OBSERVATIONS ON SOME PHYSICAL-CHEMICAL CHARACTERISTICS OF RIVER-ICE BREAKUP. TECHNICAL NOTE
OBSERVATIONS ON SOME PHYSICAL-CHEMICAL CHARACTERISTICS OF RIVER-ICE BREAKUP. TECHNICAL NOTE
复制标题
对河冰破裂的一些物理化学特征的观察。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Prowse
中科院分区：
文献类型：
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作者：
D. Milburn;T. Prowse
北方河流的溃决是一个壮观的过程，能够改变水文、地貌和生物状况。为了开始评估与河冰破裂有关的物理和化学特性，对加拿大北方的一条大河利亚德河进行了一些探索性实地研究。主要目的是对基本水化学参数、悬浮沉积物浓度和大小以及活跃分裂期间的相关微量元素进行时间序列测量。结果表明，虽然水质特性，如pH值和电导率保持相对恒定，溶解氧迅速增加，破碎进展，并达到过饱和的水平。就在解体之前，形成了细颗粒沉积物羽流，导致悬浮沉积物浓度达到非常高的高峰，远远超过同等开放水域排放量下产生的浓度。选择微量金属的浓度抑制了悬浮沉积物的上升。
Northern river breakups are a spectacular process capable of modifying hydrological, geomorphological, and biological regimes. To begin an assessment of the physical and chemical characteristics associated with river-ice breakup, some exploratory field studies were initiated on the Liard River, a large river in northern Canada. The primary objective was to conduct time series measurements of basic water chemistry parameters, suspended sediment concentrations and size, and associated trace elements during the active breakup period. Results show that, although water quality characteristics such as pH and specific conductivity remained relatively constant, dissolved oxygen increased rapidly as breakup progressed and reached a level of supersaturation. Just before breakup, a plume of fine-grained sediment developed leading to very high peak suspended sediment concentrations that far exceeded those produced under equivalent open-water discharge. Concentrations of select trace metal paralleled the rise in suspended sediment.