The spectacular scenery of Glacier National Park is the result of glacial erosion as well as post-glacial mass wasting processes. Debris flow magnitude and frequency have been established through extensive fieldwork a...The spectacular scenery of Glacier National Park is the result of glacial erosion as well as post-glacial mass wasting processes. Debris flow magnitude and frequency have been established through extensive fieldwork across seven separate drainage basins in the eastern portion of the park. This paper summarizes the investigation of the hypotheses that debris flow distribution in the Glacier National Park, east of the Continental Divide is （a） not random; and Co） concentrated adjacent to the Continental Divide. The location of 2317 debris flows were identified and mapped from sixty-three 1-m resolution Digital Orthophoto Quarter Quadrangles and their spatial distribution was then analyzed using ArcView Spatial Analyst GIS software. The GIS analysis showed that the debris flows are not randomly distributed nor are they concentrated directly adjacent to the Divide. While the Continental Divide provides orographic enhancement of precipitation directly adjacent to the Divide, the debris flows are not concentrated there due to a lack of available weathered regolith. The most recent Little Ice Age glaciation removed the debris directly adjacent to the Divide, and without an adequate debris supply, these steep slopes experience few debris flows. Both abundant water and an adequate debris supply are necessary to initiate slope failure, resulting in a clustering of debris flows at the break in slope where valley walls contact talus slopes. A variety of summer storm and antecedent moisture conditions initiate slope failures in the Glacier National Park, with no distinct meteorological threshold. With over two million visitorsevery year, and millions of dollars of park infrastructure at risk, identifying the hazard of debris flows is essential to future park management plans.展开更多
African American narratives are peopled with subjectivities struggling to retrieve and reconstruct themselves as persons--and thus citizens--through and against American legal narratives, where personhood and citizens...African American narratives are peopled with subjectivities struggling to retrieve and reconstruct themselves as persons--and thus citizens--through and against American legal narratives, where personhood and citizenship are concerned. Thus, there was the problematic for blacks of how to apply citizenship to their corporeal existence when they were labeled as property. The historical legal narrative of America was constructed on the power of the dominant white elite to prevent the emergence of a narrative of African American life other than that which they authorize, legislate, and narrate. To this end, it has been argued, that narratives in African American literature treat the question of the legal status of African Americans or have it as a fundamental trope of struggle in the narrative. This idea suggests that the law＇s ability as a shaper and determinant of African American social identity, presets the narrative base for African American narrative. This paper examines the relationship between ＂＇laws of separations＂, and African American narrative through a rereading of works of two contemporary novelists, Toni Morrison and Gloria Naylor. Their works, the author argue, are counter-positioned narratives that create contentious dialogue and elaborate the way in which segregationist codes and Jim Crow laws are grounded in the very nature of citizenship for African Americans.展开更多
In the public dialogue surrounding the development of the 2015 dietary guidelines for Americans, public health and environmental advocates converged around a simple theme of shifting towards a more plant-forward Medit...In the public dialogue surrounding the development of the 2015 dietary guidelines for Americans, public health and environmental advocates converged around a simple theme of shifting towards a more plant-forward Mediterranean-style diet. A robust body of literature documenting the health benefits of this eating pattern provides compelling reasons to change our dietary habits in ways that also benefit our environment, but we also need to have the right foods available and affordable to support this modest shift. This commentary discusses the gaps in current US dietary intakes compared to recommendations for meat and protein versus plant-based foods and the potential health benefits of shifting towards a more plant-based diet, focusing on the complex role of Mediterranean crops, such as tree nuts and olive oils, needed to support this shift.展开更多
基金This research was partially by a Minnesota State University-Mankato Faculty Research Grant
文摘The spectacular scenery of Glacier National Park is the result of glacial erosion as well as post-glacial mass wasting processes. Debris flow magnitude and frequency have been established through extensive fieldwork across seven separate drainage basins in the eastern portion of the park. This paper summarizes the investigation of the hypotheses that debris flow distribution in the Glacier National Park, east of the Continental Divide is （a） not random; and Co） concentrated adjacent to the Continental Divide. The location of 2317 debris flows were identified and mapped from sixty-three 1-m resolution Digital Orthophoto Quarter Quadrangles and their spatial distribution was then analyzed using ArcView Spatial Analyst GIS software. The GIS analysis showed that the debris flows are not randomly distributed nor are they concentrated directly adjacent to the Divide. While the Continental Divide provides orographic enhancement of precipitation directly adjacent to the Divide, the debris flows are not concentrated there due to a lack of available weathered regolith. The most recent Little Ice Age glaciation removed the debris directly adjacent to the Divide, and without an adequate debris supply, these steep slopes experience few debris flows. Both abundant water and an adequate debris supply are necessary to initiate slope failure, resulting in a clustering of debris flows at the break in slope where valley walls contact talus slopes. A variety of summer storm and antecedent moisture conditions initiate slope failures in the Glacier National Park, with no distinct meteorological threshold. With over two million visitorsevery year, and millions of dollars of park infrastructure at risk, identifying the hazard of debris flows is essential to future park management plans.
文摘African American narratives are peopled with subjectivities struggling to retrieve and reconstruct themselves as persons--and thus citizens--through and against American legal narratives, where personhood and citizenship are concerned. Thus, there was the problematic for blacks of how to apply citizenship to their corporeal existence when they were labeled as property. The historical legal narrative of America was constructed on the power of the dominant white elite to prevent the emergence of a narrative of African American life other than that which they authorize, legislate, and narrate. To this end, it has been argued, that narratives in African American literature treat the question of the legal status of African Americans or have it as a fundamental trope of struggle in the narrative. This idea suggests that the law＇s ability as a shaper and determinant of African American social identity, presets the narrative base for African American narrative. This paper examines the relationship between ＂＇laws of separations＂, and African American narrative through a rereading of works of two contemporary novelists, Toni Morrison and Gloria Naylor. Their works, the author argue, are counter-positioned narratives that create contentious dialogue and elaborate the way in which segregationist codes and Jim Crow laws are grounded in the very nature of citizenship for African Americans.
文摘In the public dialogue surrounding the development of the 2015 dietary guidelines for Americans, public health and environmental advocates converged around a simple theme of shifting towards a more plant-forward Mediterranean-style diet. A robust body of literature documenting the health benefits of this eating pattern provides compelling reasons to change our dietary habits in ways that also benefit our environment, but we also need to have the right foods available and affordable to support this modest shift. This commentary discusses the gaps in current US dietary intakes compared to recommendations for meat and protein versus plant-based foods and the potential health benefits of shifting towards a more plant-based diet, focusing on the complex role of Mediterranean crops, such as tree nuts and olive oils, needed to support this shift.
