Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.

A premise of stream restoration theory and practice is that it is often futile to attempt to restore a stream at the reach scale (101-103 metres) until catchment scale problems have been addressed. This study considers reach scale restoration actions undertaken in Bryan Creek, a sand bed river in so...

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Autores principales:	Alexander J Sims, Ian D Rutherfurd
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a48212bf2eb048e2a8b315e16e6c2643
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spelling	oai:doaj.org-article:a48212bf2eb048e2a8b315e16e6c26432021-12-02T20:10:29ZLocal scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.1932-620310.1371/journal.pone.0252983https://doaj.org/article/a48212bf2eb048e2a8b315e16e6c26432021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0252983https://doaj.org/toc/1932-6203A premise of stream restoration theory and practice is that it is often futile to attempt to restore a stream at the reach scale (101-103 metres) until catchment scale problems have been addressed. This study considers reach scale restoration actions undertaken in Bryan Creek, a sand bed river in south east Australia impacted by a sediment pulse, after catchment sediment sources have been addressed. Local scale interventions, which were in-stream sand extraction, fencing to exclude stock and riparian revegetation, were evaluated by quantifying cross-section and thalweg variability, mapping in-stream and riparian vegetation and by classifying the morphology that emerged following each intervention. Following intervention channel reaches moved to one of three distinct states: simple clay bed, eroding reaches dominated by Juncus acutus, and reaches with deep pools and Phragmites australis. Boundaries between the intervention reaches were sharp, suggesting local scale interventions dominate over catchment scale processes. The magnitude and spread of variability metrics were similar between all reaches and differences in variability bore no relation to intervention type, despite the stark difference in post-intervention morphology. These findings suggest that cross-section and thalweg variability metrics are an inadequate proxy for the effectiveness of local scale interventions in accelerating the recovery of sand bed reaches from a bedload pulse. The most important implications for river managers is that local scale interventions can lead to substantial and rapid improvements in condition, and the change in condition of these reaches is almost independent of other reaches. In this case, the key to the pattern of reach scale geomorphic recovery is excluding stock from waterways so that a specific macrophyte can establish, trap sediment and develop pools.Alexander J SimsIan D RutherfurdPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0252983 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alexander J Sims Ian D Rutherfurd Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.
description	A premise of stream restoration theory and practice is that it is often futile to attempt to restore a stream at the reach scale (101-103 metres) until catchment scale problems have been addressed. This study considers reach scale restoration actions undertaken in Bryan Creek, a sand bed river in south east Australia impacted by a sediment pulse, after catchment sediment sources have been addressed. Local scale interventions, which were in-stream sand extraction, fencing to exclude stock and riparian revegetation, were evaluated by quantifying cross-section and thalweg variability, mapping in-stream and riparian vegetation and by classifying the morphology that emerged following each intervention. Following intervention channel reaches moved to one of three distinct states: simple clay bed, eroding reaches dominated by Juncus acutus, and reaches with deep pools and Phragmites australis. Boundaries between the intervention reaches were sharp, suggesting local scale interventions dominate over catchment scale processes. The magnitude and spread of variability metrics were similar between all reaches and differences in variability bore no relation to intervention type, despite the stark difference in post-intervention morphology. These findings suggest that cross-section and thalweg variability metrics are an inadequate proxy for the effectiveness of local scale interventions in accelerating the recovery of sand bed reaches from a bedload pulse. The most important implications for river managers is that local scale interventions can lead to substantial and rapid improvements in condition, and the change in condition of these reaches is almost independent of other reaches. In this case, the key to the pattern of reach scale geomorphic recovery is excluding stock from waterways so that a specific macrophyte can establish, trap sediment and develop pools.
format	article
author	Alexander J Sims Ian D Rutherfurd
author_facet	Alexander J Sims Ian D Rutherfurd
author_sort	Alexander J Sims
title	Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.
title_short	Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.
title_full	Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.
title_fullStr	Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.
title_full_unstemmed	Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.
title_sort	local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/a48212bf2eb048e2a8b315e16e6c2643
work_keys_str_mv	AT alexanderjsims localscaleinterventionsdominateovercatchmentscalecontrolstoacceleratetherecoveryofadegradedstream AT iandrutherfurd localscaleinterventionsdominateovercatchmentscalecontrolstoacceleratetherecoveryofadegradedstream
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Local scale interventions dominate over catchment scale controls to accelerate the recovery of a degraded stream.

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