The spring flood of 2009 in the Red River Valley was exacerbated with severe ice breakup and ice jamming. To assist ice jam mitigation by cutting and breaking up the river ice cover before the flood season and to supp...The spring flood of 2009 in the Red River Valley was exacerbated with severe ice breakup and ice jamming. To assist ice jam mitigation by cutting and breaking up the river ice cover before the flood season and to support the operation of the Red River Floodway, Manitoba Water Stewardship is striving to model the occurrence of ice breakup and simulate the behaviour of ice jamming along the river. An important parameter in ice breakup forecasting is the ice thickness. RADARSAT-2 standard satellite images were collected along the course of the Red River in Manitoba during the 2009-2010 winter to help determine ice thicknesses along the river. Standard images can have transmit-receive polarizations in the horizontal-horizontal (HH) or horizontal-vertical (HV) configurations. Ice thickness measurements were taken in the field during the same time frame when the satellite passed over the Red River Valley. Good correlations were obtained between the HH-backscatter readings and the surveyed ice thicknesses. HV-backscatter readings correlate better with fresh snow depth measurements. Additionally, using same sensor incident angle and flight geometry allows ice thickening rate behavior over the course of the winter to be determined.展开更多
埃德加·斯诺在《红星照耀中国》(Red Star Over China)中采访了大量的中国共产党人,生动讲述了他们的人生故事和革命历程。近一个世纪以来,书中采访的中共高层领导人如毛泽东、朱德、彭德怀等通过不同媒体的宣传和报道已经家喻户...埃德加·斯诺在《红星照耀中国》(Red Star Over China)中采访了大量的中国共产党人,生动讲述了他们的人生故事和革命历程。近一个世纪以来,书中采访的中共高层领导人如毛泽东、朱德、彭德怀等通过不同媒体的宣传和报道已经家喻户晓。书中采访的其他人物也为中国革命事业贡献了自己的才智,作出了非凡贡献。人民教育家徐特立、红色文艺战士危拱之和电气工程师朱作其就是这个广大群体的代表。对这些人物的采访丰富了早期中国共产党的群体形象,从多角度呈现了中国共产党人奋发向上的精神气质。展开更多
文摘The spring flood of 2009 in the Red River Valley was exacerbated with severe ice breakup and ice jamming. To assist ice jam mitigation by cutting and breaking up the river ice cover before the flood season and to support the operation of the Red River Floodway, Manitoba Water Stewardship is striving to model the occurrence of ice breakup and simulate the behaviour of ice jamming along the river. An important parameter in ice breakup forecasting is the ice thickness. RADARSAT-2 standard satellite images were collected along the course of the Red River in Manitoba during the 2009-2010 winter to help determine ice thicknesses along the river. Standard images can have transmit-receive polarizations in the horizontal-horizontal (HH) or horizontal-vertical (HV) configurations. Ice thickness measurements were taken in the field during the same time frame when the satellite passed over the Red River Valley. Good correlations were obtained between the HH-backscatter readings and the surveyed ice thicknesses. HV-backscatter readings correlate better with fresh snow depth measurements. Additionally, using same sensor incident angle and flight geometry allows ice thickening rate behavior over the course of the winter to be determined.
文摘埃德加·斯诺在《红星照耀中国》(Red Star Over China)中采访了大量的中国共产党人,生动讲述了他们的人生故事和革命历程。近一个世纪以来,书中采访的中共高层领导人如毛泽东、朱德、彭德怀等通过不同媒体的宣传和报道已经家喻户晓。书中采访的其他人物也为中国革命事业贡献了自己的才智,作出了非凡贡献。人民教育家徐特立、红色文艺战士危拱之和电气工程师朱作其就是这个广大群体的代表。对这些人物的采访丰富了早期中国共产党的群体形象,从多角度呈现了中国共产党人奋发向上的精神气质。
