River channel adjustments in Southern Italy over the past 150 years and implications for channel recovery

Abstract Multi-temporal GIS analysis of topographic maps and aerial photographs along with topographic and geomorphological surveys are used to assess evolutionary trends and key control factors of channel adjustments for five major rivers in southern Italy (the Trigno, Biferno, Volturno, Sinni and Crati rivers) to support assessment of channel recovery and river restoration. Three distinct phases of channel adjustment are identified over the past 150 years primarily driven by human disturbances. Firstly, slight channel widening dominated from the last decades of the nineteenth century to the 1950s. Secondly, from the 1950s to the end of the 1990s, altered sediment fluxes induced by in-channel mining and channel works brought about moderate to very intense incision (up to 6–7 m) accompanied by strong channel narrowing (up to 96%) and changes in channel configuration from multi-threaded to single-threaded patterns. Thirdly, the period from around 2000 to 2015 has been characterized by channel stabilization and local widening. Evolutionary trajectories of the rivers studied are quite similar to those reconstructed for other Italian rivers, particularly regarding the second phase of channel adjustments and ongoing transitions towards channel recovery in some reaches. Analyses of river dynamics, recovery potential and connectivity with sediment sources of the study reaches, framed in their catchment context, can be used as part of a wider interdisciplinary approach that views effective river restoration alongside sustainable and risk-reduced river management.

[1]  P. Aucelli,et al.  Recent changes in rainfalland air temperature at Agnone(Molise - Central Italy) , 2004 .

[2]  M. Amsler,et al.  Morphologic changes in the Paraná River channel (Argentina) in the light of the climate variability during the 20th century , 2005 .

[3]  P. Aucelli,et al.  Hydromorphology Meets Mammal Ecology: River Morphological Quality, Recent Channel Adjustments and Otter Resilience , 2016 .

[4]  A. Gibon,et al.  Agricultural abandonment in mountain areas of Europe: Environmental consequences and policy response , 2000 .

[5]  M. Polemio,et al.  Climate change, drought and groundwater availability in southern Italy , 2008 .

[6]  K. Fryirs,et al.  River futures : an integrative scientific approach to river repair , 2008 .

[7]  N. Surian,et al.  Sediment mining in alluvial channels: physical effects and management perspectives , 2005 .

[8]  P. Bellotti.  Il modello morfo-sedimentario dei maggiori delta tirrenici italiani , 2000 .

[9]  P. Magliulo,et al.  Recent geomorphological changes of the middle and lower Calore River (Campania, Southern Italy) , 2013, Environmental Earth Sciences.

[10]  J. Hooke.  Coarse sediment connectivity in river channel systems: a conceptual framework and methodology , 2003 .

[11]  Michele Brunetti,et al.  Changes in daily precipitation frequency and distribution in Italy over the last 120 years , 2004 .

[12]  F. Tichy.  Die Wälder der Basilicata und die Entwaldung im 19. Jahrhundert : Vorgänge, Ursachen und Folgen , 1962 .

[13]  N. Surian,et al.  Morphological response to river engineering and management in alluvial channels in Italy , 2003 .

[14]  Ramon J. Batalla,et al.  Response of a river sediment budget after historical gravel mining (the lower Tordera, NE Spain) , 2005 .

[15]  G. Petts.  Complex response of river channel morphology subsequent to reservoir construction , 1979 .

[16]  G. Barker.  The Biferno Valley survey : the archaeological and geomorphological record , 1995 .

[17]  C. Sanchis‐Ibor,et al.  Assessment of channel changes in a Mediterranean ephemeral stream since the early twentieth century. The Rambla de Cervera, eastern Spain , 2013 .

[18]  P. Ward,et al.  Modeling the sensitivity of sediment and water runoff dynamics to Holocene climate and land use changes at the catchment scale , 2011 .

[19]  Hervé Piégay,et al.  A review of techniques available for delimiting the erodible river corridor: a sustainable approach to managing bank erosion , 2005 .

[20]  M. Rinaldi.  Recent channel adjustments in alluvial rivers of Tuscany, central Italy , 2003 .

[21]  C. Hupp,et al.  Riparian Vegetation Patterns in Relation to Fluvial Landforms and Channel Evolution Along Selected Rivers of Tuscany (Central Italy) , 2007 .

[22]  H. Piégay,et al.  Changes in the riparian zone of the lower Eygues River, France, since 1830 , 2007, Landscape Ecology.

