CAJ | 학술논문

色斯满沟为大渡河上游右岸一级支流，由于该沟在历史上曾发生过泥石流，因此其沟口处水电站工程的安全问题成为关注焦点。通过野外详细调查和室内综合分析，探讨了该沟泥石流基本特征和形成条件，并进行了风险性评价。研究探明：色斯满沟主要出露燕山期花岗岩，风化程度低，但末次冰碛物发育，沟口堆积扇主体形成于晚更新世末次冰期；全新世以来，因水源条件发生了较大变化，以低频泥石流为主；在极端降雨、地震及沟道等多因素耦合条件下，色斯满沟可暴发大规模堵溃式泥石流。对色斯满沟进行泥石流风险评价，结果为高度风险泥石流沟。
색사만구위대도하상유우안일급지류，유우해구재역사상증발생과니석류，인차기구구처수전참공정적안전문제성위관주초점。통과야외상세조사화실내종합분석，탐토료해구니석류기본특정화형성조건，병진행료풍험성평개。연구탐명：색사만구주요출로연산기화강암，풍화정도저，단말차빙적물발육，구구퇴적선주체형성우만경신세말차빙기；전신세이래，인수원조건발생료교대변화，이저빈니석류위주；재겁단강우、지진급구도등다인소우합조건하，색사만구가폭발대규모도궤식니석류。대색사만구진행니석류풍험평개，결과위고도풍험니석류구。
Sesiman gully is the main tributary at the right bank of upstream of Daduhe River. Debris flow occurred in the gully, thusthesecurityofhydropowerstationatthegullyentranceisanimportantproblem.Inthispaper,onthebasisoffieldinvesti2 gationsandcomprehensivelaboratoryanalysis,theformationconditionsandriskassessmentofdebrisflowintheSesimangully were discussed.The results showed that (1) thehost rock of Sesiman gully is Yanshanian granitewhich has low weathering de2 gree, but the glacial till is w ell developed and the main deposit fan at the gully entrance w as formed in Last Glacial of Late Pleis2 tocene;(2) thehydrologicconditionshavevariedsignificantlywiththeoccurrenceoflow2frequencydebrisflow sinceHolocene;and(3) ahugedam2breakingdebrisflowcanoccurundertheconditionsofearthquakeandextremerainfall.Theriskassessment results of debris flow in the Sesiman gully indicated that the gully has high risk of occurrenceof debris flow.