Hydrological and geomorphic effects upstream of the Cantillana Dam along the Guadalquivir River (southern Spain)

Baena-Escudero, Rafael; Amador, Inmaculada Guerrero; Rinaldi, Massimo; González-Sayago, Alberto

doi:10.1016/j.geomorph.2021.107786

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…The time of extreme low water levels has changed, while the time of extreme high water levels has decreased ( Wang et al, 2015 ). Changes in the hydrological regime result in increases in water area and the inundation frequency upstream of the dam, while decreasing the fluctuation range in the riparian area ( Baena-Escudero et al, 2021 ). However, the river downstream of a dam becomes a dry riverbed under long periods of water shortage.…”

Section: Discussionmentioning

confidence: 99%

Effects of South-to-North Water Diversion Project Cascade Dams on Riparian Vegetation Along the Middle and Lower Reaches of the Hanjiang River, China

Yang

et al. 2022

Front. Plant Sci.

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The influence of the construction of dams for water diversion on the ecological environment has attracted recent widespread attention. Over time, dams have emerged as one of the most important factors affecting the vegetation along the riparian zones of rivers. To elucidate the effects of cascade dams on riparian vegetation along the middle and lower reaches of the Hanjiang River, we examined riparian vegetation types upstream and downstream from dams. A total of 14 sample sites and 131 quadrats perpendicular to the river were investigated in June 2019, and 14 sample sites and 134 quadrats were investigated in October 2019. The riparian vegetation was divided into 15 (in June) and 11 (in October) vegetation types by two-way indicator species analysis (TWINSPAN). Significant differences were found between the vegetation types upstream and downstream of dams. Redundancy analysis (RDA) showed that soil moisture content, distance from the water, altitude and soil total nitrogen (TN) were the main environmental factors affecting plants distributions, and soil moisture content was the main factor affecting the zonal distribution of vegetation. By analyzing the impact of cascade dams on the hydrological regime, we found that the construction of cascade dams led to the differentiation of vegetation types upstream and downstream of the dam, and the riparian habitats were fragmented by these dams. This study provides both an important reference for the protection of riparian vegetation and riparian ecosystems and a basis for the management and restoration of river ecosystems after the construction of cascade dams.

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Section: Discussionmentioning

confidence: 99%

Effects of South-to-North Water Diversion Project Cascade Dams on Riparian Vegetation Along the Middle and Lower Reaches of the Hanjiang River, China

Yang

et al. 2022

Front. Plant Sci.

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“…Last, GIS analysis of riverbed planform dynamics over time has usually considered well-established morphometric indices and parameters mainly focusing on channel width, sinuosity, and braiding e.g., [9,13,15,34,41,53,122,123]. Less attention has been given to channel shifting [42,45,98,103,106,107], and very few studies have investigated bank migration in relation to both active-channel dimension change and active-channel horizontal displacement [45,98,107].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Riverbed Planform Adjustments, Channelization, and Associated Land Use/Land Cover Changes: The Ingauna Alluvial-Coastal Plain Case (Liguria, Italy)

et al. 2021

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The active-channel planform adjustments that have occurred along the Centa, lower Arroscia and lower Neva rivers since 1930, along with the riverbed channelization processes and the land-use and land-cover changes in disconnected riverine areas, were investigated through a multitemporal analysis based on remote sensing and geographical information systems (GIS). These watercourses flow through the largest Ligurian alluvial-coastal plain in a completely anthropogenic landscape. This research is based on the integrated use of consolidated and innovative metrics for riverbed planform analysis. Specific indices were introduced to assess active-channel lateral migration in relation to the active-channel area abandonment and formation processes. The Arroscia and Neva riverbeds experienced narrowing, progressive stabilization, and braiding phenomena disappearance from 1930 to the early 1970s, and then slight narrowing up to the late 1980s. Subsequently, generalized stability was observed. Conversely, the Centa was not affected by relevant planform changes. Recently, all rivers underwent a slight to very slight width increase triggered by the November 2016 high-magnitude flood. The active-channel adjustments outlined in this paper reflect the relevant role in conditioning the river morphology and dynamics played by channelization works built from the 1920s to the early 1970s. They (i) narrowed, straightened, and stabilized the riverbed and (ii) reduced the floodable surface over the valley-floor. Thus, large disconnected riverine areas were occupied by human activities and infrastructures, resulting in a progressive increase in vulnerable elements exposed to hydrogeomorphic hazards. The outlined morphological dynamics (i) display significant differences in terms of chronology, type, and magnitude of active-channel planform adjustments with respect to the medium- and short-term morphological evolution of most Italian rivers and (ii) reflect the widespread urbanization of Ligurian major valley floors that occurred over the 20th century. The outcomes from this study represent an essential knowledge base from a river management perspective; the novel metrics enlarge the spectrum of available GIS tools for active-channel planform analysis.

