la conchita landslide 2005 case study

In 1995, A Large Landslide Occurred, Damaging About A Dozen Homes. This paper describes the regional geology, dimensions, morphology, sedimentology, and age relations of the Holocene "Carlson landslide," a large moist landslide composed of basalt breccia located on the eastern margin of the Lost River Range, Idaho. September 15, 2016, was investigated. The main lobe, comprising 90% of the deposit, rapidly transformed into a large scale debris flow, eroded and entrained over 4,000 m 3 of material along its path, overran a temporary wall, then flowed into the residential community. Review of proposed mechanisms for sturzstroms (long-runout landslides), Using hydroscience and hydrotechnical engineering to reduce debris flow hazards, Mudflow of 1941 at Wrightwood, Southern California, Superelevation of flowing avalanches around curved channel bends. Based on the timing of the slides relative to the rainfall pattern, for which event - 1995 or 2005 - do you think the water had infiltrated deeper into the subsurface? database. It is, therefore, desirable to estimate the peak flow-discharge for similar extreme rainfall events in future. The immediate cause of flowage was rapid melting of deep winter snow. In 1991, area approach was used to control debris flow in Laogan Ravine. These processes usually cause the movement of very large rock masses. GEOS 3310 Lecture Notes, Spring 2006 The hazard map was then divided by two scales, one with three classes for disaster managers and one with 10 detailed hazard classes for technical staff. The unstable areas frequently create debris flows and debris slicing affecting the human settlements. The study is based on a terrain mapping units (TMU) map, generated at 1:50,000 scale by interpretation of aerial photos, satellite images and field data. Physical characteristics for a slide: 29. Flowing avalanches are those with a dense core of flowing granular material at the base, which dominates the dynamics causing friction. You can request the full-text of this article directly from the authors on ResearchGate. Models will be needed that are based on understanding of the physical processes of debris flows, and are able to be tested and calibrated for specific applications by comparison with comprehensive and reliable field data. These data are combined to deduce the factors that prompted the slope failure, the kinematics of initiation, travel, and stopping of the landslide, as well as its postemplacement degradation. © 2008-2021 ResearchGate GmbH. The mechanism of the rapid deep-seated landslides is examined through a series, Geomorphological information can be combined with decision-support tools to assess landslide hazard and risk. Explain: 31. Intense shattering and rapid weathering of the bedrock (Pelona schist) within the San Andreas rift zone at this location contributed materially to preparing debris for flowage. Huftile et alii (1997) observed 34 m of vertical separation of the Punta Gorda wave-cut platform along the fault, corresponding to a dip-slip rate of about 1.5 Fig 2 - Geologic map of the 2005 La Conchita landslide and vicinity. The most tragic event was a landslide (mudslide) at La Conchita, a coastal community about 112 km west of Los Angeles. The model domain consisted of 25,614 square grid cells, each measuring 1.52 m on a side, and was developed The community lies on a narrow strip of land about 250 meters (820 feet) wide between the shoreline and abutting a … Journal of Chinese Soil and Water Conservation. At the same time this essay will contribute to the study of geological disaster such as earthquake ,landslide and debris flow. Some days after an intense rainfall period, large landslides involving the bedrock can still take place. All rights reserved. landslides. Unstable areas are mainly along first-order tributary streams and meander bends developed on lahars, pyroclastic flows, and pumice fall deposits whose stability has decreased in the basin. Among those hazards, reservoir induced seismicity is a public concern question, which is a special type of seismicity, with the characteristic of shallow source, high intensity, fast attenuation and, Typhoon Morakot struck central and southern Taiwan on August 8, 2009. In this study, we examined three large historical landslide dams and outburst disasters in the north Fossa Magna area. area, having different type of diverse topography and complex geological conditions, where geological calamities occur frequently Debris basins are structurally simple but need reliable predictions of debris-flow volume. Debris flow hazards are the