{"title":"Stream Level Stabilization by Algae of the Genus Cladophora","authors":"J. Zeman, Š. Dvořáková","doi":"10.2478/sab-2018-0006","DOIUrl":null,"url":null,"abstract":"Abstract Investigations in the Pryský brook experimental catchment revealed that the vegetation of the stream channel stabilizes water level depth in the measured profile. The explored brook has been heavily overgrown by algae of the genus Cladophora due to a strong pollution by nitrates. It seems that if the algae average length exceeds the midsize of the stones paving the bed (ca. 30 ± 7 cm in diameter, escribed circle to pentagon or heptagon), the water level stagnates in the flowrate range of 60–180 l s−1. This totally blocks the streamflow daily oscillation (in summer months in a purely stone bed reaching up to 15%, along with tidal phenomena). The article analyzes one of possible explanations of this effect due to the dependence of the algae thickness layer modifying the channel bed cross-section on the speed of flowing water.","PeriodicalId":53537,"journal":{"name":"Scientia Agriculturae Bohemica","volume":"49 1","pages":"32 - 37"},"PeriodicalIF":0.0000,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scientia Agriculturae Bohemica","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2478/sab-2018-0006","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Agricultural and Biological Sciences","Score":null,"Total":0}
引用次数: 0
Abstract
Abstract Investigations in the Pryský brook experimental catchment revealed that the vegetation of the stream channel stabilizes water level depth in the measured profile. The explored brook has been heavily overgrown by algae of the genus Cladophora due to a strong pollution by nitrates. It seems that if the algae average length exceeds the midsize of the stones paving the bed (ca. 30 ± 7 cm in diameter, escribed circle to pentagon or heptagon), the water level stagnates in the flowrate range of 60–180 l s−1. This totally blocks the streamflow daily oscillation (in summer months in a purely stone bed reaching up to 15%, along with tidal phenomena). The article analyzes one of possible explanations of this effect due to the dependence of the algae thickness layer modifying the channel bed cross-section on the speed of flowing water.
摘要对Pryskýbrook实验集水区的调查表明，河道植被稳定了测量剖面中的水位深度。由于硝酸盐的强烈污染，被勘探的小溪中长满了枝藻属的藻类。似乎，如果藻类的平均长度超过铺设河床的石头的中等大小（直径约为30±7厘米，描述为圆形到五边形或七边形），水位将停滞在60–180 l s−1的流量范围内。这完全阻断了径流的日振荡（在夏季的几个月里，在纯石床上，流量高达15%，还有潮汐现象）。文章分析了这种影响的可能解释之一，因为藻类厚度层改变了河床横截面对水流速度的依赖性。
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