Turbidity dynamics during spring storm events in an urban headwater river system: The Upper Tame, West Midlands, UK

Lawler, Damian; Petts, Geoffrey E.; Foster, Ian D L; Harper, Sue E.

doi:10.1016/j.scitotenv.2005.08.032

Cited by 285 publications

(283 citation statements)

References 43 publications

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“…Heppell et al 2009; 66,800 g m −2 ) while low values are found in small urbanised catchments (e.g. West Midlands, Lawler et al 2006;50-110 g m −2 ) and chalk streams (Acornley and Sear 1999). In the upper Ehen, average storage ranged from 224 (T1) to 907 g m −2 (T9) and included all particles between 0.012 and 2 mm.…”

Section: In-channel Sediment Storagementioning

confidence: 99%

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

et al. 2018

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Purpose A disconnected ephemeral tributary was reconnected to the regulated River Ehen (NW England) as part of a river restoration initiative, providing a renewed delivery of sediment to a highly stable and armoured channel. This paper (1) assesses spatial and temporal dynamics of suspended and stored sediments in the Ehen, (2) characterises the composition of stored sediment, (3) develops fine sediment budgets for downstream river reaches, and (4) assesses the controls on the storage of fine sediment in the riverbed. Materials and methods A 3-km study section in the upper part of the River Ehen was divided into two reaches. Suspended sediments were monitored at the downstream limits of each reach over a 2-year period. In-channel storage was measured in three morphological units within the upper reach, on 13 occasions over the same period. Samples were used to assess changes in volumes of stored fine sediment, as well as the grain sizes and organic content of the material. A time-lapse camera facing the confluence of the tributary was used to conceptualise different flow scenarios. These scenarios reflect the degree of synchronicity between flows in the main-stem and those in the tributary. Fine sediment budgets were developed for each reach to assess the relative contribution of different sources of sediment. Results and discussion The reconnection significantly affected suspended sediment loads in the Ehen. Bed storage increased twofold, with changes most evident in the slow-flowing morphological unit. Changes in the composition of stored sediment were less marked than changes in the quantity of material. Changes in bed storage were controlled by the degree of synchronicity between flows in the Ehen and those in the newly reconnected tributary. Results show that three generalised flow scenarios occur, with total asynchronicity between flows in the tributary and the Ehen being responsible for the main episodes of fine sediment deposition. Overall, the estimated sediment budgets provide insights into the importance of non-perennial sources of sediment in supply-limited systems such as the Ehen. Although bed storage values are within the range of those published for UK rivers, the increase observed since the reconnection, together with the persistence of a static pavement, highlights the ecologically critical conditions of the regulated main-stem River Ehen. Conclusions Intermittent sources control fine sediment transport dynamics in the upper River Ehen. In this regulated river, ongoing deposition associated with increased low-and medium-sized flow events exerts more of a control on bed storage than large but rare floods. Management actions to limit delivery of material from lateral sources could help prevent further deterioration of habitat conditions for biota sensitive to fine sediment. Given the ongoing adjustment in the newly reconnected tributary, continued monitoring is needed to capture further morphosedimentary response in the main-stem.

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Section: In-channel Sediment Storagementioning

confidence: 99%

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

et al. 2018

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“…USDH48) and filtration of river waters to obtain actual SSC for particle size distribution analysis and to calibrate turbidity meters to provide SSC data 3 Supplementary automatic monitoring -and automatic sampling -to deliver the ideal high frequency measurements of changing turbidity and SSC before, through and after storms and floods (e.g. Lawler and Brown, 1992;Lawler et al, 2006a;Old et al, 2005). This is essential to capture the full fluvial sediment transport response to catchment rainfall events and meltwater inputs to feed into hydroecological impact work -and also to detect river disturbance and elevated SSCs through the development process, such as from pipeline river crossing activities.…”

Section: Methodological Stepsmentioning

confidence: 99%

“…opposite to the classic first-flush hypothesis. Here, most of the fine sediment is coming through late in the storm, after the flow peak, and Lawler et al (2006aLawler et al ( , 2006b found this to be the characteristic dynamic for this urban system. Amongst other causes (Lawler, in prep.…”

Section: Fine Sediment Impacts and Ecological Implicationsmentioning

confidence: 95%

Untitled

2016

Hrv. geogr. glas.

