groups. Applying the four attributes of field trip pedagogy to classroom and virtual classroom activities, as well as to virtual field trips, can improve teaching and learning when field trips are not possible. Instructors should aim to re-create as many of these attributes as possible to design courses that are as impactful as those involving traditional field trips.18 month embargo; published online: 04 October 2021This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu

Research paper thumbnail of We Need Accomplices, Not Allies in the Fight for an Equitable Geoscience

AGU Advances, 2021

The killing of George Floyd on May 25, 2020 sparked a global movement for black lives that extend... more The killing of George Floyd on May 25, 2020 sparked a global movement for black lives that extended into the geosciences. Nearly a year later, some momentum has been sustained, but the appetite for transformative change to generate a more equitable geoscience is lacking. In this article, I detail my struggles to balance science, activism, and anguish as a black geoscientist in Minneapolis over the last year. I suggest that a riskier and deeper involvement in the work of equity and inclusion is necessary to transform our discipline into a diverse, equitable, and inclusive space where all people can thrive.

Research paper thumbnail of Assessing the Role of Turbulence in the Entrainment of an Individual Gravel Particle

Despite many decades of study, the mechanics of bed load transport are poorly understood. Without... more Despite many decades of study, the mechanics of bed load transport are poorly understood. Without a strong understanding, it is difficult to assess the movement of sediment through natural systems. The purpose of this study is to investigate the effects of turbulence on the entrainment of an individual pebble-sized particle. During the summer of 2014, flume experiments were conducted at the University of Minnesota, Twin Cities. High-speed video of pebble entrainment was recorded and analyzed using particle-imaging velocimetry (PIV) to assess the importance of a variety of turbulence statistics. The data presented here show that the drag force, approximated by u2, is the statistic best correlated with entrainment. Other turbulence statistics were found to be important, with downstream velocity (u) and Reynolds normal stresses (u′u′ and u′v′) all showing roughly equal correlations. Reynolds shear stress, u′v′, is poorly correlated with entrainment. A quadrant analysis revealed outward...

Research paper thumbnail of Historical Channel Change Caused by a Century of Flow Alteration on Sixth Water Creek and Diamond Fork River, UT

Changes in the amount of water and sediment that enter a river can change its shape and size. The... more Changes in the amount of water and sediment that enter a river can change its shape and size. The way that rivers change is affected by a variety of factors, including the size of the sediment in the river, and past changes to the river. The Diamond Fork River in central Utah has been altered by water deliveredfromthe Colorado River system for over a century. Beginning in 1915, water used for irrigation was delivered through a tributary, Sixth Water Creek, with daily summer flows that were much larger than natural flows. This caused drastic change to the rivers, as they became wider and vegetation along the channel margin and floodplain was destroyed. Management changes in 1997 and 2004 reduced the amount of water and sediment added to the river. In this study, we sought to understand how Sixth Water and Diamond Fork changed in the past and what the implications are for the future. We used data from a variety of sources to describe how and why the river changed in the past. Our resu...

Research paper thumbnail of Stream classification and gravel-bar inventory for Buffalo National River and Ozark National Scenic Riverways

Scientific Investigations Report, 2021

Research paper thumbnail of We need accomplices, not allies in the fight for a more equitable geoscience

Research paper thumbnail of More than fun in the sun: The pedagogy of field trips improves student learning in higher education

Journal of Geoscience Education, 2021

Field experiences are a fundamental and well-loved tool for teaching in the natural sciences. How... more Field experiences are a fundamental and well-loved tool for teaching in the natural sciences. However, a number of concerns threaten continued incorporation of field experiences into courses, including increased class sizes, strained finances, legal liability, accessibility concerns, and the effects of COVID-19. Because of these barriers, it is critically important to investigate and articulate the value of field trips to better advocate for their continued implementation. By reviewing existing literature on traditional field trips and courses, virtual field experiences, and accessible field trips, we have identified several attributes that contribute to the value of field trips as a pedagogical tool. The strength of field activities lies in (1) the integration of active learning, (2) the co-creation of knowledge through collaborative, problem-based activities, (3) place-based learning that provides real-world context, and (4) rapid feedback between peers and instructors. These strategies are well-represented in scholarship on teaching and learning, and further, strategies implemented in field learning may help to reduce the achievement gap for underrepresented groups. Applying the four attributes of field trip pedagogy to classroom and virtual classroom activities, as well as to virtual field trips, can improve teaching and learning when field trips are not possible. Instructors should aim to re-create as many of these attributes as possible to design courses that are as impactful as those involving traditional field trips.18 month embargo; published online: 04 October 2021This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu

Research paper thumbnail of We Need Accomplices, Not Allies in the Fight for an Equitable Geoscience

AGU Advances, 2021

The killing of George Floyd on May 25, 2020 sparked a global movement for black lives that extend... more The killing of George Floyd on May 25, 2020 sparked a global movement for black lives that extended into the geosciences. Nearly a year later, some momentum has been sustained, but the appetite for transformative change to generate a more equitable geoscience is lacking. In this article, I detail my struggles to balance science, activism, and anguish as a black geoscientist in Minneapolis over the last year. I suggest that a riskier and deeper involvement in the work of equity and inclusion is necessary to transform our discipline into a diverse, equitable, and inclusive space where all people can thrive.