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Auteur : Grafiati
Publié le 11 mars 2023

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1

Petti, Marco, Silvia Bosa et Sara Pascolo. « A Bidimensional Model of the Tagliamento River ». IOP Conference Series : Materials Science and Engineering 1203, no 2 (1 novembre 2021) : 022103. http://dx.doi.org/10.1088/1757-899x/1203/2/022103.

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Abstract The propagation of a flood wave is a very challenging topic, crucial in managing the flood risk. In the literature, several numerical models have been proposed to deal with this issue; most of them need the roughness coefficients to be assigned by the operator. The bottom roughness calibration of floodplains and channels represents a key point for flood studies, because it can heavily influence the results of any kind of numerical simulation. In this study, a numerical model is applied to the Tagliamento River, in North-East Italy. One of the main characteristics of this river is its natural environment, which changes from a very wide braided channel in the middle course to a narrow meandering river moving towards the sea. This makes the bed roughness extremely variable along the river, with different kind of vegetation, braiding, different grain size, meandering, etc. In this regard, particular care should be devoted to the roughness coefficient attribution and calibration. In the present paper, we present the detailed step of calibration and validation of a bidimensional numerical model on the Tagliamento River. A novel method to assign and calibrate roughness coefficient is introduced. Finally, the model is validated against two main flood events occurred in 1966 and 1996.
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Scaini, Anna, Ana Stritih, Constance Brouillet et Chiara Scaini. « What locals want : citizen preferences and priorities for the Tagliamento River ». Environmental Research Letters 17, no 2 (1 février 2022) : 025008. http://dx.doi.org/10.1088/1748-9326/ac4d50.

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Abstract Sustainable river management frameworks are based on the connection between citizens and nature. So far, though, the relationship between rivers and local populations has played a marginal role in river management. Here, we present a blueprint questionnaire to characterize the perception of cultural ecosystem services (CES) by locals, and how preferences change across the river landscape. We investigate how locals value the river and whether their preferences are affected by characteristics such as place of residence, age, frequency of visits and relation to the river. The questionnaire was filled in by more than 4000 respondents, demonstrating huge interest and willingness to contribute to the project. A striking 85% of respondents identify a spiritual value of the river, suggesting a strong emotional connection. River conservation is the main priority for most respondents across the different groups. The map of favorite places shows that most of the river is appreciated by locals, with a high preference for the landscape of the braided middle course. The most valued area of the river, located in the middle course, faces threats due to dam construction projects, which would modify the natural course of the river and likely impact the favorite places of the locals. Our study highlights discrepancies between management choices and citizens´ values and priorities, and shows the need for including river values and CES in river management and their potential role for tackling conflicts. More generally, this work points out that any river intervention should be pondered carefully accounting for its environmental impact also in terms of loss of river values.
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Gurnell, Angela, et Geoffrey Petts. « Trees as riparian engineers : the Tagliamento river, Italy ». Earth Surface Processes and Landforms 31, no 12 (2006) : 1558–74. http://dx.doi.org/10.1002/esp.1342.

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De Lorenzi Pezzolo, Alessandra, Michela Colombi et Gian Antonio Mazzocchin. « Spectroscopic and Chemometric Comparison of Local River Sands with the Aggregate Component in Mortars from Ancient Roman Buildings Located in the X Regio Between the Livenza and Tagliamento Rivers, Northeast Italy ». Applied Spectroscopy 72, no 10 (26 juillet 2018) : 1528–37. http://dx.doi.org/10.1177/0003702818789140.

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A combined spectroscopic–chemometric approach is used to investigate the possible sources of material exploited by the Romans to build four domus and a public thermae complex (I century BC–II century AD) located in the X Regio portion between the rivers Livenza and Tagliamento in northeast Italy. The rounded grain shapes observed in the aggregates recovered from the mortar fragments suggest that the rivers flowing close to the archaeological sites are the most likely sources of material. Coarse-grained sediment samples from nine rivers and streams in this area are examined and their similarities to the aggregate samples evaluated. The diffuse reflection Fourier transform infrared (FT-IR) spectra of the sand samples in the 63–420 µm fraction, consisting mainly of carbonates and silicates, are studied and compared in suitable spectral ranges through principal components analysis. As an additional step, the relationship between the most significant scores plots and the composition of the samples is investigated using appropriate descriptive indexes obtained from the spectra. The analysis performed on the river sand spectra alone shows that the samples from the easternmost Lemene and Tagliamento rivers present a behavior distinct from that of the western rivers (Cosa, Livenza, Meduna, Meschio, and Noncello), in agreement with their present location and past history. All the aggregate spectra investigated are compatible with the spectral characteristics of the samples from the Tagliamento and Lemene rivers, except for those from the Torre di Pordenone site, which are more similar to the sand spectra of the western rivers.
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Arscott, David B., Klement Tockner et J. V. Ward. « Thermal heterogeneity along a braided floodplain river (Tagliamento River, northeastern Italy) ». Canadian Journal of Fisheries and Aquatic Sciences 58, no 12 (1 décembre 2001) : 2359–73. http://dx.doi.org/10.1139/f01-183.

