scholarly journals Perencanaan Pembangunan

2021 ◽  
Author(s):  
Susiati Susiati
Keyword(s):  
Debris Flows ◽  
Mass Movements ◽  
Check Dam ◽  
Sediment Discharge ◽  
Rainfall Analysis ◽  
Sediment Volume ◽  
Flood Discharge ◽  
Calculation Results ◽  
Dam Building ◽  
The City

Abstarct.Ambon city, which mostly consists of hilly areas, is an area that is very highly susceptible to the occurrence of debris mass movements, both in the form of debris flows and landslides (debris flows, erosions, and slope failures). In the city of Ambon, rivers are passed such as Way Ruhu, Way Batu Merah, Way Tantui, Way Tomu, Way Batu Gajah and Way Batu Hang. The purpose of this paper is to plan the check dam building for Way Batu Merah – Ambon City. The method used is Hydrological Analysis: hydrology as the basis for planning the Q25 Check Dam Building, which consists of rainfall analysis and the basis for calculating the planned discharge used in planning, using the Sabo Technical Center method. From the calculation results, it is obtained that the planned Q25 flood discharge of the Way Batu Merah River is 516.43 m / year with a return period of 25 years, the sediment volume can be accommodated 22,102 m / year and controlled by the Check Dam 56,050 m / year, then with a sediment discharge of 60,685 m³ / year . By comparing the amount of sediment that enters the Check Dam with the capacity of the Check Dam, it is dredged again for 3.5 years.Keywords: Sediment; Hydrological Analysis; Checkdam; Sediment Discharge

scholarly journals Effectiveness and efficiency of slot-check dam system on debris flow control

2015 ◽  
Vol 3 (9) ◽  
pp. 5777-5804 ◽  
Author(s):  
Y. H. Zou ◽  
X. Q. Chen
Keyword(s):  
Debris Flow ◽  
Flow Control ◽  
River Basin ◽  
Debris Flows ◽  
Check Dam ◽  
Sediment Control ◽  
Sediment Volume ◽  
Check Dams ◽  
Effectiveness And Efficiency ◽  
Set Up

Abstract. Slot-check dam system is commonly used to control sediment transport associated with debris flows and mitigate debris flow hazards. This paper aims to estimate the performance of the slot-check dam system in the field and set up a verification to evaluate the efficiency of a slot-check dam system and each subsystem in debris flow sediment control. Field survey on a group of a series of slot-check dams at Shengou Basin in Yunnan, China reveals that the conserving sediment volume of each dam is related to its relative location in the group, gradually decreasing from upstream to downstream. The cumulative sediment volume within a subsystem of slot-check dams closely related to the characteristics of the catchment controlled by the subsystem. It increases with the controlled catchment area of the most downstream dam in subsystem and the distance from the dam to the upstream most. Evaluation models for the conserving efficiency of a slot-check dam system on debris flow control in a river basin and each subsystem within the group associate to the controlled catchment characteristics have been proposed. The layout principle of a slot-check dam system in a river basin has been developed based on the conserving efficiency of a subsystem of slot-check dams which would allow the slot-check dam system to be designed in a more scientific way.

scholarly journals Recent morphological evolution and slope instability in a hilly area of Piedmont (North Italy)

2000 ◽  
Vol 22 ◽  
Author(s):  
Giannantonio Bottino ◽  
Giuseppe Mandrone ◽  
Daniela Torta ◽  
Bartolomeo Vigna
Keyword(s):  
Tectonic Evolution ◽  
Morphological Evolution ◽  
Geophysical Methods ◽  
Slope Instability ◽  
Mitigation Measures ◽  
Mass Movements ◽  
Residential Areas ◽  
Hilly Area ◽  
Causative Factors ◽  
The City

