Comparison of dissolved and particulate arsenic distributions in shallow aquifers of Chakdaha, India, and Araihazar, Bangladesh

Background  

The origin of the spatial variability of dissolved As concentrations in shallow aquifers of the Bengal Basin remains poorly understood. To address this, we compare here transects of simultaneously-collected groundwater and aquifer solids perpendicular to the banks of the Hooghly River in Chakdaha, India, and the Old Brahmaputra River in Araihazar, Bangladesh.     

平山县泥石流的形成特征和机理分析

平山县是河北省太行山区主要泥石流地质灾害频发区,每年7～8月份强降雨期间,沟谷源头侧壁岩土体在雨水的浸泡下失稳破坏,形成崩塌与滑坡,崩滑的岩土体与沟源洼地中积聚的洪水迅速混合形成泥石流。本文认真分析了该区泥石流的分布概况,研究了泥石流灾变的形成特征,并从泥石流形成的物源条件和动力条件两方面分析了泥石流发生的机理和崩滑转化机制。