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Daily and seasonal water temperature patterns were investigated at 22 habitats in five geomorphic reaches along an Alpine-Mediterranean river. Study reaches spanned 2nd- to 7th-order river segments. Habitats included headwater streams, main and secondary channels, backwaters, and isolated pools. Multiple linear regression analyses extracted elevation and azimuth (aspect) out of eight geographical and environmental variables to explain average daily temperature patterns among habitats. Azimuth and, to a lesser degree, slope, depth, velocity, and canopy were primary determinants of diel temperature amplitude and maximum rates of diel heating and cooling. Within lowland floodplain reaches, the relative influence of groundwater and surface water varied substantially among habitats. Thermal variation among habitats was greatest in lowland floodplain reaches (nearly 15°C difference). In summer and autumn, variation between lowland floodplain aquatic habitats exceeded thermal variation observed in the main channel along the entire river corridor (120 km; 5–1100 m above sea level). Spatiotemporal variation in temperature was greatest in lower reaches owing to the interaction of water level and connectivity of isolated water bodies. Influence of groundwater and cool-water tributaries exemplified the importance of local factors (geomorphology and hydrology) superimposed on regional factors (climate and altitude) in determining large-scale thermal patterns.
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6

Tockner, Klement, James V. Ward, David B. Arscott, Peter J. Edwards, Johannes Kollmann, Angela M. Gurnell, Geoffrey E. Petts et Bruno Maiolini. « The Tagliamento River : A model ecosystem of European importance ». Aquatic Sciences - Research Across Boundaries 65, no 3 (1 septembre 2003) : 239–53. http://dx.doi.org/10.1007/s00027-003-0699-9.

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Arscott, Dave B., Klement Tockner, Dimitry van der Nat et J. V. Ward. « Aquatic Habitat Dynamics along a Braided Alpine River Ecosystem (Tagliamento River, Northeast Italy) ». Ecosystems 5, no 8 (décembre 2002) : 0802–14. http://dx.doi.org/10.1007/s10021-002-0192-7.

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Ward, J. V., K. Tockner, P. J. Edwards, J. Kollmann, G. Bretschko, A. M. Gurnell, G. E. Petts et B. Rossaro. « A reference river system for the Alps : the ‘Fiume Tagliamento’ ». Regulated Rivers : Research & ; Management 15, no 1-3 (janvier 1999) : 63–75. http://dx.doi.org/10.1002/(sici)1099-1646(199901/06)15:1/3<63 ::aid-rrr538>3.0.co;2-f.

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GUNAWARDHANA, Luminda, et So KAZAMA. « SNOW AND GLACIER CONTRIBUTION FROM ITALIAN ALPS FOR SEASONAL RIVER DISCHARGE IN TAGLIAMENTO RIVER ». Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 67, no 4 (2011) : I_67—I_72. http://dx.doi.org/10.2208/jscejhe.67.i_67.

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Picco, L., A. Tonon, D. Ravazzolo, R. Rainato et M. A. Lenzi. « Monitoring river island dynamics using aerial photographs and lidar data : the tagliamento river study case ». Applied Geomatics 7, no 3 (6 septembre 2014) : 163–70. http://dx.doi.org/10.1007/s12518-014-0139-7.

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11

Kollmann, J., M. Vieli, P. J. Edwards, K. Tockner et J. V. Ward. « Interactions between vegetation development and island formation in the Alpine river Tagliamento ». Applied Vegetation Science 2, no 1 (24 février 1999) : 25–36. http://dx.doi.org/10.2307/1478878.

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12

Tockner, K., I. Klaus, C. Baumgartner et J. V. Ward. « Amphibian Diversity and Nestedness in a Dynamic Floodplain River (Tagliamento, NE-Italy) ». Hydrobiologia 565, no 1 (juillet 2006) : 121–33. http://dx.doi.org/10.1007/s10750-005-1909-3.

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13

Arscott, D. B., K. Tockner et J. V. Ward. « Aquatic habitat diversity along the corridor of an Alpine flood plain river (Fiume Tagliamento, Italy)n ». Fundamental and Applied Limnology 149, no 4 (24 novembre 2000) : 679–704. http://dx.doi.org/10.1127/archiv-hydrobiol/149/2000/679.

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14

Ziliani, Luca, et Nicola Surian. « Reconstructing temporal changes and prediction of channel evolution in a large Alpine river : the Tagliamento river, Italy ». Aquatic Sciences 78, no 1 (19 septembre 2015) : 83–94. http://dx.doi.org/10.1007/s00027-015-0431-6.

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15

Bertoldi, Walter, Angela Gurnell, Nicola Surian, Klement Tockner, Luca Zanoni, Luca Ziliani et Guido Zolezzi. « Understanding reference processes : linkages between river flows, sediment dynamics and vegetated landforms along the Tagliamento River, Italy ». River Research and Applications 25, no 5 (juin 2009) : 501–16. http://dx.doi.org/10.1002/rra.1233.