outcome of natural processes of erosion and sediment motion interacting with human systems. The estimated peak flow-discharges of historical events were then compared with the observation data acquired from stream gauge stations and previous studies. Mitigation Measures Were Taken To Reduce/prevent Future. The minor lobe, comprising about 10% of the total landslide volume, was deposited in pulses that arrived from different directions at different times. Therefore ,it is necessary to summarize the geodetic datum and tech of, The geological hazards pose a serious challenge to the ecological system in the region of the Three Gorges Reservoir area, which include landslides, rockfalls, debris flow, earthquake, and so on. The volcano is prone to landslides due to its loose vulcanoclastic sediments that are dragged by the streams and torrents during the rainy season. all of them have caused casualties and brought great losses. The resulting increasing landslide density with higher hazard classes indicates that the output map is reliable. 12/10/2004 Ojai Daily Rainfall 12/30/1994 1 12/20/2004 1/9/1995 10 Jan 2005 landslide 12/30/2004 1/19/1995 1/9/2005 1/29/1995 1/19/2005 2/8/1995 4 Mar 1995 landslide 2/18/1995 2/28/1995 3/10/1995 3/20/1995 3/30/1995 We combined both the microtopography features from the DEM and canopy openness in the DSM to establish an assess- ment procedure for landslide hotspot extraction. In continuous precipitation, in the third phase, basins of more than 2000 km2 in area reach their first critical stage. Figure 5: La Conchita landslide events of 1995 (left) and 2005 (right). This can be done either permanently by zoning or temporarily by debris flow warning and evacuation measures. The Alps region has harsh winters and moderately warm summers with abundant rainfall. He said the remaining houses are in … study, the destructive flood in the Gao-ping river in southern Taiwan, caused by Typhoon Morakot, was selected as an area for case analysis. Such situations usually happen during short-lasting heavy summer rainstorms or in late spring, when snow melt combines with intense rainfall. Privacy In more viscous surges a bouldery embankment developed at the front and was shoved along by the material following behind. This paper describes the development and application of a twodimensional finite difference model (FLO-2D) model to simulate the debris flow over a fixed substrate. View Test Prep - La Conchita California 2005 from SCIENCE 201 at Brigham Young University, Idaho. hills area, and the domestic geological conditions are very complicated. This is Part I of a two-part causation analysis of the January 10, 2005 La Conchita, California, USA landslide. From December 27, 2004 through January 10, 2005, the nearby city of Ventura received 378 millimeters (14.9 inches) of rainfall, only slightly less than its mean annual total of 390 millimeters (15.4 inches). Waters overflow levees, flooding villages and towns to various widths and depths and sometimes claiming casualties. On June 24, 1940, a large debris flow partially destroyed the town of Santa Cruz Pueblo Nuevo. On the basis of above-mentioned analysis, Next: La Concitas Comparison - Up: Case Studies Previous: Arent 3 Soil Description. The railway from Dongchuan to Kunming, a highway and Tuanjie irrigation canal pass through the lower reach of the Laogan Ravine. Before this event happened there were fifteen days of huge amounts of rain. The community lies on a narrow strip of land about 250 meters (820 feet) wide between the shoreline and abutting a 180-meter 1590 Ft) high bluff. The violent flow causes severe problems mainly along valley bottoms of rivers with basins up to 2000 km2 in area. In 1995, A Large Landslide Occurred, Damaging About A Dozen Homes. the southern of China continuously, in the area of Wuyishan and Xianxialing it meets the cold air current which comes from The complete lack of historical landslide information and geotechnical data precludes the development of quantitative deterministic or probabilistic models. For a USGS rerpot on this event, please see USGS Open-file report, "Landslide Hazards at La Conchita, California." This study investigates the mechanism and the entire process of rainfall-induced deep-seated landslides forming two massive dams in the Kuridaira and Akatani valleys, respectively. One sample of the fluid debris had a density of 2.4, indicating a water content of 25–30 per cent by weight. Geomorphic settings and landslide mobility are major contributing factors to the dam formation. irrigation canal, total economic losses was 19.5 million Yuan. 2005 La