本文選題：打色爾溝泥石流　切入點(diǎn)：演化歷史　出處：《成都理工大學(xué)》2015年碩士論文

【摘要】：由于對(duì)泥石流活動(dòng)規(guī)律認(rèn)識(shí)的不足,加之西南山區(qū)受地形地勢(shì)影響,人們常在一些地勢(shì)比較開(kāi)闊的老泥石流堆積扇上興建城鎮(zhèn)或工廠(chǎng),泥石流復(fù)活后沖毀建筑物,填埋廠(chǎng)礦,往往造成慘重?fù)p失。而人口密集的理縣老縣城正是建設(shè)在打色爾溝溝口大規(guī)模多期次的古泥石流堆積扇上,若暴發(fā)類(lèi)似歷史規(guī)模的泥石流,后果不堪設(shè)想。泥石流演化歷史的研究對(duì)岷江上游泥石流演化和現(xiàn)代泥石流分析有一定參考作用。而打色爾溝是否會(huì)發(fā)生歷史規(guī)模大小的泥石流又是一個(gè)極具現(xiàn)實(shí)意義的重要的問(wèn)題。本文在收集整理基礎(chǔ)地質(zhì)資料的基礎(chǔ)上,對(duì)打色爾溝古泥石流堆積狀況及震后泥石流狀況進(jìn)行調(diào)研,分析古泥石流的演化及現(xiàn)代泥石流的形成條件,用單溝泥石流評(píng)價(jià)模型對(duì)打色爾溝泥石流進(jìn)行評(píng)價(jià)并預(yù)測(cè)未來(lái)泥石流規(guī)模。取得了如下主要成果:(1)對(duì)打色爾溝溝口古泥石流堆積體進(jìn)行詳細(xì)調(diào)查,從老到新做出Ⅶ期分期,并對(duì)各期次泥石流細(xì)部特征進(jìn)行分析。古泥石流和川西高原構(gòu)造運(yùn)動(dòng)存在一定對(duì)應(yīng)關(guān)系,古泥石流堆積體中第Ⅳ、Ⅵ、Ⅶ期次分別與200ka BP、30-50ka BP、10ka BP川西高原新構(gòu)造運(yùn)動(dòng)相對(duì)應(yīng)。氣候方面,理縣黃土、冰川等分別揭示了氣候變遷對(duì)古泥石流形成、變化的影響。(2)從演化歷史角度預(yù)測(cè)打色爾溝泥石流未來(lái)發(fā)展規(guī)模:古泥石流受構(gòu)造運(yùn)動(dòng)及冰期作用明顯,但隨著雜谷腦冰川的后退和川西高原構(gòu)造運(yùn)動(dòng)的穩(wěn)定,無(wú)法提供超過(guò)古泥石流發(fā)生時(shí)的水源和構(gòu)造運(yùn)動(dòng)時(shí)大量的松散物質(zhì),因此打色爾溝泥石流未來(lái)發(fā)生的規(guī)模不會(huì)超過(guò)古泥石流規(guī)模。打色爾溝泥石流將從冰川泥石流轉(zhuǎn)為暴雨型泥石流。(3)打色爾溝“7.6泥石流”是一次低頻、特大、暴雨溝谷型泥石流,現(xiàn)在泥石流發(fā)展階段為發(fā)展期。發(fā)育特征方面:打色爾溝溝道長(zhǎng),溝道寬窄相間,沖淤相間或疊加,泥石流堆積以溝道堆積為主。流域內(nèi)松散固體物源較豐富,累計(jì)出溝量所占比例小,物源儲(chǔ)備量仍很大。(4)采用劉希林單溝泥石流評(píng)價(jià)模型對(duì)打色爾溝泥石流危險(xiǎn)性進(jìn)行評(píng)價(jià),評(píng)價(jià)結(jié)果是打色爾溝泥石流主溝和1#支溝、3#支溝、4#支溝為中度危險(xiǎn),6#支溝為高度危險(xiǎn)。與理縣泥石流危險(xiǎn)區(qū)劃的應(yīng)用結(jié)果:理縣泥石流危險(xiǎn)度為0.6034,為Ⅲ級(jí)危險(xiǎn)區(qū)(即顯著危險(xiǎn))相一致。(5)通過(guò)物源估計(jì)法和雨洪法預(yù)測(cè)打色爾溝泥石流未來(lái)發(fā)生的規(guī)模,綜合兩種方法,預(yù)測(cè)的結(jié)果為主溝:3.775萬(wàn)方;1#:1.05萬(wàn)方;3#:1.335萬(wàn)方;4#:0.505萬(wàn)方;6#:1.32萬(wàn)方。
[Abstract]:As a result of the lack of understanding of the law of debris flow activities and the influence of topography on the mountainous areas of southwest China, people often build towns or factories on the old debris flow accumulation fans with relatively open terrain. After the debris flow is revived, buildings are destroyed and factories and mines are buried. Often causing heavy losses. And the old county town of Lixian, densely populated, is built on a massive and multi-stage ancient debris flow accumulation fan at the mouth of the Tasiergou gully. If a debris flow of a similar historical scale breaks out, The study of debris flow evolution history has certain reference value for debris flow evolution and modern debris flow analysis in the upper reaches of Minjiang River. On the basis of collecting and sorting basic geological data, The accumulation status of ancient debris flow in Tasiergou and the condition of debris flow after earthquake were investigated, and the evolution of ancient debris flow and the forming conditions of modern debris flow were analyzed. The single gully debris flow evaluation model is used to evaluate the debris flow and predict the scale of the debris flow in the future. The main achievements are as follows: 1) A detailed investigation of the ancient debris flow accumulation at the mouth of the Dasergou gully has been carried out, and from the old to the new stage 鈪，

本文編號(hào)：1653411