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GUNAWARDHANA, Luminda, et So KAZAMA. « HYDROLOGICAL RESPONSE TO FUTURE CLIMATE CHANGE IN THE TAGLIAMENTO RIVER IN ITALIAN ALPS ». Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 68, no 4 (2012) : I_241—I_246. http://dx.doi.org/10.2208/jscejhe.68.i_241.

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17

Kaiser, Edith, David B. Arscott, Klement Tockner et Barbara Sulzberger. « Sources and distribution of organic carbon and nitrogen in the Tagliamento River, Italy ». Aquatic Sciences - Research Across Boundaries 66, no 1 (1 mars 2004) : 103–16. http://dx.doi.org/10.1007/s00027-003-0683-4.

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18

Gurnell, A. M., G. E. Petts, N. Harris, J. V. Ward, K. Tockner, P. J. Edwards et J. Kollmann. « Large wood retention in river channels : the case of the Fiume Tagliamento, Italy ». Earth Surface Processes and Landforms 25, no 3 (mars 2000) : 255–75. http://dx.doi.org/10.1002/(sici)1096-9837(200003)25:3<255 ::aid-esp56>3.0.co;2-h.

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19

Gunawardhana, L. N., et S. Kazama. « A water availability and low-flow analysis of the Tagliamento River discharge in Italy under changing climate conditions ». Hydrology and Earth System Sciences 16, no 3 (30 mars 2012) : 1033–45. http://dx.doi.org/10.5194/hess-16-1033-2012.

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Abstract. This study estimated the effects of projected variations in precipitation and temperature on snowfall-snowmelt processes and subsequent river discharge variations in the Tagliamento River in Italy. A lumped-parameter, non-linear, rainfall-runoff model with 10 general circulation model (GCM) scenarios was used. Spatial and temporal changes in snow cover were assessed using 15 high-quality Landsat images. The 7Q10 low-flow probability distribution approximated by the Log-Pearson type III distribution function was used to examine river discharge variations with respect to climate extremes in the future. On average, the results obtained for 10 scenarios indicate a consistent warming rate for all time periods, which may increase the maximum and minimum temperatures by 2.3 °C (0.6–3.7 °C) and 2.7 °C (1.0–4.0 °C), respectively, by the end of the 21st century compared to the present climate. Consequently, the exponential rate of frost day decrease for 1 °C winter warming in lower-elevation areas is approximately three-fold (262%) higher than that in higher-elevation areas, revealing that snowfall in lower-elevation areas will be more vulnerable under a changing climate. In spite of the relatively minor changes in annual precipitation (−17.4 ~ 1.7% compared to the average of the baseline (1991–2010) period), snowfall will likely decrease by 48–67% during the 2080–2099 time period. The mean river discharges are projected to decrease in all seasons, except winter. The low-flow analysis indicated that while the magnitude of the minimum river discharge will increase (e.g. a 25% increase in the 7Q10 estimations for the winter season in the 2080–2099 time period), the number of annual average low-flow events will also increase (e.g. 16 and 15 more days during the spring and summer seasons, respectively, in the 2080–2099 time period compared to the average during the baseline period), leading to a future with a highly variable river discharge. Moreover, a consistent shift in river discharge timing would eventually cause snowmelt-generated river discharge to occur approximately 12 days earlier during the 2080–2099 time period compared to the baseline climate. These results are expected to raise the concern of policy makers, leading to the development of new water management strategies in the Tagliamento River basin to cope with changing climate conditions.
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Gunawardhana, L. N., et S. Kazama. « A water availability and low-flow analysis of the Tagliamento River discharge in Italy under changing climate conditions ». Hydrology and Earth System Sciences Discussions 9, no 1 (5 janvier 2012) : 139–73. http://dx.doi.org/10.5194/hessd-9-139-2012.

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Abstract. This study estimated the effects of projected variations in precipitation and temperature on snowfall-snowmelt processes and subsequent river discharge variations in the Tagliamento River in Italy. A lumped-parameter, non-linear, rainfall-runoff model with 10 general circulation model (GCM) scenarios was used to capture river response variations attributed to climate-driven changes in 3 future time periods in comparison to the present climate. Spatial and temporal changes in snow cover were assessed using 15 high-quality Landsat images collected during the 2001–2003 time period, which were further used to define different elevation bands to incorporate the elevation effects on snowfall-snowmelt processes. The 7Q10 low-flow probability distribution approximated by the Log-Pearson type III distribution function was used to examine river discharge variations with respect to climate extremes in the future. On average, the results obtained for 10 scenarios indicate a consistent warming rate for all time periods, which may increase the maximum and minimum temperatures by 2.3 °C (0.6–3.7 °C) and 2.7 °C (1.0–4.0 °C), respectively, by the end of the 21st century compared to the present climate. Consequently, the exponential rate of frost day decrease for 1 °C winter warming in lower-elevation areas is approximately three-fold (262%) higher than that in higher-elevation areas, revealing that snowfall in lower-elevation areas will be more vulnerable under a changing climate. In spite of the relatively minor changes in annual precipitation (−17.4 ~ 1.7% compared to the average of the baseline (1991–2010) period), snowfall will likely decrease by 48–67% during the 2080–2099 time period. The accumulated effects of a decrease in winter precipitation and an increase in evapotranspiration demand on winter river discharge will likely be compensated for by early snowmelt runoff due to increases in winter temperatures. Nevertheless, the river discharge in other seasons will decrease significantly, with a 59% decrease in the predicted river discharge in October over 100 yr. The low-flow analysis indicated that while the magnitude of the minimum river discharge will increase (e.g. a 25% increase in the 7Q10 estimations for the winter season in the 2080–2099 time period), the number of annual average low-flow events will also increase (e.g. 16 and 15 more days during the spring and summer seasons, respectively, in the 2080–2099 time period compared to the average during the baseline period), leading to a future with a highly variable river discharge. Moreover, a consistent shift in river discharge timing would eventually cause snowmelt-generated river discharge to occur approximately 12 days earlier during the 2080–2099 time period compared to the baseline climate. These results are expected to raise the concern of policy makers, leading to the development of new water management strategies in the Tagliamento River basin to cope with changing climate conditions.
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Arscott, David B., Rolf Glatthaar, Klement Tockner et J. V. Ward. « Larval black fly (Diptera : Simuliidae) distribution and diversity along a floodplain river in the Alps (Tagliamento River, Italy) ». SIL Proceedings, 1922-2010 28, no 2 (juillet 2002) : 524–31. http://dx.doi.org/10.1080/03680770.2001.11901772.