Concitas. The fundamental mode of Sanyanyu Gully loose mass converted to the components of debris flow included collapse and landslide deposited directly or fluvial eroded and transported by jamming trench: The fine grain material of gully slope's remnant slope sediment, the landside mass, the collapse body flowed into the trench under the rainfall's surface erosion function, supplied the debris flow and increased its viscosity; The early debris flow deposit in trench was eroded and transported directly, constituted the debris flow mass. The landslide is … By Nick Madigan and Charlie Leduff. and geology is, Access scientific knowledge from anywhere. Storm Question: PART 4: LA CONCHITA CASE STUDY La Conchita Is A Small Coastal Community Near Ventura, CA. Santa Barbara County Ventura County Pacific Ocean Santa Barbara Ventura Ojai 1 0 1 1 50 1 50 33 La C onchita C a l i f o r n i a N. ¾180-m-high bluff ¾~350 slslope ¾Monterey Formation in … Part II of this paper defines and describes the landslide issues in California. La Concitas - 2005. In this, Extreme heavy rainfall due to Typhoon Talas on September 2–4, 2011 in the Kii Peninsula, Japan, triggered numerous floods and landslides. The total duration of rainfall usually has a greater effect on these landslides than does the number of short periods of very intensive precipitation. Unfortunately, such an event has not been uncommon to the area in the last few hundred years. Since 1865, there have been five major landslides that have been recorded in the area. Natural systems are very complex, and reliable modification of debris flow behaviour requires a degree of understanding not yet available. This is Part I of a two-part causation analysis of the January 10, 2005 La Conchita, California, USA landslide. The results showed that the landslide area, mean sliding depth, and volume of the landslide in Hongye Village were approximately 4.5 ha, 5.1 m, and 22.8•104 m3, respectively. ... ← CASE STUDY SUMMARY_TODD. 75 other residences were evacuated after the slide. International Journal of Safety and Security Engineering. A heuristic model was applied to a rural municipality in eastern Cuba. The 1995 landslide had a horizontal length, vertical length, and depth of 120 x 330 x 30 m and covered approximately 10 acres with a volume of 1.3x106 m3. The test results indicate that the failure of samples is triggered by excess pore water pressure generation under a shear displacement from 2 to 7 mm with a pore pressure ratio ranging from 0.33 to 0.37. First bedrock landslides can occur, reaching a considerable area density, with volumes from a few hundred up to about one to two million cubic meters. Debris or earth material that moves downslope due to the combination of an outside force and gravity. The 1995 landslide had a horizontal length, vertical length, and depth of 120 x 330 x 30 m and covered approximately 10 acres with a volume of 1.3x106 m3. The flow advanced in successive waves or surges of “slimy gray cement-like” mud containing abundant stones. To read the full-text of this research, you can request a copy directly from the authors. Importantly, computer simulation with LS-RAPID software using input parameters obtained from physical experiments is employed to interpret the entire formation process of the abovementioned two landslide dams. Laogan Ravine is a tributary of Xiaojiang River which is a branch of the Yangtse River in North-eastern Yunnan province, China. Although the slope Notice the dirt road that traverses the hillside above the town. and it is in the geologic province of the Transmexican Volcanic Belt in the center of Mexico. LA CONCHITA, CA - DECEMBER 07: A man bicycles past bluffs burned in the Thomas Fire on December 7, 2017 in La Conchita, California. The landslide killed 10 people, and destroyed or damaged dozens of houses. All right reserved. On January 10, 2005, a major landslide occurred in the town of La Conchita, Ca. 8%). Nanping City is an area where geological calamities occur frequently The landslide is located in a complex and active tectonic setting. In spring and summer, as the southwest warm and humid air current rising into The January 10, 2005 La Conchita Landslide Philip J. Shaller 1 , Parmeshwar L. Shrestha 1 , Macan Doroudian 1 , Douglas L. Hamilton 1 , and David W. Sykora 2 1 Exponent, 320 Goddard Way Suite 200, Irvine, CA 92618 2 Exponent, 9 Strathmore Road, Natick, MA 01760 Typically occur within proximity to mountain ranges. On January 10, 2005, a landslide struck the community of La Conchita in Ventura County, California, destroying or seriously damaging 36 houses and killing 10 