[23]  K. Fryirs,et al.  Don’t Fight the Site: Three Geomorphic Considerations in Catchment-Scale River Rehabilitation Planning , 2009, Environmental management.

[24]  Domenico Capolongo,et al.  Changes in daily precipitation extremes in the Mediterranean from 1951 to 2010: the Basilicata region, southern Italy , 2013 .

[25]  K. Fryirs,et al.  Buffers, barriers and blankets : the (dis)connectivity of catchment-scale sediment cascades , 2007 .

[26]  P. Downs,et al.  Applying fluvial geomorphology to river channel management: Background for progress towards a palaeohydrology protocol , 2008 .

[27]  Hervé Piégay,et al.  Scientific design strategy for promoting sustainable sediment management: the case of the Magra River (Central‐Northern Italy) , 2009 .

[28]  M. Dotterweich.  The history of soil erosion and fluvial deposits in small catchments of central Europe: Deciphering the long-term interaction between humans and the environment — A review , 2008 .

[29]  M. Mancini,et al.  Precipitation change in Southern Italy linked to global scale oscillation indexes , 2009 .

[30]  Luca Ziliani,et al.  Evolutionary trajectory of channel morphology and controlling factors in a large gravel-bed river , 2012 .

[31]  G. Brierley,et al.  A critical review of catchment-scale stream rehabilitation programmes , 2005 .

[32]  M. Wolman,et al.  Downstream effects of dams on alluvial rivers. , 1984 .

[33]  M. Rǎdoane,et al.  Changes in the channel-bed level of the eastern Carpathian rivers: Climatic vs. human control over the last 50 years , 2013 .

[34]  T. Caloiero,et al.  Precipitation variability and change in the Calabria region (Italy) from a high resolution daily dataset , 2012 .

[35]  N. Surian,et al.  Channel adjustments and vegetation cover dynamics in a large gravel bed river over the last 200 years , 2011 .

[36]  K. Fryirs,et al.  Post‐European settlement response gradients of river sensitivity and recovery across the upper Hunter catchment, Australia , 2009 .

[37]  K. Tockner,et al.  Habitat change in braided flood plains (Tagliamento, NE-Italy) , 2003 .

[38]  L. B. Leopold.  RIVER CHANNEL CHANGE WITH TIME: AN EXAMPLE , 1973 .

[39]  K. Fryirs,et al.  Catchment-scale (dis)connectivity in sediment flux in the upper Hunter catchment, New South Wales, Australia , 2007 .

[40]  N. Surian,et al.  Multi-thread river channels: A perspective on changing European alpine river systems , 2009, Aquatic Sciences.

[41]  K. Gregory.  The human role in changing river channels , 2006 .

[42]  N. Surian,et al.  Geomorphological Approaches for River Management and Restoration in Italian and French Rivers , 2013 .

[43]  B. Wyżga,et al.  Channel incision and flow increase of the upper Wisłoka River, southern Poland, subsequent to the reafforestation of its catchment , 2002 .

[44]  Peter W. Downs,et al.  River Channel Management: Towards sustainable catchment hydrosystems , 2004 .

[45]  A. Knighton.  Channel bed adjustment along mine-affected rivers of northeast Tasmania , 1991 .

[46]  Evan H. Girvetz,et al.  Landscape level planning in alluvial riparian floodplain ecosystems: Using geomorphic modeling to avoid conflicts between human infrastructure and habitat conservation , 2007 .

[47]  E. Tondi,et al.  Complex basin development in a wrench-dominated back-arc area: Tectonic evolution of the Crati Basin, Calabria, Italy , 2011 .

[48]  R. Marston,et al.  Impacts of reforestation and gravel mining on the Malnant River, Haute-Savoie, French Alps , 2003 .

[49]  T. Kiss,et al.  River channel response to climate- and human-induced hydrological changes: Case study on the meandering Hernád River, Hungary , 2012 .

[50]  Mark G. Macklin,et al.  Channel and floodplain response to recent abrupt climate change: The tyne basin, Northern England , 1994 .

[51]  S. Baranello,et al.  Stratigrafia ed assetto geometrico dell'Unità del Sannio nel settore settentrionale dei monti del Matese , 2011 .

[52]  S. Keesstra,et al.  Evolution of the Morphology of the River Dragonja (SW Slovenia) due to Land-Use Changes , 2005 .

[53]  Massimo Rinaldi,et al.  Channel adjustments in northern and central Italy over the last 200 years , 2009 .