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Schmidt, Benedikt, Lukas Indermaur et Klement Tockner. « Effect of transmitter mass and tracking duration on body mass change of two anuran species ». Amphibia-Reptilia 29, no 2 (2008) : 263–69. http://dx.doi.org/10.1163/156853808784125054.

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Abstract During tracking studies, the behaviour of animals may be affected by the tracking and tagging methods used, which may influence the results obtained. Our aim was to assess the impact of transmitter mass and the duration of tracking period on the body mass change (BMC) of two anuran species that were fitted with externally attached radio transmitters. Bufo b. spinosus and B. viridis were radio-tracked for three months during summer in the active tract of a large gravel-bed river (Tagliamento River, NE Italy). Our results demonstrated that transmitter mass and the duration of the tracking period did not affect BMC of the two anurans in their terrestrial summer habitats because methodological factors poorly predicted variation in BMC. Therefore, we encourage the use of tracking methods in amphibian ecology.
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23

Giani, Michele, Nives Ogrinc, Samo Tamše et Stefano Cozzi. « Elevated River Inputs of the Total Alkalinity and Dissolved Inorganic Carbon in the Northern Adriatic Sea ». Water 15, no 5 (25 février 2023) : 894. http://dx.doi.org/10.3390/w15050894.

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The response of coastal systems to global acidification depends strongly on river inputs, which can alter the total alkalinity (AT) and dissolved inorganic carbon (DIC) in seawater. The northern Adriatic Sea (NAd) is a shallow continental shelf region that currently receives about 15% of the total freshwater input in the Mediterranean Sea, where the role of riverine discharges on the carbonate system has been poorly studied. In particular, river discharges can alter the carbonate system in the sea, affecting both the equilibrium chemistry and biological processes. For the main rivers flowing into the NAd (the Po, Adige, Brenta, Piave, Livenza, Tagliamento, Isonzo, Timavo and Rižana), data were collected for the pH, concentrations of the total alkalinity (AT), Ca2+ and Mg2+ and the isotopic ratio of stable carbon in the dissolved inorganic carbon (δ13CDIC). The DIC fluxes were estimated using the THINCARB (THermodynamic modeling of INOrganic CARBon) model for the compilation of the AT and pH data. The results show that the total transport of the AT in the rivers was 205 Gmol yr−1 while the transport of the DIC was 213 Gmol yr−1, of which about 70% was from the Po River. About 97% of the DIC in the river waters was in the form of bicarbonates. The high Mg2+/Ca2+ ratios indicate that dolomite weathering is predominant in the Adige, Piave, and Livenza river basins, while lower ratios in the Timavo and Rižana rivers indicate a greater proportion of calcite. The mean δ13C-DIC value was estimated to be −10.0 ± 1.7 ‰, a value nowadays considered typical for the DIC flux inputs in oceanic carbon cycle modeling. The DIC flux depends on the mineral weathering and biological activity in each river basin. However, these natural processes can be modified by anthropogenic disturbances that should be better quantified.
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Francis, Robert A., et Angela M. Gurnell. « Initial establishment of vegetative fragments within the active zone of a braided gravel-bed river (River Tagliamento, NE Italy) ». Wetlands 26, no 3 (septembre 2006) : 641–48. http://dx.doi.org/10.1672/0277-5212(2006)26[641:ieovfw]2.0.co;2.

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Huber, Emanuel, et Peter Huggenberger. « Subsurface flow mixing in coarse, braided river deposits ». Hydrology and Earth System Sciences 20, no 5 (23 mai 2016) : 2035–46. http://dx.doi.org/10.5194/hess-20-2035-2016.

