Landslide term is used for all mass movements on slopes, including falling, overturns and flow debris. Using the potential landslide hazard zonation, areas with high potential of landslide hazard can be detected and s...Landslide term is used for all mass movements on slopes, including falling, overturns and flow debris. Using the potential landslide hazard zonation, areas with high potential of landslide hazard can be detected and so prevent the landslide occurrence with providing appropriate solutions. In this study, the landslide hazard zonation along the water transmission lines of the Amir-Almomenin (AS) water supply complex has been done. Studied area is located at the western part of the Northern Khorasan (Bojnord). Study procedure includes the general geology survey, recognition of the most important effective parameters on the landslide phenomena (such as slope, lithology, faults and streams) and has been evaluated as basic maps. Then, each layer was validated based on the importance of the effective factors using the maps weighting method in ArcGis software. Finally, the studied area was zoned based on the landslide potential using the overlapping of the various layers. Final zonation map shows that the North, Northwestern and Median parts of the studied area have the highest landslide potential. These areas are included of Marl and red Marl and to some extend loss deposits with slopes between 14 to more of 50 degrees. Seemingly, faults (due to low occurrence) and streams (due to drought) have lower effect on the landslide potential. However, the degree of the slope and type of lithology are the most important parameters on the landslide potential, respectively.展开更多
Understanding the diversity and taxonomy of Iran＇s lichens has never been more important than it is today, and this is undoubtedly the most exciting subject to be studying in the cryptogamic flora of the country. The...Understanding the diversity and taxonomy of Iran＇s lichens has never been more important than it is today, and this is undoubtedly the most exciting subject to be studying in the cryptogamic flora of the country. The present paper is a part of a more extensive lichenological investigation based on collections made since 2004 in the reserved region Darkesh in the Aladagh mountains. Among a collection of lichens from four localities in the site, in Northern Khorasan province, （NE） IRAN, 13 species were identified, of which five were known outside the province. Lecanora umbrina （Ach.） Massal. is first found in this locality.展开更多
文摘Landslide term is used for all mass movements on slopes, including falling, overturns and flow debris. Using the potential landslide hazard zonation, areas with high potential of landslide hazard can be detected and so prevent the landslide occurrence with providing appropriate solutions. In this study, the landslide hazard zonation along the water transmission lines of the Amir-Almomenin (AS) water supply complex has been done. Studied area is located at the western part of the Northern Khorasan (Bojnord). Study procedure includes the general geology survey, recognition of the most important effective parameters on the landslide phenomena (such as slope, lithology, faults and streams) and has been evaluated as basic maps. Then, each layer was validated based on the importance of the effective factors using the maps weighting method in ArcGis software. Finally, the studied area was zoned based on the landslide potential using the overlapping of the various layers. Final zonation map shows that the North, Northwestern and Median parts of the studied area have the highest landslide potential. These areas are included of Marl and red Marl and to some extend loss deposits with slopes between 14 to more of 50 degrees. Seemingly, faults (due to low occurrence) and streams (due to drought) have lower effect on the landslide potential. However, the degree of the slope and type of lithology are the most important parameters on the landslide potential, respectively.
文摘Understanding the diversity and taxonomy of Iran＇s lichens has never been more important than it is today, and this is undoubtedly the most exciting subject to be studying in the cryptogamic flora of the country. The present paper is a part of a more extensive lichenological investigation based on collections made since 2004 in the reserved region Darkesh in the Aladagh mountains. Among a collection of lichens from four localities in the site, in Northern Khorasan province, （NE） IRAN, 13 species were identified, of which five were known outside the province. Lecanora umbrina （Ach.） Massal. is first found in this locality.
