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岷江流域映秀—茂县段地震次生地质灾害分布规律及发展趋势分析

DOI: 10.6046/gtzyyg.2014.04.28, PP. 179-186

Keywords: 汶川大地震,地震次生地质灾害,航空遥感,分布规律,发展趋势分析

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Abstract:

2008年汶川大地震引发了岷江流域映秀—茂县段极为严重的地震次生地质灾害。利用震后多期高分辨率航空遥感数据并结合解译标志,快速、准确地分析研究区灾害的分布规律及发展趋势,对科学指导灾后重建具有重要意义。次生地质灾害分布规律主要表现为:1滑坡、崩塌及其过渡类型——崩滑为主要的次生地质灾害类型(占90%以上);2次生地质灾害广泛分布在岷江两岸山坡,但在映秀—汶川段的发育程度和规模比汶川—茂县段大得多。研究区次生地质灾害发展趋势分析结果表明:1地震形成的滑坡体趋于稳定,但解译的21个潜在滑坡体中部分已出现活动迹象,其中斗簇和沏底关2个潜在滑坡群更为明显,应对其进行遥感连续动态监测;2泥石流为研究区今后最主要的灾害类型,其中映秀—汶川段为最主要的发生地段。

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