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Abstract. Coarse, braided river deposits show a large hydraulic heterogeneity on the metre scale. One of the main depositional elements found in such deposits is a trough structure filled with layers of bimodal gravel and open-framework gravel, the latter being highly permeable. However, the impact of such trough fills on subsurface flow and advective mixing has not drawn much attention. A geologically realistic model of trough fills is proposed and fitted to a limited number of ground-penetrating radar records surveyed on the river bed of the Tagliamento River (northeast Italy). A steady-state, saturated subsurface flow simulation is performed on the small-scale, high-resolution, synthetic model (size: 75 m × 80 m × 9 m). Advective mixing (i.e. streamline intertwining) is visualised and quantified based on particle tracking. The results indicate strong advective mixing as well as a large flow deviation induced by the asymmetry of the trough fills with regard to the main flow direction. The flow deviation induces a partial, large-scale rotational effect. These findings depict possible advective mixing found in natural environments and can guide the interpretation of ecological processes such as in the hyporheic zone.
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DOERING, MICHAEL, URS UEHLINGER, THEKLA ACKERMANN, MICHAEL WOODTLI et KLEMENT TOCKNER. « Spatiotemporal heterogeneity of soil and sediment respiration in a river-floodplain mosaic (Tagliamento, NE Italy) ». Freshwater Biology 56, no 7 (1 février 2011) : 1297–311. http://dx.doi.org/10.1111/j.1365-2427.2011.02569.x.

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Spaliviero, Mathias. « Historic fluvial development of the Alpine-foreland Tagliamento River, Italy, and consequences for floodplain management ». Geomorphology 52, no 3-4 (juin 2003) : 317–33. http://dx.doi.org/10.1016/s0169-555x(02)00264-7.

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Ravazzolo, D., L. Mao, L. Picco et M. A. Lenzi. « Tracking log displacement during floods in the Tagliamento River using RFID and GPS tracker devices ». Geomorphology 228 (janvier 2015) : 226–33. http://dx.doi.org/10.1016/j.geomorph.2014.09.012.

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Huber, Emanuel, et Peter Huggenberger. « Morphological perspective on the sedimentary characteristics of a coarse, braided reach : Tagliamento River (NE Italy) ». Geomorphology 248 (novembre 2015) : 111–24. http://dx.doi.org/10.1016/j.geomorph.2015.07.015.

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Doering, M., U. Uehlinger, A. Rotach, D. R. Schlaepfer et K. Tockner. « Ecosystem expansion and contraction dynamics along a large Alpine alluvial corridor (Tagliamento River, Northeast Italy) ». Earth Surface Processes and Landforms 32, no 11 (2007) : 1693–704. http://dx.doi.org/10.1002/esp.1594.

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Zen, Simone, Angela M. Gurnell, Guido Zolezzi et Nicola Surian. « Exploring the role of trees in the evolution of meander bends : The Tagliamento River, Italy ». Water Resources Research 53, no 7 (juillet 2017) : 5943–62. http://dx.doi.org/10.1002/2017wr020561.

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Sitzia, Tommaso, Simone Iacopino, Edoardo Alterio, Francesco Comiti, Nicola Surian, Luca Mao, Mario Aristide Lenzi, Thomas Campagnaro et Lorenzo Picco. « Revisiting Vegetation Gradient Analysis and the Intermediate Disturbance Hypothesis for the Interpretation of Riverine Geomorphic Patterns ». Land 12, no 2 (31 janvier 2023) : 378. http://dx.doi.org/10.3390/land12020378.

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Human effects on the water economy of the river systems are currently well documented at the worldwide scale, impacting a range of ecosystem services. In this perspective article, we discuss the findings of recent papers that under different intensities of human disturbance have coupled the analyses of riverine geomorphological and plant community patterns. The discussion is carried out within the historical framework of past and current methods of sampling and analysing the river geomorphology and the plant communities along cross-sectional profiles. The research has been conducted along three major gravel-bed rivers of the south-eastern Italian Alps: Brenta, Piave, and Tagliamento. The collated and summarised results here demonstrate the existence of a strong relationship between the woody species variance that can be explained by geomorphologic patterns and human disturbance intensity. The less disturbed river has an intermediate value of species variance that can be explained by geomorphology, the intermediate-disturbed river has the highest value, and the highly disturbed river has the lowest value. Then, we proposed an interpretation key and an adaptation of the intermediate disturbance hypothesis, which reads as: “in rivers, the greatest influence of geomorphic properties on vegetation occurs in the moderate or middle ranges of a human disturbance gradient”. We argue that the “influence of the geomorphic properties on vegetation” is assessed through the species constrained variance through an ordination analysis, such as that which is explained here. The most recent collection techniques based on field survey and remote sensing are making it increasingly easy and accurate to study of the trends of geomorphic and plant community variables throughout time and space. Thus, we encourage that researchers should check whether and how our observation is conserved through different groups of taxa and intensities of natural and human disturbance.
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Bertoldi, W., L. Zanoni et M. Tubino. « Assessment of morphological changes induced by flow and flood pulses in a gravel bed braided river : The Tagliamento River (Italy) ». Geomorphology 114, no 3 (janvier 2010) : 348–60. http://dx.doi.org/10.1016/j.geomorph.2009.07.017.