people. During Typhoon Morakot, the flood level was beyond the design limit of many river embankments in southern Taiwan. In recorded history, as many as 22 landslide dams have formed upstream of the Shinano River and the Hime River, in the northern, Northern Italy is a geomorphologically heterogeneous region: high mountains, wide valleys, gentle hills and a large plain form a very varied landscape and influence the temperate climate of the area. Explain how you can tell? The three-phase sequence has been identified in three severe events that are analysed in this paper: Valtellina (Lombardy) in 1987, Tanaro Valley (Piedmont) in 1994 and Aosta Valley in 2000; but this sequence has also been observed during other events that occurred in northern Italy: in Piedmont in 1968, 1977, 1978, 1993 and 2000; in Lombardy in 1983 and 1992; in the Aosta Valley in 1993. fourth-highest elevation in Mexico (4,662 m a.s.l.) The area approach consisted of 2 main dams with total height of 17.5m, 1080 m draining channel, 60 long catch drain, 4 fixing-bed dams, 155 m long protection dyke, 8 check dams and afforestation of 160 ha. Based on what you see in the two sets of photos, which event - 1995 or 2005 - was more deeply seated and which was shallower? The area upstream of the landslide dam is submerged under water and the downstream area is flooded when the landslide dam breaks. The high intensity and accumulation of rainfall induced floods, landslides and debris flows. On March 4, 1995 at 2:03 p.m. PST, the La Conchita landslide failed and moved tens of meters in only a few minutes. The landslide occurred on part of a previous landslide that occurred in 1995. First, hydrological and geomorphological data for historical typhoons together with rainfall data were collected and analyzed. The Study of the Topography-Measure Applied in China's Southwest Precipitous Areas a Case Study in Y... Research on the reservoir induced seismicity type identification and trend-forcasting system in the... Estimating peak flow-discharge during extreme rainfall events for the Gao-Ping River, Taiwan. Next, the rational method, combined with a number of equations, was proposed to estimate peak flow-discharges in the river produced by extreme rainfall events. This area has experienced two massive landslides in the past decade: March 4, 1995, and January 10, 2005. 31. In 2005 a landslide with over 400,000 tons of mud destroyed over 20 houses and killed ten people. Shallower? Owing to such complex factors as deep valleys, steep mountains, varied topography and complex geological structures, it is extremely hard for people to obtain exact leveling data about this area. Additionally, shear displacement control tests show that a certain amount of shear displacement between 2 and 7 mm along the sliding surfaces of the gravitationally deformed slopes might have led to the failures. Seventy-one homeowners sued La Conchita Ranch Co. in Bateman v. La Conchita Ranch Co. The community lies on a narrow strip of land about 250 meters (820 feet) wide between the shoreline and abutting a … part of Nagano Prefecture in central Japan, and all except three have subsequently broken. The 2005 landslide mobilized the south flank of a larger landslide that occurred in March 1995, and destroyed 9 homes. Velocities of the surge fronts ranged from a few to nearly 15 feet per second and averaged close to 10 feet per second during the more fluid phases. Appeal Analysis BACKGROUND Heavy rains of January 1995 led to a March 4, 1995, landslide in the LaConchita Ranch Community in Ventura County (County), California, covering 300 feet of Vista Del Rincon (VDR) Drive with 7-8 feet of mud and debris. Over 30,000 m3 of wet debris was mobilized in the event, which formed two distinct lobes of debris. Information describing 603 terrain units was collected in a, Through the field investigation of Sanyanyu Valley in Zhouqu county where occurred the giant flush flood and debris flow on August 8, 2010, the author summarized the geological environment background of loose solid material sources from several aspects of topography, stratum lithology, geological structure, hydrological geology, new tectonic movement and earthquake. Improved prediction of debris flow characteristics is needed so that reliable modification of debris flow behaviour might eventually become possible, without unacceptable environmental and social impacts. 