四川宝兴县观言组沟泥石流危险性分析
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摘要
观言组沟位于5.12大地震灾区四川省宝兴县,是一条老泥石流沟,并正处于成熟期。在大地震前,观言组沟就爆发过泥石流并对沟口的居民及道路造成了很大影响。震后,观言组沟沟道内新产生了大量松散物源,通过实地调查,物源总量不仅对沟口造成巨大威胁,而且极易将灵关河堵塞。通过研究得出,观言组沟泥石流是一条暴雨谷沟型泥石流,而宝兴县降雨主要集中于6月—9月,极易通过集中降雨启动物源。因此,通过对沟内物源启动和拦挡采取工程是非常重要。
The Guanyanzu gully situates at the Baoxing county of Sichuan province,which is the heavy disaster area of the 5.12 Earthquake.The Guanyanzu debris flow gully is an old debris flow gully,and is at the peak of its formation.Before the 5.12 Earthquake,this gully had been broken with debris flows,which wrought severe damages on neighboring residents and passageways in gully head.After the 5.12 Earthquake,a great of loose materials have been created along the channel of Guanyanzu gully.Through the field surveys,the total amount of materials made not only a huge threat to the gully head,but also a block to Lingguan River.According to the analysis,this thesis gets the conclusions as follows: the Guanyanzu debris flow gully is a rainstorm-triggered debris flow.However,the major downpour in Boxing county occurs from June to September.It is very easy to format the material by concentrated rainfall.So it is very important to make engineering in terms of the start and prevent to the gully inside materials.
The Guanyanzu gully situates at the Baoxing county of Sichuan province,which is the heavy disaster area of the 5.12 Earthquake.The Guanyanzu debris flow gully is an old debris flow gully,and is at the peak of its formation.Before the 5.12 Earthquake,this gully had been broken with debris flows,which wrought severe damages on neighboring residents and passageways in gully head.After the 5.12 Earthquake,a great of loose materials have been created along the channel of Guanyanzu gully.Through the field surveys,the total amount of materials made not only a huge threat to the gully head,but also a block to Lingguan River.According to the analysis,this thesis gets the conclusions as follows: the Guanyanzu debris flow gully is a rainstorm-triggered debris flow.However,the major downpour in Boxing county occurs from June to September.It is very easy to format the material by concentrated rainfall.So it is very important to make engineering in terms of the start and prevent to the gully inside materials.
引文
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[5]陈宁生,邓明枫,胡桂胜,等.地震影响下西南干旱山区泥石流危险性特征与防治对策[J].四川大学学报:工程科学版,2010,42(1):1-6.
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[2]DZ/T 0220—2006,泥石流灾害防治工程勘查规范[S].
[3]马欢,张绍和,刘卡伟.泥石流运动参数的计算方法[J].西部探矿工程,2010(6):122-125.
[4]付尚瑜,黄润秋,裴向军,等.5.12地震极重灾区四川安县甘沟泥石流发育特征[J].南水北调与水利科技,2010(5):105-108.
[5]陈宁生,邓明枫,胡桂胜,等.地震影响下西南干旱山区泥石流危险性特征与防治对策[J].四川大学学报:工程科学版,2010,42(1):1-6.
[6]宋志,巴仁基,刘宇杰.磨西河特大型泥石流堵塞大渡河分析[J].灾害学,2010,25(2):73-75.
[7]柳金峰,欧国强,游勇,等.不同出口山脚约束的泥石流淤埋实验研究[J].灾害学,2009,24(3):7-10.
[8]四川省水利电力厅.四川省中小流域暴雨洪水计算手册[M].成都:四川省水利厅,1984:10-15.
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