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“…Hydrological effects upstream of dams have been less commonly studied (Petts, 1980;Evans et al, 2007;Baena-Escudero et al, 2021). In the short term, water regulation raises the water level for riparian forests upstream of a dam in the portion of the river under the influence of the dam (reservoir) resulting in forest mortality or composition change (Nilsson and Berggren, 2000), or in the loss of trees/species presenting flood rings.…”

Section: Introductionmentioning

confidence: 99%

“…In the longer term, a dam can also cause progressive siltation reducing the river cross-section upstream of the dam. For example, Baena-Escudero et al (2021) demonstrated that the siltation induced by dams on the Guadalquivir River in Spain, laden with silty sand sediments, resulted in a reduction in the discharge capacity of the river during floods less than 100 years after the dams were built. As a result, higher water levels were reached after siltation, for an equivalent discharge before siltation, increasing the frequency and duration of flooding of the floodplains along the reservoir (Baena-Escudero et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…For example, Baena-Escudero et al (2021) demonstrated that the siltation induced by dams on the Guadalquivir River in Spain, laden with silty sand sediments, resulted in a reduction in the discharge capacity of the river during floods less than 100 years after the dams were built. As a result, higher water levels were reached after siltation, for an equivalent discharge before siltation, increasing the frequency and duration of flooding of the floodplains along the reservoir (Baena-Escudero et al, 2021). Slater and Villarini (2016) also noted that trends in flood frequencies among American rivers were different for some river basins that had undergone regulation or reduction in the capacity of the main river channel (urbanization).…”

Section: Introductionmentioning

confidence: 99%

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Flood-Rings Production Modulated by River Regulation in Eastern Boreal Canada

2021

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In northeastern boreal Canada, the long-term perspective on spring flooding is hampered by the absence of long gage records. Changes in the tree-ring anatomy of periodically flooded trees have allowed the reconstruction of historical floods in unregulated hydrological systems. In regulated rivers, the study of flood rings could recover past flood history, assuming that the effects of hydrological regulation on their production can be understood. This study analyzes the effect of regulation on the flood-ring occurrence (visual intensity and relative frequency) and on ring widths in Fraxinus nigra trees growing at five sites distributed along the Driftwood River floodplain. Driftwood River was regulated by a dam in 1917 that was replaced at the same location in 1953. Ring width revealed little, to no evidence, of the impact of river regulation, in contrast to the flood rings. Prior to 1917, high relative frequencies of well-defined flood rings were recorded during known flood years, as indicated by significant correlations with reconstructed spring discharge of the nearby Harricana River. After the construction and the replacement of the dam, relative frequencies of flood rings and their intensities gradually decreased. Flood-ring relative frequencies after 1917, and particularly after 1953, were mostly composed of weakly defined (less distinct) flood rings with some corresponding to known flood years and others likely reflecting dam management. The strength of the correlations with the instrumental Harricana River discharge also gradually decrease starting after 1917. Compared with upper floodplain trees, shoreline trees at each site recorded flood rings less frequently following the construction of the first but especially of the second dam, indicating that water level regulation limited flooding in the floodplains. Compared with the downstream site to the dam, the upstream ones recorded significantly more flood rings in the postdam period, reemphasizing the importance of considering the position of the site along with the river continuum and site conditions in relation to flood exposure. The results demonstrated that sampling trees in multiple riparian stands and along with various hydrological contexts at a far distance of the dams could help disentangle the flooding signal from the dam management signal.

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Hydrological and geomorphic effects upstream of the Cantillana Dam along the Guadalquivir River (southern Spain)

Cited by 6 publications

References 39 publications

Effects of South-to-North Water Diversion Project Cascade Dams on Riparian Vegetation Along the Middle and Lower Reaches of the Hanjiang River, China

Effects of South-to-North Water Diversion Project Cascade Dams on Riparian Vegetation Along the Middle and Lower Reaches of the Hanjiang River, China

Quantitative Assessment of Riverbed Planform Adjustments, Channelization, and Associated Land Use/Land Cover Changes: The Ingauna Alluvial-Coastal Plain Case (Liguria, Italy)

Flood-Rings Production Modulated by River Regulation in Eastern Boreal Canada

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