陕西宝鸡地区千阳县地质灾害易发性评价.pdf

第27卷第11期
地质通报
Vol 27. No11
2008年11月
GEOLOGICAL BULLETIN OF CHTNA
2008
陕西宝鸡地区干阳县地质灾害易发性评价
孙炜锋,谭成轩",王继明2,吴树仁1,张春山
SUN Wei-feng, TAN Cheng-xuan, WANG Ji-ming, WU Shu-ren ZHANG Chun-shan
国土资源部新构造运动与地质灾害重点实验室;中国地质科学院地质力学研究所,北京100081;
2.中国地质大学(北京),北京100083
1. Key Laboratory of Neotectonic Mouement &Geohazards Ministry of Land and Mineral Resources; Institute of Geomechanics
Chinese Academy of Geological Sciences, Beijing 100081, China;
2. China University of Geosciences (Beijing) Beijing 100083, China
摘要:在对千阳县地质灾害详细调查的基础上,采用定性分析与定量评价相结合的方法,对千阳县地质灾害易发程度进行了评
价分区。首先初步定性分析了地质灾害的分布特征和影响因素;其次利用地理信息系统技术,选取斜坡几何形态、工程地质岩
组、黄土覆盖层厚度、地质构造和水文地质条件5个方面共28个指标作为评价因子,利用信息量摸型对千用县的地质灾害进行
易发性评价分区。评价分区结果表明:高易发区占全区面积的4.89%,主要分布于千河北岸黄土塬区一级支流沟谷两侧的振边
斜坡地区;中易发区占全区面积的24.18%,主要位于千河北岸台塬区一级支流沟谷的两側,北部山区二、三级支流冲蚀的基岩
白垩系一侏罗系砂泥岩)与黄土的接触区,南部山区局部黄土覆盖的高陡区域;低易发区占全区总面积的41.29%,主要位于千
日北部山区的二、三级河流河道冲蚀区,千河北岸黄土塬区和千河南部的基岩山区。
关鍵词:噢西省千日县;地质灾害;地理信息系统;信息量模型;易发性评价分区
中图分类号:P694
文献标志码:A
文章编号:1671-2552(2008)11-1846-08
Sun W F, Tan C X, Wang M, Wu S R, Zhang C S. Geohazard susceptibility evaluation of Qianyang County, Baoji area,
Shaanxi, China Geological Bulletin of China, 2008, 27(11 1846-1853
Abstract: Based on detailed investi ation of geohazards in Qianyang County, the authors made evaluation zoning of geohazard suscep.
tibility degrees in Qianyang County by using the combined qualitative analysis and quantitative evaluation. First, they qualitatively ana-
lyzed the distribution characteristics and main influence factors of geohazards, then the geometric shape of the slope, engineering ge-
logical rack fabrics, thickness of loess overburden, geological structure and hydrogeological conditions and 28 indicators were selected
as the evaluation factors, and the susceptibility evaluation zoning of geohazards in Qianyang County was performed by using the geo-
graphical information s stem technique and the information amount model. Hi h-class usceptibility districts account for 4.8%of the
area of the whole region, mainly distributed in the slope on the side of the loess"Yuan on both sides of the first-order distributary in
the loess" Yuan area on the north bank of the Qianhe River moderate-class susceptibility istricts account for 24.18% of the region
mainly located on both sides of the first-order distributary in the loess "Yuan"arca on the north bank of the Qianhe River and in the
contact area between loess and bedrocks(cretaceous-jurassic sandy mudstone) eroded by the second-and third-order distributaries in
the mountainous area in the north, as well as the high and steep area covered locally by the mountainous area in the south; low-class
susceptibility istricts account for 41. 29 of the region, mainly lying in erosion areas of the second-and third-order river channels in
the mountainous area in the north of Qianyang and in the loess"Yuan"area on the north bank of the Qianhe River and the bedrock
mountainous area south of the Qianhe River.
Key words: geographical informaton em(G om m me lion zonn az aax
收稿日期:2008-08-04;修订日期:2008-08
地调项目:中闲地质调査局项日《宝鸡市地质灾害详细调查》(编号:1212010640401)、国家“十一五”规划科技支撑项臼(编号
2006BAC04B05)、科技部公益基础项目(编号:2004DB3J080)和地质力学研究所基本科研业务费项目(编号
DZALXJK200717)联合资助。
作者简介:孙炜锋(197~),男,在读博上,从事地质灾害方面的研究。E-ーmail]sunwfcne@yaho.com,cn