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Voda onečišćena finim sedimentom može biti velika opasnost za zdravlje ljudi i okoliš. No u studijama utjecaja na okoliš i stanovništvo komplicirano je i teško procijeniti utjecaje sedimenta, osobito kad je riječ o kratkim razdobljima. U radu se opisuje novi procesni okvir -procjena utjecaja riječnih sedimenata, Fluvial Sediment Impact Assessment (FSIA) -osmišljen za predviđanje i analizu problema onečišćenja riječnim sedimentima koji potječu od građevinskih projekata. Postavljaju se tri opća načela, šest metodoloških koraka i nekoliko tehničkih pristupa na kojima se okvir temelji.Prednosti su okvira sljedeće: temelji se na procesima, izričito se oslanja na dinamiku sedimenta, uključuje eksplicitne referencije za ekološke receptore, služi se općeprihvaćenim protokolima bionadzora, potiče multidisciplinaran pristup te se zasniva na bogatom iskustvu u velikim građevinskim projektima. Novi okvir nudi velik potencijal strože procjene stanja riječnog sedimenta prije, tijekom i nakon građevinske aktivnosti, primjerice polaganja naftnih i plinskih cjevovoda u rijeke.Ključne riječi: fini sedimenti, procjena utjecaja riječnih sedimenata, bionadzor, agroekologija, hidrologija Water contaminated with fine sediment can be a primary risk to human and ecological health. Sediment impacts are, however, complex and difficult to assess in environmental and social impact assessments, especially where timescales are short. We outline a new process-based framework -Fluvial Sediment Impact Assessment (FSIA) -designed to anticipate and address sediment pollution problems in rivers which may result from development projects. We establish three general principles, six methodological steps, and several technical approaches that underpin the framework.Advantages of the framework are that: it is process-based; it explicitly recognises sediment dynamics; it includes explicit reference to ecological receptors; it capitalises on well-established biomonitoring protocols; it encourages multi-disciplinary involvement; and it is based on substantial experience of major development projects. The new framework offers significant potential for more rigorous assessment of fluvial sediment conditions, before, during and after development activity, such as oil and gas pipeline crossings.

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“…O formato do laço de histerese pode ser quantificado a partir da metodologia apresentada por Lawler et al (2006). O índice de histerese -IH, é obtido a partir da análise dos dados de vazão -Q e CSS e da construção do gráfico de Q versus CSS; primeiro, conhecendo-se a vazão máxima -Q max e a vazão inicial mínima -Q min do evento, calculase o valor central entre a vazão máxima e mínima do ramo ascendente -Q cen do evento (Eq.…”

Section: Análise Quantitativa Da Histereseunclassified

“…O valor do índice de histerese -IH, tende a reduzir durante uma sequência de eventos devido ao aumento do conteúdo de água no solo, determinando que novas fontes de sedimentos sejam incorporadas a toda a bacia vertente (Lawler et al, 2006). Outra razão é a intensificação da atividade agrícola que condiciona a um aumento da disponibilidade de sedimentos pelo revolvimento do solo e geração de depósitos próximos e dentro do canal fluvial (Bowes et al, 2005).…”

Section: Ih = (-1 / (Css Rc / Css Rd)) +unclassified

Análise qualitativa e quantitativa da histerese entre vazão e concentração de sedimentos durante eventos hidrológicos

Minella

Merten

Magnago

2011

Rev. bras. eng. agríc. ambient.

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R ESU M OA relação entre a vazão -Q e a concentração de sedimentos em suspensão -CSS, apresenta padrões temporais complexos durante eventos de chuva governados pela geomorfologia, uso e manejo do solo e precipitação. Este fato tem implicações relevantes no entendimento e na descrição dos processos erosivos e de produção de sedimentos em bacias, padrões que podem ser avaliados pelas características da histerese entre a CSS e a Q. Neste estudo foi analisado o efeito histerese de 19 eventos de chuva-vazão em uma bacia agrícola, no sul do Brasil; os eventos foram separados em duas fases distintas em relação ao manejo do solo, com e sem a utilização de práticas de conservação de solos. O conjunto de eventos foi classificado segundo o tipo de histerese e calculado o valor de um índice de histerese (IH) para avaliar a magnitude desta defasagem. Os resultados mostram que o padrão de histerese foi de laço no sentido horário para os dois momentos, representando uma rápida mobilização e transferência de sedimentos na bacia. Em relação ao IH verificou-se que, apesar de não diferir estatisticamente entre os dois momentos, existem evidências de que as práticas de conservação de solos influenciaram sua variabilidade. Palavras-chave: bacia hidrográfica, monitoramento ambiental, hidrossedimentologiaQualitative and quantitative analysis of hysteresis between sediment concentration and flow rate during hydrologic events A B ST R A C TThe relationship between flow rate -Q and suspended sediment concentration -SSC demonstrates complex temporal patterns during hydrologic events, which are governed by geomorphology, land use, soil management and rainfall. This fact has important implications for understanding and describing erosive processes and sediment production in catchments. These patterns can be evaluated by their loop hysteresis characteristics on the graph of SSC vs. Q. In this study, the hysteresis effect was analyzed for 19 rainfall events in a rural catchment in Southern Brazil. The events were separated in two groups in relation to soil management (with and without soil management practices). The events were classified according to the type of hysteresis, and a hysteresis index (HI) was calculated to evaluate the magnitude of the difference in phase. Results show that the hysteresis pattern was a clockwise loop, indicating that the peak SSC occurred before the peak Q, which represents rapid mobilization and transfer of sediment in the catchment. The HI was not statistically different between the two periods studied, although there is evidence that the conservation practices do have some influence on the index.

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Turbidity dynamics during spring storm events in an urban headwater river system: The Upper Tame, West Midlands, UK

Cited by 285 publications

References 43 publications

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

Untitled

Análise qualitativa e quantitativa da histerese entre vazão e concentração de sedimentos durante eventos hidrológicos

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