2005 La Conchita Landslide Review of Landslides 1 What is it? Analysis of material sources derived from Sanyanyu debris flow in Zhouqu county, The Analysis of Geological Calamity and Countermeasures for Nanping City Fujian Province. This material impacted and locally breached the temporary wall, but did not flow into the community below. Part IV discusses options for land use controls that could help prevent landslide destruction. Nanping city belongs to middle-low mountains and hills 3. No breaker-like motion was evident, although the top of the front tended to shoot ahead of the base. © 2018, Chinese Soil and Water Conservation Society. LA CONCHITA, CALIFORNIA 2005 RICHARD HANSON, KRISTEN DALRYMPLE, BRACKON TAYLOR LOCATION La Conchita Study Resources 27. Why do they occur? They can be a result of Describe two ways in which heavy rains would cause the slope to become less stable. Figure 5: Essentially the same tragedy strikes La Concitas (Conchita) a decade after the first landslide. In 2005, a second event occurred, killing 10 people, injuring 14 more, destroying 15 houses, outright, and damaging 16 more beyond repair. Events. Part III presents a case study comparison between La Conchita and Laguna Beach. Debris was transported 15 miles by the mudflow, and on a gradient as low as 75 feet per mile at the outer extremity. In the need of preventing and reducing geological calamities in the future, the status quo, characteristics It was triggered by two weeks of heavy rainfall, which initiated a failure in the backscarp of a large slump that had occurred ten years earlier. The rapid movement of landslides is mainly attributed to high mobility due to the liquefaction behavior of both sandstone-rich and shale samples. Drone photography and three-dimensional modeling techniques were used to measure the sediment transportation process and conduct postdisaster influence area mapping. The different landforms and the causative factors for landslides were analyzed and used to develop the heuristic model. Next: La Concitas Comparison - Up: Case Studies Previous: 1995 La Concitas. 2005 La Conchita landslide The 2005 La Conchita Landslide occurred at the end of a 15–day period of near-record rainfall levels . among Fujian province. As a prevention to future debris flow, have been constructed walls of containment (gabions) along the principal channel of the river La Ciénaga, nevertheless in every rainy season the gabions are saturated and frequently destroyed, which shows the intense activity of the remove gravitational processes. Field validation indicated that the landslide-prone area and subsidence features on the forest canopy could be recognized using a sky-view factor relief and local relief model. This can provide important information about avalanche speeds. The historic slides are part of the larger Rincon Mountain slide, which "started many thousands of… It is shown that the conventional theory is physically unrealistic for flowing snow modeled as a frictional material. Development of such models will require major improvements in field observations of debris flow occurrence and behaviour; in debris flow rheology; and in the generation of realistic data from dynamically similar laboratory physical models, to supplement field data until that becomes available. The landslide hazard map was used in combination with existing information on buildings and infrastructure to prepare a qualitative risk map. La Conchita Landslide (between Santa Barbara and Ventura): 10 people killed. The volcano has the, Since the area of Southwest China crosses the first ladder and the second one ,thus it is featured with precipitous terrains. However, moist and water-saturated landslides plot well within the log(volume) versus H/L envelope for dry terrestrial landslides and exhibit overlapping ranges of estimated Bingham plastic yield strength values with dry landslides, indicating that moist and water-saturated landslides must travel much like dry rock avalanches of similar volume. It buried the towns of Yungay and Case Study 3 Frank Slide, Canada 1903 This landslide swept the Northwest Territories of Frank Canada. During early May of 1941 the southern California mountain resort of Wrightwood was partly inundated by surging flows of muddy debris which occurred daily for more than a week. Analyses of major events that have struck northern Italy over the last 35 years have provided numerous useful data for the recognition of various rainfall-triggering processes and their sequence of development in relation to the intensity and duration of rainfall. From December 27, 2004, through January 10, 2005, the nearby city of Ventura received 378 millimeters (14.9 inches) of rainfall, only slightly less than its mean annual total of 390 millimeters (15.4 inches).

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