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Huber, E., et P. Huggenberger. « Subsurface flow mixing in coarse, braided river deposits ». Hydrology and Earth System Sciences Discussions 12, no 9 (10 septembre 2015) : 9295–316. http://dx.doi.org/10.5194/hessd-12-9295-2015.

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Abstract. Coarse, braided river deposits show a large hydraulic heterogeneity at the metre scale. One of the main depositional elements found in such deposits is a trough structure filled with open-framework–bimodal gravel couplet cross-beds. Several studies investigated the impact of the highly permeable open-framework gravel texture mainly in terms of concentration breakthrough curves. However, although the trough fills are expected to be significant mixing agents for the subsurface flow, their impact on the three-dimensional flow field has not draw much attention. This study aims to evaluate the subsurface flow mixing caused by overlapping trough fills embedded in a poorly-sorted gravel matrix. Below the river bed of the Tagliamento River (northeast Italy), trough fills were identified with ground-penetrating radar (GPR) probing. Based on field observations of coarse, braided river deposits, a simple three-dimensional geometrical model with associated hydraulic properties was fitted to the interpreted GPR reflectors. Then, steady-state subsurface flow and advective transport simulations were performed on the small-scale, high-resolution model (size: 45 m × 50 m × 10.26 m). The impact of trough fills on the flow field is visualised by the injection of a conservative tracer at three different depths.
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Manfrin, Chiara, Massimo Zanetti, David Stanković, Umberto Fattori, Victoria Bertucci-Maresca, Piero G. Giulianini et Alberto Pallavicini. « Detection of the Endangered Stone Crayfish Austropotamobius torrentium (Schrank, 1803) and Its Congeneric A. pallipes in Its Last Italian Biotope by eDNA Analysis ». Diversity 14, no 3 (10 mars 2022) : 205. http://dx.doi.org/10.3390/d14030205.

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The stone crayfish, Austropotamobius torrentium, is a European freshwater crayfish. Although this species is relatively widespread throughout the continent, it is undergoing significant declines throughout its range. However, as the decline rates have not been quantified in detail, this species is classified as data deficient by the IUCN Red List of Threatened Species. The present study describes the development and validation of two species-specific assays based on hydrolysis probe chemistry for the detection of A. torrentium and A. pallipes environmental DNA (eDNA) in water samples collected in the Julian Alps of Italy (Friuli Venezia Giulia). The eDNA-based method was applied to 14 sites within the Danubian Slizza basin, known to be inhabited by A. torrentium, but with insufficient information on their distribution. In addition, one station in the Tagliamento River basin was sampled to test the performance of the A. pallipes probe. The presence of A. torrentium is confirmed at 6 out of 15 sites. At four of these sites, A. torrentium is detected for the first time. In contrast, the presence of A. torrentium was not detected at two sites already known to harbour the species. Finally, the presence of A. pallipes was confirmed in the station belonging to the Tagliamento basin. The methodology described, which allows the distinction between the two species, paves the way for the parallel detection of the stone crayfish and the white-clawed crayfish (A. pallipes) through eDNA analysis.
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Bosa, Silvia, Marco Petti et Sara Pascolo. « Numerical Modelling of Cohesive Bank Migration ». Water 10, no 7 (21 juillet 2018) : 961. http://dx.doi.org/10.3390/w10070961.

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River morphological evolution is a challenging topic, involving hydrodynamic flow, sediment transport and bank stability. Lowland rivers are often characterized by the coexistence of granular and cohesive material, with significantly different behaviours. This paper presents a bidimensional morphological model to describe the evolution of the lower course of rivers, where there are both granular and cohesive sediments. The hydrodynamic equations are coupled with two advection–diffusion equations, which consider the transport of granular and cohesive suspended sediment concentration separately. The change of bed height is evaluated as the sum of the contributions of granular and sediment material. A bank failure criterion is developed and incorporated into the numerical simulation of the hydrodynamic flood wave and channel evolution, to describe both bed deformation and bank recession. To this aim, two particular mechanisms are considered: the former being a lateral erosion due to the current flow and consequent cantilever collapse and the latter a geostatic failure due to the submergence. The equation system is integrated by means of a finite volume scheme. The resulting model is applied to the Tagliamento River, in northern Italy, where the meander migration is documented through a sequence of aerial images. The channel evolution is simulated, imposing an equivalent hydrograph consisting of a sequence of flood waves, which represents a medium year, with reference to their effect on sediment transport. The results show that the model adequately describes the general morphological evolution of the meander.
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Rapti-Caputo, Dimitra, Antonio Bratus et Giovanni Santarato. « Strategic groundwater resources in the Tagliamento River basin (northern Italy) : hydrogeological investigation integrated with geophysical exploration ». Hydrogeology Journal 17, no 6 (17 avril 2009) : 1393–409. http://dx.doi.org/10.1007/s10040-009-0459-6.

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Doering, M., U. Uehlinger et K. Tockner. « Vertical hydrological exchange, and ecosystem properties and processes at two spatial scales along a floodplain river (Tagliamento, Italy) ». Freshwater Science 32, no 1 (mars 2013) : 12–25. http://dx.doi.org/10.1899/12-013.1.

