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首页> 外文期刊>Hydrological Processes >Fine-grained bed sediment storage within the main channel systems of the Frome and Piddle catchments, Dorset, UK
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Fine-grained bed sediment storage within the main channel systems of the Frome and Piddle catchments, Dorset, UK

机译：英国多塞特郡弗罗姆和皮德尔流域主要河道系统内的细颗粒床沉积物存储

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摘要

Lowland permeable catchments in the UK are particularly prone to sedimentation problems, on account of the increased fine sediment loadings generated by recent land-use change and their stable seasonal hydrological regimes, which are frequently depleted by groundwater abstraction. Fine-grained sediment storage on the bed of the main channel systems of the Frome (437 km~2) and Piddle (183 km~2) catchments, Dorset, UK, has been examined at 29 sites using a sediment remobilization technique. Measurements encompassed the period February 2003-July 2004. At individual sites in the Frome, average values ranged between 410 and 2630 g m~(-2), with an overall mean of 918 g~(-2). In the Piddle, the average values for individual sites varied between 260 and 4340 g m~(-2), with an overall mean of 1580 g~(-2). Temporal variations in fine bed sediment storage at each site were appreciable, with the coefficients of variation ranging between 43 and 155% in the Frome and between 33 and 160% in the Piddle. Average reach-scale specific bed sediment storage increased markedly downstream along each main stem from 2 to 29 t km~(-1) (Frome) and from 4 to 19 t km~(-1) (Piddle). Total fine sediment storage on the channel bed of the Frome varied between 479 t (5 t km~(-1)) and 1694 t (17 t km~(-1)), with a mean of 795 t (7 t km~(-1)), compared with between 371 t (5 t km~(-1)) and 1238 t (14 t km~(-1)) with a mean of 730 t (9 t km~(-1)) in the Piddle. During the study period, fine bed sediment storage was typically equivalent to 18% (Frome) and 57% (Piddle) of the mean annual suspended sediment flux at the study catchment outlets.
机译：由于最近的土地利用变化及其稳定的季节性水文状况（通常被地下水抽取所耗尽），英国的低地可渗透集水区特别容易出现沉积问题。在英国多塞特郡的弗罗姆（437 km〜2）和比德尔（183 km〜2）集水区的主要河道系统床上，细颗粒沉积物已通过沉积物固定技术在29个地点进行了检查。测量范围为2003年2月至2004年7月。在弗罗姆的各个地点，平均值介于410至2630 g m〜（-2）之间，总体平均值为918 g〜（-2）。在Piddle中，各个位置的平均值在260和4340 g m〜（-2）之间变化，总平均值为1580 g〜（-2）。每个站点的细床沉积物存储的时间变化是可观的，其变化系数在弗罗姆州介于43％至155％之间，在比德县介于33％至160％之间。沿每个主干的下游平均河床比沉积物显着增加，从2到29 t km〜（-1）（弗罗姆）和从4到19 t km〜（-1）（中间）。弗罗姆河床河床的总细沙沉积量在479 t（5 t km〜（-1））和1694 t（17 t km〜（-1））之间变化，平均为795 t（7 t km〜 （-1）），而371 t（5 t km〜（-1））和1238 t（14 t km〜（-1））之间的平均值为730 t（9 t km〜（-1））在Piddle中。在研究期间，细床沉积物的存储量通常相当于研究集水口的年平均悬浮泥沙通量的18％（弗罗姆）和57％（中位）。

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