In the hilly area of Langa, which is situated to the south of the city of Alba between the Belbo and Bormida Valleys, the heavy rainfall and subsequent floods of 3-6 November 1994 triggered numerous landslides. The slides caused serious damage to residential areas and various types of infrastructure. Engineering geological, geomorphological, geotechnical, hydrogeological, and geophysical methods were applied to investigate the instabilities. Among hundreds of failures, most of them were planar slides and debris-mud flows. However, the numerous landslides directly connected to the event represent only a part of the large and varied types of phenomenon in this area. In fact, most of the recent landslides can be considered as reactivated older ones that were more-or-less quiescent. They intersect at the depth the marly basement and are directly connected to the recent geological and tectonic evolution of the area. The paper describes the mass movements and their causative factors. It also focuses on the hazards and risks associated with the instabilities, and their mitigation measures.

scholarly journals Ivano-Frankivsk City Groundwater Landscapes Ecological State

2017 ◽  
Vol 11 (2) ◽  
pp. 247-253
Author(s):  
Gutsuleak Vasyl ◽  
Fomenko Nataliia
Keyword(s):  
Chemical Analysis ◽  
Urban Areas ◽  
Potable Water ◽  
Ecological State ◽  
Ecological Situation ◽  
Geochemical Monitoring ◽  
Geochemical Evaluation ◽  
Calculation Results ◽  
Maximum Allowable Concentrations ◽  
The City

Abstract Ecological state of groundwater used as a source of potable water in urban areas of the city of Ivano-Frankivsk and its satellites is dealt with. Groundwater is assessed as a ratio between the content of pollutants and the relevant hygiene standards. Environmental assessment grounded on the materials of chemical analysis (74 samples) compared to maximum allowable concentrations and background values. Calculations of the value of hazard and the intensity of pollutions were the methods of ecological and geochemical evaluation of groundwater contamination. Based on calculation results, geochemical maps were compiled depicting satisfactory, hazardous and critical degrees of hydro-ecological situation. Developed maps can serve for the purposes of further geochemical monitoring of ecological situation.

scholarly journals Why Earthquakes Threaten Two Major European Cities: Istanbul and Bucharest

2017 ◽  
Vol 26 (1) ◽  
pp. 30-49 ◽  
Author(s):  
Gregory A. Houseman
Keyword(s):  
Upper Mantle ◽  
Large Scale ◽  
Mass Movements ◽  
European Continent ◽  
European Cities ◽  
The North ◽  
Two Cities ◽  
The City ◽  
Large Earthquakes ◽  
Better Than

Istanbul and Bucharest are major European cities that face a continuing threat of large earthquakes. The geological contexts for these two case studies enable us to understand the nature of the threat and to predict more precisely the consequences of future earthquakes, although we remain unable to predict the time of those events with any precision better than multi-decadal. These two cities face contrasting threats: Istanbul is located on a major geological boundary, the North Anatolian Fault, which separates a westward moving Anatolia from the stable European landmass. Bucharest is located within the stable European continent, but large-scale mass movements in the upper mantle beneath the lithosphere cause relatively frequent large earthquakes that represent a serious threat to the city and surrounding regions.

scholarly journals Predicting Extreme-Precipitation Effects on the Geomorphology of Small Mountain Catchments: Towards an Improved Understanding of the Consequences for Freshwater Biodiversity and Ecosystems

Water ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 79 ◽  
Author(s):  
Stefano Segadelli ◽  
Federico Grazzini ◽  
Michele Adorni ◽  
Maria Teresa De Nardo ◽  
Anna Fornasiero ◽  
...  
Keyword(s):  
Extreme Precipitation ◽  
Debris Flows ◽  
Mitigation Measures ◽  
Convective System ◽  
Stream Channels ◽  
Freshwater Biodiversity ◽  
Rainfall Analysis ◽  
Extreme Precipitation Events ◽  
Hourly Rainfall ◽  
Precipitation Events