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Mardhiah, Ulfah, Matthias C. Rillig et Angela Gurnell. « Reconstructing the development of sampled sites on fluvial island surfaces of the Tagliamento River, Italy, from historical sources ». Earth Surface Processes and Landforms 40, no 5 (24 octobre 2014) : 629–41. http://dx.doi.org/10.1002/esp.3658.

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Holloway, James V., Matthias C. Rillig et Angela M. Gurnell. « Physical environmental controls on riparian root profiles associated with black poplar (Populus nigra L.) along the Tagliamento River, Italy ». Earth Surface Processes and Landforms 42, no 8 (12 janvier 2017) : 1262–73. http://dx.doi.org/10.1002/esp.4076.

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Moretto, Johnny, Fabio Delai, Lorenzo Picco et Mario Aristide Lenzi. « Integration of colour bathymetry, LiDAR and dGPS surveys for assessing fluvial changes after flood events in the Tagliamento River (Italy) ». Agricultural Sciences 04, no 08 (2013) : 21–29. http://dx.doi.org/10.4236/as.2013.48a004.

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Welber, Matilde, Walter Bertoldi et Marco Tubino. « The response of braided planform configuration to flow variations, bed reworking and vegetation : the case of the Tagliamento River, Italy ». Earth Surface Processes and Landforms 37, no 5 (26 janvier 2012) : 572–82. http://dx.doi.org/10.1002/esp.3196.

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Biagi, Paolo, Elisabetta Starnini et Carlo Beltrame. « THE MERCURIO GUNFLINTS : A TECHNO-TYPOLOGICAL AND CULTURAL ASSESSMENT ». Antiquaries Journal 96 (13 juillet 2016) : 363–89. http://dx.doi.org/10.1017/s0003581516000214.

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The discovery of the wreck of the brig Mercurio, which sank in 1812 in the waters of the north Adriatic, is of major significance for the study of Italic Kingdom vessels from the Napoleonic era. The underwater excavations carried out in 2004–11 led to the recovery of many small finds, among which are several gunflints of different size and shape. The Mercurio gunflints were produced mainly from blades using a technique in use in Britain and France, but also in the workshops of the Lessini Hills around Ceredo (Verona province, northern Italy). We suggest that the flint employed for their manufacture probably came from Monte Baldo, in the Trentino, or perhaps from the River Tagliamento, in Friuli. We can exclude the possibility that the specimens recovered from the shipwreck were made from French flint because of the typically north Italian manufacturing technique and the character of the grey Treveti-derived flint. Given the complexity of the period during which the Grado (or Pirano) battle took place, the study of even such small items can contribute to a better interpretation of the dramatic events that characterised the beginning of the nineteenth century in that part of the Mediterranean.
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Borga, Marco, Paolo Boscolo, Francesco Zanon et Marco Sangati. « Hydrometeorological Analysis of the 29 August 2003 Flash Flood in the Eastern Italian Alps ». Journal of Hydrometeorology 8, no 5 (1 octobre 2007) : 1049–67. http://dx.doi.org/10.1175/jhm593.1.

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Abstract The 29 August 2003 storm on the upper Tagliamento River basin in the eastern Italian Alps is examined as a prototype for organized convective systems that dominate the upper tail of the precipitation frequency distribution and are likely responsible for the majority of flash flood peaks in this area. The availability of high-resolution rainfall estimates from radar observations and rain gauge networks, together with flood response observations derived from stream gauge data and post-event surveys, provides the opportunity to study the hydrometeorological and hydrological mechanisms associated with this extreme storm and the associated flood. The flood occurred at the end of a climatic anomaly of prolonged drought and warm conditions over Europe and the Mediterranean region. A characteristic of the event is its organization in well-defined banded structures, some of which persisted in the same locations for the duration of the event. The steadiness of these rainbands led to highly variable precipitation accumulations and, associated with orographic enhancement, played a central role in the space–time organization of the storm. Two dominant controls on extreme flood response are recognized and analyzed: steadiness of convective bands and dry antecedent soil moisture conditions.
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Mardhiah, Ulfah, Tancredi Caruso, Angela Gurnell et Matthias C. Rillig. « Just a matter of time : Fungi and roots significantly and rapidly aggregate soil over four decades along the Tagliamento River, NE Italy ». Soil Biology and Biochemistry 75 (août 2014) : 133–42. http://dx.doi.org/10.1016/j.soilbio.2014.04.012.

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Ronchi, Livio, Alessandro Fontana, Kim M. Cohen et Esther Stouthamer. « Late Quaternary landscape evolution of the buried incised valley of Concordia Sagittaria (Tagliamento River, NE Italy) : A reconstruction of incision and transgression ». Geomorphology 373 (janvier 2021) : 107509. http://dx.doi.org/10.1016/j.geomorph.2020.107509.

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Langhans, Simone D., et Klement Tockner. « The role of timing, duration, and frequency of inundation in controlling leaf litter decomposition in a river-floodplain ecosystem (Tagliamento, northeastern Italy) ». Oecologia 147, no 3 (20 octobre 2005) : 501–9. http://dx.doi.org/10.1007/s00442-005-0282-2.

