scholarly journals Risk assessment of multireservoir joint flood control system under multiple uncertainties

2021 ◽  
Author(s):  
Quansen Wang ◽  
Jianzhong Zhou ◽  
Ling Dai ◽  
Kangdi Huang ◽  
Gang Zha
Keyword(s):  
Risk Assessment ◽  
Control System ◽  
Flood Control ◽  
Multiple Uncertainties

scholarly journals Risk Assessment and Decision-Making Based on Mean-CVaR-Entropy for Flood Control Operation of Large Scale Reservoirs

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 649 ◽  
Author(s):  
Quansen Wang ◽  
Jianzhong Zhou ◽  
Kangdi Huang ◽  
Ling Dai ◽  
Gang Zha ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Decision Making ◽  
Flood Control ◽  
Large Scale ◽  
Yangtze River Basin ◽  
Mean Value ◽  
Operation System ◽  
Control Operation ◽  
Flood Control Operation ◽  
Reservoir Flood Control Operation

The risk inevitably exists in the process of flood control operation and decision-making of reservoir group, due to the hydrologic and hydraulic uncertain factors. In this study different stochastic simulation methods were applied to simulate these uncertainties in multi-reservoir flood control operation, and the risk caused by different uncertainties was evaluated from the mean value, extreme value and discrete degree of reservoir occupied storage capacity under uncertain conditions. In order to solve the conflict between risk assessment indexes and evaluate the comprehensive risk of different reservoirs in flood control operation schemes, the subjective weight and objective weight were used to construct the comprehensive risk assessment index, and the improved Mahalanobis distance TOPSIS method was used to select the optimal flood control operation scheme. The proposed method was applied to the flood control operation system in the mainstream and its tributaries of upper reaches of the Yangtze River basin, and 14 cascade reservoirs were selected as a case study. The results indicate that proposed method can evaluate the risk of multi-reservoir flood control operation from all perspectives and provide a new method for multi-criteria decision-making of reservoir flood control operation, and it breaks the limitation of the traditional risk analysis method which only evaluated by risk rate and cannot evaluate the risk of the multi-reservoir flood control operation system.

scholarly journals A Case Study of Flood Risk Evaluation Based on Emergy Theory and Cloud Model in Anyang Region, China

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 420
Author(s):  
Zening Wu ◽  
Yuhai Cui ◽  
Yuan Guo
Keyword(s):  
Risk Assessment ◽  
Flood Risk ◽  
Flood Control ◽  
Flood Hazard ◽  
Cloud Model ◽  
Flood Disaster ◽  
Assessment System ◽  
Assessment Model ◽  
Flood Risk Assessment ◽  
Emergy Theory

With the progression of climate change, the intensity and frequency of extreme rainfall have increased in many parts of the world, while the continuous acceleration of urbanization has made cities more vulnerable to floods. In order to effectively estimate and assess the risks brought by flood disasters, this paper proposes a regional flood disaster risk assessment model combining emergy theory and the cloud model. The emergy theory can measure many kinds of hazardous factor and convert them into unified solar emergy (sej) for quantification. The cloud model can transform the uncertainty in flood risk assessment into certainty in an appropriate way, making the urban flood risk assessment more accurate and effective. In this study, the flood risk assessment model combines the advantages of the two research methods to establish a natural and social dual flood risk assessment system. Based on this, the risk assessment system of the flood hazard cloud model is established. This model was used in a flood disaster risk assessment, and the risk level was divided into five levels: very low risk, low risk, medium risk, high risk, and very high risk. Flood hazard risk results were obtained by using the entropy weight method and fuzzy transformation method. As an example for the application of this model, this paper focuses on the Anyang region which has a typical continental monsoon climate. The results show that the Anyang region has a serious flood disaster threat. Within this region, Linzhou County and Anyang County have very high levels of risk for flood disaster, while Hua County, Neihuang County, Wenfeng District and Beiguan District have high levels of risk for flood disaster. These areas are the core urban areas and the economic center of local administrative regions, with 70% of the industrial clusters being situated in these regions. Only with the coordinated development of regional flood control planning, economy, and population, and reductions in the uncertainty of existing flood control and drainage facilities can the sustainable, healthy and stable development of the region be maintained.

