攀枝花大河流域仁和街幅地质灾害遥感调查与分布规律分析

通过对攀枝花大河流域仁和街幅地质灾害的遥感解译和现场调查,共获得地质灾害点61处,其中以崩塌滑坡为主,泥石流次之。在此基础上,利用GIS空间分析方法对灾害点的空间分布与距水系距离、距断层距离、地形坡度、海拔高程、地层岩性的关系进行统计分析。结果表明:地质灾害点分布较少;崩塌滑坡主要受水系控制,沿水系呈线状分布,在距离水系300m范围内分布密度最大;海拔高程、地层岩性和距断层距离都是影响崩塌滑坡分布的重要因素;崩塌滑坡主要分布在海拔高度1 300~1 600m范围内;距断层1km范围内,崩塌滑坡分布密度最大;软弱半成砂岩、泥岩出露的地方更易发生地质灾害;在坡度0°~15°范围内,分布密度最大。

REMOTE SENSING INVESTIGATION AND ANALYSIS REGULARITIES OF DISTRIBUTION OF GEOLOGICAL HAZARDS IN RENHEJIE MAP SHEET OF DAHE RIVER BASIN,PANZHIHUA.

Through remote sensing interpretation and field investigation in Renhejie map sheet of Dahe river basin, Panzhihua, 61 geohazards were mapped, which mainly were landslides.The distribution of these geohazards was analyzed statistically using GIS to determine the relationship of the occurrence of geohazards with the drainage system, faults, slope gradient, elevation and rock type.The main results of this research can be summarized as follows: The spatial distribution of the landslides is dominated by the drainage system and it shows the feature of linear distribution along the rivers.Within the buffer of 400 m from the drainage system, the landslides density is the largest.The elevation, rock type and distance from faults also influence the landslide distribution.Most landslides occurred in the elevation of 1 300 m~1 600 m above sea-level.The landslides were mainly distributed in the buffer of 1 km from the faults.Many landslides mainly occurred in the soft rocks such as mudstone and Sandston.Most landslides occur in the slope gradient of 0°~15°.