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Zabuski, Lesław, Giulia Bossi et Gianluca Marcato. « Influence of the Geometry Alteration of the Landslide Slope on its Stability : A Case Study in the Carnian Alps (Italy) ». Archives of Hydro-Engineering and Environmental Mechanics 64, no 2 (1 décembre 2017) : 101–14. http://dx.doi.org/10.1515/heem-2017-0007.

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Abstract The paper presents the principles of the slope reprofiling and proves the effectiveness of this stabilization measure. The case study of two adjacent landslides in the National Road 52 “Carnica” in the Tagliamento River valley, the Carnian Alps (46°23′49″N, 12°42′51″E) are the example allowing for illustration of this approach. The phenomena have been studied for more than a decade, making it possible to carry out a detailed geological and geomorphological reconstruction. That was done on the basis of a large amount of monitoring data collected during that period. Since the landslides are threatening an important road, countermeasure works to ameliorate the stability conditions of the slides need to be designed. The paper focuses on the creation of a numerical model consistent with monitoring data and capable of reconstructing the dynamics of both landslides. Two cross-sections, one for each landslide, were selected for the analysis. The geometry of the slip surface was determined on the basis of control points, such as slip surface readings from inclinometers, and geomorphological evidence for the contour. The FLAC2D code was used to evaluate the current stability of these landslides and to determine the effectiveness of changing the slope geometry by removing material from the upper part of the slope and putting it to the lowest part as reinforcement.
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Shumilova, Oleksandra O., Alexander N. Sukhodolov, George S. Constantinescu et Bruce J. MacVicar. « Dynamics of shallow wakes on gravel-bed floodplains : dataset from field experiments ». Earth System Science Data 13, no 4 (12 avril 2021) : 1519–29. http://dx.doi.org/10.5194/essd-13-1519-2021.

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Abstract. Natural dynamics of river floodplains are driven by the interaction of flow and patchy riparian vegetation, which has implications for channel morphology and diversity of riparian habitats. Fundamental mechanisms affecting the dynamics of flow in such systems are still not fully understood due to a lack of experimental data collected in natural environments that are free of the unavoidable scaling effects in laboratory studies. Here we present a detailed dataset on the hydrodynamics of shallow wake flows that develop behind solid and porous obstructions. The dataset was collected during a field experimental campaign carried out in a side branch of the gravel-bed Tagliamento River in northeast Italy. The dataset consists of 30 experimental runs in which we varied the diameter of the surface-mounted obstruction, its solid volume fraction, its porosity at the leading edge, the object's submergence and the approach velocity. Each run included: (1) measurements of mean velocity and turbulence in the longitudinal transect through the centreline of the flow with up to 25–30 sampling locations and from 8 to 10 lateral profiles measured at 14 locations, (2) detailed surveys of the free surface topography and (3) flow visualizations and video recordings of the wake patterns using a drone. The field scale of the experimental setup, precise control of the approach velocity, configuration of models and natural gravel-bed context for this experiment makes this dataset unique. Besides enabling the examination of scaling effects, these data also allow the verification of numerical models and provide insight into the effects of driftwood accumulations on the dynamics of wakes. Data are available with open access via the Zenodo portal (Shumilova et al., 2020) with DOI https://doi.org/10.5281/zenodo.3968748.
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Bolla, Alberto, et Paolo Paronuzzi. « Seismic Analysis of a Limestone Rock Slope Through Numerical Modelling : Pseudo-Static vs. Non-Linear Dynamic Approach ». IOP Conference Series : Earth and Environmental Science 906, no 1 (1 novembre 2021) : 012093. http://dx.doi.org/10.1088/1755-1315/906/1/012093.

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Abstract In the present work, a seismic analysis was performed in advance on a limestone rock slope (height = 150 m) outcropping along the Tagliamento River valley, in the Friuli Venezia Giulia Region, north-eastern Italy. The analysed slope is characterised by strong rock mass damage, thus resulting in a critical stability condition (unstable volume = 110,000–200,000 m3). The seismic analysis was performed adopting the 2D finite difference method (FDM) and employing both a pseudo-static approach and a non-linear dynamic approach. Model outcomes demonstrate that the seismic motion induces internal, localised ruptures within the rock mass. Some important differences in the mechanical behaviour of the rock slope were highlighted, depending on the specific modelling approach assumed. When adopting a pseudo-static approach, the slope failure occurs for PGA values ranging between 0.056 g and 0.124 g, depending on the different initial static stability condition assumed for the slope (Strength Reduction Factor SRF = 1.00–1.15). According to the non-linear dynamic approach, the slope failure is achieved for PGA values varying between 0.056 g and 0.213 g. Pre-collapse slope displacements calculated with the pseudo-static approach (12–15 cm) are much more greater than those obtained through the non-linear dynamic approach (0.5–3 mm). The modelling results obtained through the non-linear dynamic analysis also testify that the seismic topographic amplification is 1.5 times the target acceleration at the slope face and 2.5 times the target acceleration at the slope toe.
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