Dam Break Analysis of Gembong Dam Using Zhong Xing HY21

Abstract Dams are a form of effort to conserve or protect water resources. The function of the Dam as a reservoir for water, irrigation, power generation, and flood control. However, in addition to its huge benefits, dam construction also can endanger the community’s safety, namely in the form of dam breaks. The main causes of dam break are overtopping and piping. So that analysis is needed related to dam break to minimize the impact. Based on the Zhong Xing HY21 software, the most severe impact of the break of the Gembong Dam was due to overtopping using the QInflow PMF design flood of 724.142 m3/s. It resulted in an inundation area of 54.682 km2 with a maximum inundation height of 5.129 m. As a result of the break of the Gembong Dam, 37 villages downstream of the Gembong Dam were flooded. There are 80.819 people affected by this risk. It is stated that all affected villages are at the 4th hazard classification level or very high hazard.

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KAJIAN PENANGANAN BANJIR DENGAN SISTEM POMPA DI SUNGAI BENDUNG PALEMBANG

JURNAL SUMBER DAYA AIR ◽

10.32679/jsda.v17i1.684 ◽

2021 ◽

Vol 17 (1) ◽

pp. 49-58

Author(s):

Heru Gunawan ◽

Anis Saggaf ◽

Sarino .

Keyword(s):

Numerical Model ◽

Flood Control ◽

River Channel ◽

Pump System ◽

Inundation Area ◽

River Flood ◽

Inundation Duration ◽

Alternative Scenarios ◽

Inundation Height ◽

The Impact

Floods around the Bendung River in Palembang City have caused material and non-material losses. One of the reasons was the decreasing river capacity and backwater during the Musi River flood season, which is the Bendung River's outlet. This paper discusses the impact of adding a pump system to reduce flood impact. 1-dimensional and 2-dimensional numerical model using MIKE 11 and MIKE FLOOD were made to analyze the best measures. Various alternative scenarios were implemented in the model. Based on the modeling results, using the most optimal alternative, alternative 4 with 6 pumps of 36 m3/s and normalization of the Bendung River channel by 1 meter. The inundation area was reduced by 0.74 km2. Also, the maximum inundation height for the flood decreased by 0.6 meters, and the inundation duration was reduced by 8.5 hours. These modeling results can be a reference for managers and policymakers in managing flood events.Keywords: River channel normalization, pump system, numerical model, flood control, Bendung river

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Influence of Ciawi and Sukamahi dam construction on flood early warning system in Katulampa weir

MATEC Web of Conferences ◽

10.1051/matecconf/201927604016 ◽

2019 ◽

Vol 276 ◽

pp. 04016

Author(s):

Maulana Asrafi ◽

Evi Anggraheni ◽

Dwita Sutjiningsih

Keyword(s):

Early Warning ◽

Early Warning System ◽

Flood Control ◽

Warning System ◽

System Level ◽

Dam Construction ◽

Monitoring Point ◽

Flood Peak ◽

Flood Level ◽

The Impact

Based on the Comprehensive Flood Management Plan (CFMP), one of the flood control alternatives in the Ciliwung Watershed is using the dry dam construction. Construction of Ciawi dam and Sukamahi dam who are located in Bogor District, are expected to decrease the flood peak and increasing the time concentration in order to reduce the impact caused by a flood in DKI Jakarta due to Ciliwung River. With the construction of Ciawi dam and Sukamahi dam, it is necessary to conduct a research on the effect of both dams construction in Katulampa Weir, one of monitoring point dams on the DKI Jakarta Flood Early Warning System. Hydrological analysis with Win-TR 20 and HEC-RAS was conducted to identify the changes in the flood level of Flood Early Warning System in DKI Jakarta with and without both dams are available. The results of this study indicate that the peak floods decreased by around 2.5% after the implementation of Ciawi dam and Sukamahi dams. The impacts of this reduction will not affect the Flood Early Warning System level at Katulampa Weir significantly.

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Flood Inundation Prediction of Logung River due to the Break of Logung Dam

Journal of the Civil Engineering Forum ◽

10.22146/jcef.28109 ◽

2017 ◽

Vol 3 (2) ◽

pp. 331 ◽

Cited By ~ 1

Author(s):

Listyo Rini Ekaningtyas

Keyword(s):