In 2015 an intense rainfall event hit the Valleys of the Trebbia, Nure, and Aveto watercourses in the Northern Apennines. In about 6 h a mesoscale convective system deployed a stunning amount of precipitation of 340 mm, with an extreme hourly rainfall intensity of >100 mm/h. It triggered debris flows along slopes and stream channels, landslides and floods, which caused serious damages. Through the optimal combination of rainfall data and radar volumes, in this work we present a detailed rainfall analysis, which will serve as a basis to create a quantitative correlation with debris flows over elementary hydrological units. We aim at providing an objective basis for future predictions, starting from the recognition of the forcing meteorological events, and then arriving at the prediction of triggering phenomena and to the debris-flow type. We further provide seven observations/case studies on the effects of extreme-precipitation events on freshwater environments in small mountain catchments. Extreme-precipitation events are becoming more frequent and widespread globally but their ecological effects are still insufficiently understood. In general, the effects of extreme events on inland-waters’ ecosystems are highly context-dependent, ranging from deleterious to beneficial. We therefore highlight the necessity of further studies to characterize these effects in more depth to be able to include appropriate mitigation measures in environmental planning and stewardship.

Runout Prediction of Debris Flows and Similar Mass Movements

2013 ◽  
pp. 221-229 ◽  
Author(s):  
Christian Scheidl ◽  
Dieter Rickenmann ◽  
Brian W. McArdell
Keyword(s):  
Debris Flows ◽  
Mass Movements

scholarly journals Mapeamento de Áreas Suscetíveis a Deslizamentos e Zoneamento de Risco no Município de Três Coroas-RS (Mapping of Areas Susceptible to Landslides and Risk Zoning in the City of Três Coroas-RS)

2016 ◽  
Vol 9 (2) ◽  
pp. 456
Author(s):  
Eduardo Samuel Riffel ◽  
Laurindo Antonio Guasselli
Keyword(s):  
Mass Movement ◽  
Mass Movements ◽  
Anthropogenic Influences ◽  
High Slope ◽  
Geomorphological Units ◽  
Risk Areas ◽  
Relationship Of ◽  
Steep Slopes ◽  
The Relationship ◽  
The City

Este trabalho consiste em um estudo realizado no município de Três Coroas - RS. Foram analisadas as ocorrências recentes de movimentos de massa e sua relação com as zonas de risco estabelecidas pela CPRM. A partir de parâmetros morfométricos, buscaram-se identificar os padrões de ocorrência de deslizamentos. Também buscou-se analisar a contribuição da ocupação para tais ocorrências, incluindo outros fatores que estão relacionados a movimentos de massa. A partir do padrão de ocorrência de movimentos de massa identificados no município, foi feito um mapa de áreas suscetíveis a movimentos de massa, dividido em 3 classes: alta, média e baixa suscetibilidade, e foi relacionado com as áreas de risco do município. Observou-se que algumas das ocorrências estão localizadas em áreas de vertentes côncavas e encostas íngremes, com exceção das que têm influências antropogênicas, que estão localizados em encostas convexas. Um fato que pode ser explicado pelo tipo de ocupação de área, que ocorre principalmente em pistas convexas e encostas íngremes, influenciada pela topografia da região. Pode-se também ver uma lista de ocorrências de deslizamentos de terra que resulta em áreas sensíveis para as áreas de risco estabelecidas pela CPRM, explicado pelo fato de que as ocupações geralmente se dão em áreas de alta declividade.   Abstract This work consists of a study conducted in the municipality of Três Coroas – RS. Recent occurrences of mass movements and their relationship to the risk areas established by CPRM were analyzed. From modeled geomorphological maps, geomorphological units, slope and altimetry, we sought to identify patterns in the occurrence of landslides. Also aimed to analyze the relationship of the occupation to the occurrence of such disasters, including other factors that are related to mass movements. From the pattern of occurrence of mass movements identified in the county, was made a map of susceptible to mass movement areas, divided into 3 classes: high, medium and low susceptibility, and it was related to the risk areas of the municipality. It was observed that some of the occurrences of mass movements are located in areas of concave slopes, and steep slopes, except for occurrences that have large anthropogenic influences, which are located on convex slopes. A fact that can be explained by the type of occupation of the area, which occurs mainly in convex slopes and steep slopes, influenced by the topography of the region. One can also see a list of occurrences of landslides and results areas as susceptible to the risk areas established by CPRM, explained by the fact that the occupations will generally give in areas of high slope. Keywords: Risk Areas. Mass Movements. Remote Sensing.     

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