[54]  K. Fryirs,et al.  River Styles, a Geomorphic Approach to Catchment Characterization: Implications for River Rehabilitation in Bega Catchment, New South Wales, Australia , 2000, Environmental management.

[55]  K. Fryirs,et al.  Working with Change: The Importance of Evolutionary Perspectives in Framing the Trajectory of River Adjustment , 2008 .

[56]  C. Rosskopf,et al.  Geomorphologic map of the Biferno River valley floor system (Molise, Southern Italy) , 2013 .

[57]  Nick J. Mount,et al.  Estimation of error in bankfull width comparisons from temporally sequenced raw and corrected aerial photographs , 2003 .

[58]  P. Billi,et al.  Land use changes, torrent control works and sediment mining: effects on channel morphology and sediment flux, case study of the Reno River (Northern Italy) , 2012 .

[59]  Michele Brunetti,et al.  Droughts and extreme events in regional daily Italian precipitation series , 2002 .

[60]  N. Diodato.  Climatic fluctuations in southern Italy since the 17th century: reconstruction with precipitation records at Benevento , 2007 .

[61]  D. Hicks,et al.  The Selwyn River of New Zealand: a benchmark system for alluvial plain rivers , 2008 .

[62]  M. Piccarreta,et al.  Trend analysis of precipitation and drought in Basilicata from 1923 to 2000 within a southern Italy context , 2004 .

[63]  H. Piégay,et al.  Causes of 20th century channel narrowing in mountain and piedmont rivers of southeastern France , 2002 .

[64]  G. Kondolf.  PROFILE: Hungry Water: Effects of Dams and Gravel Mining on River Channels , 1997, Environmental management.

[65]  B. Wyżga.  20 A review on channel incision in the Polish Carpathian rivers during the 20th century , 2007 .

[66]  N. Surian,et al.  A method for the assessment and analysis of the hydromorphological condition of Italian streams: The Morphological Quality Index (MQI) , 2013 .

[67]  A. Ollero,et al.  Channel response to multiple damming in a meandering river, middle and lower Aragón River (Spain) , 2013, Hydrobiologia.

[68]  J. Knox.  Large increases in flood magnitude in response to modest changes in climate , 1993, Nature.

[69]  Global change and long-term gully sediment production dynamics in Basilicata, southern Italy , 2012, Environmental Earth Sciences.

[70]  O. Petrucci,et al.  The occurrence of floods and the role of climate variations from 1880 in Calabria (Southern Italy) , 2012 .

[71]  M. Colacino,et al.  Trends in the daily intensity of precipitation in Italy from 1951 to 1996 , 2001 .

[72]  Mario Aristide Lenzi,et al.  Channel adjustments and alteration of sediment fluxes in gravel‐bed rivers of North‐Eastern Italy: potentials and limitations for channel recovery , 2009 .

[73]  S. Dufour,et al.  From the myth of a lost paradise to targeted river restoration: forget natural references and focus on human benefits , 2009 .

[74]  H. Piégay,et al.  27 River restoration in the Alps and their surroundings: past experience and future challenges , 2007 .

[75]  Johanna Korhonen,et al.  Long-term changes in the discharge regime in Finland. , 2010 .

[76]  59. Rainfall and Drought in Southern Italy (18212001) , 2005 .

[77]  Michele Brunetti,et al.  Precipitation intensity trends in northern Italy. , 2000 .

[78]  M. Clarke,et al.  Hindcasting extreme events: the occurrence and expression of damaging floods and landslides in Southern Italy , 2006 .

[79]  L. Starkel.  Change in the frequency of extreme events as the indicator of climatic change in the Holocene (in fluvial systems) , 2002 .

[80]  S. Winterbottom,et al.  Medium and short-term channel planform changes on the Rivers Tay and Tummel, Scotland , 2000 .

[81]  P. Aucelli,et al.  Historical and recent changes of the Sele River coastal plain (Southern Italy): natural variations and human pressures , 2012, Rendiconti Lincei.

[82]  K. Fryirs,et al.  Geomorphology and River Management: Applications of the River Styles Framework , 2005 .

[83]  C. Bellecci,et al.  Brief communication "Calabria daily rainfall from 1970 to 2006" , 2010 .

[84]  N. Surian,et al.  Linee guida per l’analisi geomorfologica degli alvei fluviali e delle loro tendenze evolutive , 2009 .