Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile

Vera, Macarena; Jara, Carlos G.; Iroumé, Andrés; Ulloa, Héctor; Andreoli, Andrea; Barrientos, S Luis

doi:10.4067/s0717-65382014000200002

Cited by 8 publications

(7 citation statements)

References 38 publications

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“…More abundant research has developed since 2007 focusing mainly on LW morphologic and hydraulic roles (Andreoli et al, 2007;Comiti et al, 2008;Mao et al, 2008Mao et al, , 2013Cadol et al, 2009;Wohl et al, 2009Wohl et al, , 2012Cadol and Wohl, 2010;Iroumé at al., 2010Iroumé at al., , 2011Iroumé at al., , 2014Ulloa et al, 2011) and also on the ecology of low-order mountain channels (Vera et al, 2014). First analyses of LW mobilization in Latin American streams are the reports by Andreoli et al (2008), Mao et al (2008), andIroumé et al (2011).…”

Section: Accepted Manuscriptmentioning

confidence: 97%

“…In Vuelta de Zorra reaches 6 to 9, and especially reach 8, experienced most of the movement during the study period. These reaches feature an average LW volume of 243 m 3 /ha of bankfull channel, while the average LW volume in the segment is 109 m 3 /ha (Iroumé et al, 2014), have between 2 and 5 logjams, while all the other reaches have ≤ 2 logjams, and on average, stream channel in these reaches is wider (at bankfull level) and less steep than mean segment bankfull width and longitudinal slope (Ruz, 2013). In the Tres Arroyos, LW movement is concentrated mainly in reaches 8 to 10 with an average stock of 1288 m 3 /ha of LW, while the mean segment LW volume is 1057 m 3 /ha (Iroumé et…”

Section: Accepted Manuscriptmentioning

confidence: 98%

“…Considering the channel bankfull area as a reference, LW volume in this 2.07-km-long segment is 1057 m 3 /ha (Iroumé et al, 2014). This extended segment was again surveyed after consecutive rainy winter periods at the end of 2009, 2010, 2011, and 2012; and every tagged wood piece that had moved from its initial position was re-referenced and reclassified as described above.…”

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Large wood mobility processes in low-order Chilean river channels

et al. 2015

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Large wood (LW) mobility was studied over several time periods in channel segments of four low-order mountain streams, southern Chile. All wood pieces found within the bankfull channels and on the streambanks extending into the channel with dimensions more A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 than 10 cm in diameter and 1 m in length were measured and their position was referenced.Thirty six percent of measured wood pieces were tagged to investigate log mobility. All segments were first surveyed in summer and then after consecutive rainy winter periods.Annual LW mobility ranged between 0 and 28%. Eighty-four percent of the moved LW had diameters ≤ 40 cm and 92% had lengths ≤ 7 m. Large wood mobility was higher in periods when maximum water level (H max ) exceeded channel bankfull depth (H Bk ) than in periods with flows less than H Bk , but the difference was not statistically significant.Dimensions of moved LW showed no significant differences between periods with flows exceeding and with flows less than bankfull stage. Statistically significant relationships were found between annual LW mobility (%) and unit stream power (for H max ) andH max /H Bk . The mean diameter of transported wood pieces per period was significantly correlated with unit stream power for H 15% and H 50% (the level above which the flow remains for 15 and 50% of the time, respectively). These results contribute to an understanding of the complexity of LW mobilization processes in mountain streams and can be used to assess and prevent potential damage caused by LW mobilization during floods.

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Section: Accepted Manuscriptmentioning

confidence: 97%

Section: Accepted Manuscriptmentioning

confidence: 98%

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Large wood mobility processes in low-order Chilean river channels

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“…Logs, especially if jammed, can create steps (Rosenfeld and Huato, ), increase flow resistance (Cadol and Wohl, ), store organic matter (Beckman and Wohl, ; Tank et al ., ), and increase the connectivity with floodplains (Sear et al ., ). It has also been demonstrated that in‐channel wood increases habitats and biological diversity (Cordova et al ., ; Gerhard and Reich, ; Vera et al ., ), principally by augmenting morphological diversity and complexity (Gurnell et al ., ). Indeed, the presence of LW can increases fish number and biomass (e.g.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Replacing Native Forest on the Quantity and Impacts of In‐Channel Pieces of Large Wood in Chilean Streams