Flight control system design risk assessment

1995 ◽  
Author(s):  
Mark Anderson ◽  
Alex Suchkov ◽  
Pieter Einthoven ◽  
Martin Waszak
Keyword(s):  
Risk Assessment ◽  
Control System ◽  
System Design ◽  
Flight Control ◽  
Control System Design ◽  
Flight Control System

scholarly journals Effect of Internal Control System on Risk Assessment in the Nigeria Public Sector (A Study Answer Prepared)

2019 ◽  
Vol 05 (12) ◽  
pp. 714-724
Author(s):  
Muhammad Barkindo Umar ◽  
Jeremiah Yusuf Karfe ◽  
Gambo Sule ◽  
Ado Ahmed
Keyword(s):  
Risk Assessment ◽  
Control System ◽  
Public Sector ◽  
Internal Control ◽  
Internal Control System

scholarly journals Evaluation of flood risk as a step in determining the “Acceptable Risk” criteria. Case study: Dengkeng River, Klaten, Central Java

2021 ◽  
Vol 894 (1) ◽  
pp. 012045
Author(s):  
A Sarminingsih ◽  
M Hadiwidodo
Keyword(s):  
Control System ◽  
Return Period ◽  
Flood Risk ◽  
Flood Control ◽  
Public Works ◽  
Acceptable Risk ◽  
Performance Function ◽  
Central Java ◽  
Flood Discharge ◽  
Potential Risks

Abstract The planning of a flood control system in Indonesia is based on the planning criteria issued by the Ministry of Public Works. Flood control planning is based on flood discharge with a specific return period depending on the order of the river and the number of protected populations. Flood events in areas where the flood control system has been planned continue to occur almost every year, meaning that the probability of being exceeded is not as planned. This study is intended to evaluate the criteria for the magnitude of the designed flood discharge in flood control planning that considers the acceptable risk. Potential risks are evaluated against system reliability. The probability of failure of the flood control system occurs if the resistance is smaller than the load expressed as a performance function. By knowing the performance function associated with the level of flood risk, then the flood discharge can be selected with the appropriate return period according to the acceptable risk.

scholarly journals PENERAPAN SISTEM PENGENDALIAN INTERN TERHADAP PEMBERIAN KREDIT PADA PT PEGADAIAN (PERSERO) UNIT PELAYANAN CABANG KALIWUNGU

2020 ◽  
Vol 3 (1) ◽  
pp. 39
Author(s):  
Arini Amalia Rahma ◽  
Siti Mutmainah
Keyword(s):  
Risk Assessment ◽  
Control System ◽  
Internal Control ◽  
Qualitative Data ◽  
Secondary Data ◽  
Primary Data ◽  
Control Environment ◽  
Internal Control System ◽  
Information And Communication ◽  
And Control

<em>Internal control is a process carried out by the company to provide adequate guarantees for achieving control objectives. The objective of this Research is to find out the current internal control system that is applied at PT Pegadaian (Persero) Kaliwungu Branch Service in the process of granting credit. The next objective is to identify whether the components of internal control applied are according to COSO. The data used are qualitative data, primary data, and secondary data. The methods of collecting data are interview, observation, and questionnaire. For writing the Research uses descriptive and exposition methods. There are five components of internal control according to the Committee of Sponsoring Organization (COSO), they are Control Environment, Risk Assessment, Control Activities, Information and Communication, and Monitoring. The results of the discussion in the Research shows that the application of the internal control system for granting credit at PT Pegadaian (Persero) Kaliwungu Branch Service is in accordance with COSO internal control component, but the Control Environment and Control Activities has not been fully implemented.</em>

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