Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina)
Around 11.5*106m3 of rock detached from the eastern slope of the Santa Cruz valley (San Juan province, Argentina) in the first fortnight of January 2005. The rockslide-debris avalanche blocked the course, resulting in the development of a lake with maximum length of around 3.5km. The increase in the...
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todo:paper_0169555X_v186_n_p28_Penna2023-10-03T15:07:13Z Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina) Penna, I.M. Derron, M.-H. Volpi, M. Jaboyedoff, M. Andes Argentina DAN3D Landslide Landslide dam failure back analysis dam construction dam failure debris avalanche hydroelectric power plant landslide morphometry slope failure Andes Argentina San Juan [Argentina] Around 11.5*106m3 of rock detached from the eastern slope of the Santa Cruz valley (San Juan province, Argentina) in the first fortnight of January 2005. The rockslide-debris avalanche blocked the course, resulting in the development of a lake with maximum length of around 3.5km. The increase in the inflow rate from 47,000-74,000m3/d between April and October to 304,000m3/d between late October and the first fortnight of November, accelerated the growing rate of the lake. On 12 November 2005 the dam failed, releasing 24.6*106m3 of water. The resulting outburst flood caused damages mainly on infrastructure, and affected the facilities of a hydropower dam which was under construction 250km downstream from the source area. In this work we describe causes and consequences of the natural dam formation and failure, and we dynamically model the 2005 rockslide-debris avalanche with DAN3D. Additionally, as a volume ~24*106m3of rocks still remain unstable in the slope, we use the results of the back analysis to forecast the formation of a future natural dam. We analyzed two potential scenarios: a partial slope failure of 6.5*106m3 and a worst case where all the unstable volume remaining in the slope fails. The spreading of those potential events shows that a new blockage of the Santa Cruz River is likely to occur. According to their modeled morphometry and the contributing watershed upstream the blockage area, as the one of 2005, the dams would also be unstable. This study shows the importance of back and forward analysis that can be carried out to obtain critical information for land use planning, hazards mitigation, and emergency management. © 2012 Elsevier B.V. Fil:Penna, I.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0169555X_v186_n_p28_Penna |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Andes Argentina DAN3D Landslide Landslide dam failure back analysis dam construction dam failure debris avalanche hydroelectric power plant landslide morphometry slope failure Andes Argentina San Juan [Argentina] |
| spellingShingle |
Andes Argentina DAN3D Landslide Landslide dam failure back analysis dam construction dam failure debris avalanche hydroelectric power plant landslide morphometry slope failure Andes Argentina San Juan [Argentina] Penna, I.M. Derron, M.-H. Volpi, M. Jaboyedoff, M. Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina) |
| topic_facet |
Andes Argentina DAN3D Landslide Landslide dam failure back analysis dam construction dam failure debris avalanche hydroelectric power plant landslide morphometry slope failure Andes Argentina San Juan [Argentina] |
| description |
Around 11.5*106m3 of rock detached from the eastern slope of the Santa Cruz valley (San Juan province, Argentina) in the first fortnight of January 2005. The rockslide-debris avalanche blocked the course, resulting in the development of a lake with maximum length of around 3.5km. The increase in the inflow rate from 47,000-74,000m3/d between April and October to 304,000m3/d between late October and the first fortnight of November, accelerated the growing rate of the lake. On 12 November 2005 the dam failed, releasing 24.6*106m3 of water. The resulting outburst flood caused damages mainly on infrastructure, and affected the facilities of a hydropower dam which was under construction 250km downstream from the source area. In this work we describe causes and consequences of the natural dam formation and failure, and we dynamically model the 2005 rockslide-debris avalanche with DAN3D. Additionally, as a volume ~24*106m3of rocks still remain unstable in the slope, we use the results of the back analysis to forecast the formation of a future natural dam. We analyzed two potential scenarios: a partial slope failure of 6.5*106m3 and a worst case where all the unstable volume remaining in the slope fails. The spreading of those potential events shows that a new blockage of the Santa Cruz River is likely to occur. According to their modeled morphometry and the contributing watershed upstream the blockage area, as the one of 2005, the dams would also be unstable. This study shows the importance of back and forward analysis that can be carried out to obtain critical information for land use planning, hazards mitigation, and emergency management. © 2012 Elsevier B.V. |
| format |
JOUR |
| author |
Penna, I.M. Derron, M.-H. Volpi, M. Jaboyedoff, M. |
| author_facet |
Penna, I.M. Derron, M.-H. Volpi, M. Jaboyedoff, M. |
| author_sort |
Penna, I.M. |
| title |
Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina) |
| title_short |
Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina) |
| title_full |
Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina) |
| title_fullStr |
Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina) |
| title_full_unstemmed |
Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina) |
| title_sort |
analysis of past and future dam formation and failure in the santa cruz river (san juan province, argentina) |
| url |
http://hdl.handle.net/20.500.12110/paper_0169555X_v186_n_p28_Penna |
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AT pennaim analysisofpastandfuturedamformationandfailureinthesantacruzriversanjuanprovinceargentina AT derronmh analysisofpastandfuturedamformationandfailureinthesantacruzriversanjuanprovinceargentina AT volpim analysisofpastandfuturedamformationandfailureinthesantacruzriversanjuanprovinceargentina AT jaboyedoffm analysisofpastandfuturedamformationandfailureinthesantacruzriversanjuanprovinceargentina |
| _version_ |
1807315454992056320 |