Mao

Ugalde

Iroumé

et al. 2016

River Research & Apps

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Dead trees in rivers can significantly affect their morphological and ecological properties by increasing flow resistance, affecting sediment transport, and storing organic matter. Logs are usually recruited from banks or along the entire upstream basin. Although it is generally acknowledged that forested headwater streams feature higher volumes of in-channel pieces of large wood, the influence of forest type and forest management of the potential recruitment zone on the volumes and effects of wood have been less explored, especially in relation to the effects of replacing native forests with pine plantations. This paper presents a comparison of volumes of wood, and characteristics and effects on streams draining paired basins with comparable slopes, areas, and hydrologic regimes, but different in terms of land use. The five selected pairs of basins are located in the Coastal and Andean mountain Ranges in central Chile, in order to compare native forest and pine plantation basins. The results show that logs tend to be shorter and with larger diameters in streams draining native forest basins. Because of their smaller dimensions, logs and jams tend to be more mobile and oriented parallel to the flow. Volumes of in-channel wood in native forest basins are only slightly larger than in pine plantation basins, and no differences have been identified in terms of morphological effects on channel geometry. Also, fish type and biomass were comparable among pairs. Evidence highlights the importance of the width of riparian buffers in mitigating the effects of land use change, especially the substitution of native forest with plantations.

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“…KEYWORDS channel morphology, displacement length, large wood dynamics, mountain streams 1 | INTRODUCTION Understanding large wood (hereafter referred to as LW, i.e., wood pieces at least 1 m in length and at least 10 cm in diameter) dynamics in rivers is critical for many disciplines including those addressing flood hazard and risk assessments. Moreover, the geomorphic (Beechie & Sibley, 1997;Chen, Wei, Scherer, & Hogan, 2008;Robison & Beschta, 1990) and ecological (Chen et al, 2008;Diez, Elosegi, & Pozo, 2001; Vera, Jara, Iroumé, Ulloa, & Barrientos, 2014) significance of LW on stream ecosystems is widely recognized. LW is a key component of river systems, and although LW removal from stream channels has been a very common management strategy during past centuries (Wohl, 2014), this paradigm is now changing in such a way that wood is often reintroduced to watercourses as a river restoration technique (Buxton, 2010;Kail, 2003;Roni, Beechie, Pess, & Hanson, 2015).…”

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Geomorphic and stream flow influences on large wood dynamics and displacement lengths in high gradient mountain streams (Chile)

Iroumé

Ruíz-Villanueva

Mao

et al. 2018

Hydrological Processes

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Understanding large wood (LW; ≥1 m long and ≥10 cm in diameter) dynamics in rivers is critical for many disciplines including those assessing flood hazard and risk. However, our understanding of wood entrainment and deposition is still limited, mainly because of the lack of long‐term monitoring of wood‐related processes. The dataset presented here was obtained from more than 8 years of monitoring of 1,264 tagged wood pieces placed in 4 low‐order streams of the Chilean mountain ranges and was used to further our understanding of key factors controlling LW dynamics. We show that LW displacement lengths were longer during periods when peak‐flow water depths (Hmax) exceeded the bankfull stage (HBk) than in periods with Hmax ≤ HBk and that these differences were significantly higher for smaller wood pieces. LW length and length relative to channel dimensions were the main factors governing LW entrainment; LW displacement lengths were inversely related to the ratio of piece length to H15% (i.e., the level above which the flow remains for 15% of the time) and to the ratio of H15% to bankfull width. Unrooted logs and LW pieces located at the bankfull stage travelled significantly longer distances than logs with attached rootwads and those located in other positions within the bankfull channel. A few large logjams were broken during the period of observation, and in all occasions, LW from these broken logjams did not travel over longer distances than other pieces of LW moved in the same periods and in the same stream segments. Most importantly, our work reveals that LW dynamics tend to be concentrated within a few reaches in each stream and that reaches exhibiting high wood dynamics (extensive entrainment, deposition, or repositioning of LW) are significantly wider and less steep than less dynamic reaches.

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Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile

Cited by 8 publications

References 38 publications

Large wood mobility processes in low-order Chilean river channels

Large wood mobility processes in low-order Chilean river channels

The Effects of Replacing Native Forest on the Quantity and Impacts of In‐Channel Pieces of Large Wood in Chilean Streams

Geomorphic and stream flow influences on large wood dynamics and displacement lengths in high gradient mountain streams (Chile)

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