Return Period ◽

Flood Hazard ◽

Maximum Velocity ◽

Dam Break ◽

Peak Discharge ◽

Design Flood ◽

Channel Routing ◽

Inundation Area ◽

Probable Maximum Flood ◽

Simulation Results

The construction of Logung Dam in Kudus Regency is aimed to reduce the inundation area at downstream of Logung River, particularly during the rainy season. Besides, the potential water of Logung Dam is used for for irrigation and non-irrigation services. In order to mitigate the flood disaster that may arise in the downstream area, various preparedness should be established including the identification of flood hazard characteristics that may be caused by the break of the Logung Dam. This paper presents the results of Logung Dam break analysis using the levee pool routing model and the 2-D channel routing of the HEC-RAS 5.0 Version software. The initial value of breach parameter was calculated using the Froehlich’s equation, and variation of breaking times (1, 2, and 3 hours) were applied to study the generated hydrograph based on the corresponding elevation-storage curve. Furthermore, the simulation of channel routing at downstream of the dam was carried out in three different scenarios based on the bridges condition at downstream of the Logung Dam. Scenario 1 assumed that bridges will be safe enough against flood. Scenario 2 assumed that the bridges would only be safe at flood with return period lower than 20 years, whereas the scenario 3 assumed that bridges would be collapsed due to the flood at design flood with several return periods. The simulation results showed that the Probable Maximum Flood (PMF) with peak discharge of 1,303.60 m3/s did not generate overtopping. The peak discharge through the dam body was 15,022 m3/s at the first 40 minutes. It took 7 hours and 30 minutes to decrease the water level of the reservoir from +95.2 m to +38 m. In scenario 2, the simulation used 20 years return period flood with velocity in cross section before the Bridge RS 3700 was 7.21 m/s and before Bridge RS 6800 was 5.72 m/s. Furthermore, the 2-D simulation results showed that at the near downstream of the Logung Dam, the maximum depth was 55 m and the maximum velocity was 39 m/s. Several prone areas to flood caused by the dam break are the villages at the left side of the downstream Logung River including Bulung Cangkring, Bulung Kulon, Sidomulyo, Pladen and Jekulo village.

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Do Prospective Teachers Care About PISA Studies? A Pilot Study among University Students in Germany

International Education Studies ◽

10.5539/ies.v10n5p26 ◽

2017 ◽

Vol 10 (5) ◽

pp. 26 ◽

Cited By ~ 1

Author(s):

Olga Ioannidou ◽

Despoina Georgiou ◽

Andreas Obersteiner ◽

Nilufer Deniz Bas ◽

Christine Mieslinger

Keyword(s):

Teacher Education ◽

University Students ◽

Prospective Teachers ◽

International Student ◽

Teacher Education Program ◽

Student Assessment ◽

International Student Assessment ◽

The Impact ◽

Very High ◽

Expected Outcomes

The results of international comparison studies such as the Program for International Student Assessment (PISA) have initiated intense discussions about educational reforms in Germany. Although in-service and pre-service teachers are an essential part of such reforms, little is known about their attitudes towards PISA studies. The present study aims to fill this gap through the investigation of pre-service teachers’ awareness, interest, perception, and attitudes towards PISA. A questionnaire was used to survey a sample of 107 university students who were participating in a teacher education program. The results reveal that 100% of the participants are aware of PISA. Nearly 69% of the participants think that the impact of PISA is rather high or very high, while 41% of them believe that PISA results are reliable. Accordingly, half of the participants seem to be interested in PISA results for their country. The present study discusses these findings in the light of the expected outcomes as proposed in standards for teacher education.

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Stochastic simulation for determining the design flood of cascade reservoir systems

Hydrology Research ◽

10.2166/nh.2011.002 ◽

2012 ◽

Vol 43 (1-2) ◽

pp. 54-63 ◽

Cited By ~ 6

Author(s):

Baohong Lu ◽

Huanghe Gu ◽

Ziyin Xie ◽

Jiufu Liu ◽

Lejun Ma ◽

...

Keyword(s):

Simulation Model ◽

Stochastic Simulation ◽

Southern China ◽

Flow Simulation ◽

Simulation Method ◽

Simulation Approach ◽

Design Flood ◽

Design Values ◽

Stochastic Simulation Model ◽

The Impact

Stochastic simulation is widely applied for estimating the design flood of various hydrosystems. The design flood at a reservoir site should consider the impact of upstream reservoirs, along with any development of hydropower. This paper investigates and applies a stochastic simulation approach for determining the design flood of a complex cascade of reservoirs in the Longtan watershed, southern China. The magnitude of the design flood when the impact of the upstream reservoirs is considered is less than that without considering them. In particular, the stochastic simulation model takes into account both systematic and historical flood records. As the reliability of the frequency analysis increases with more representative samples, it is desirable to incorporate historical flood records, if available, into the stochastic simulation model. This study shows that the design values from the stochastic simulation method with historical flood records are higher than those without historical flood records. The paper demonstrates the advantages of adopting a stochastic flow simulation approach to address design-flood-related issues for a complex cascade reservoir system.

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The impact of capacity building on community leadership for bui communities impacted by dam construction

African Geographical Review ◽

10.1080/19376812.2020.1866044 ◽

2021 ◽

pp. 1-25

Author(s):

Jones Lewis Arthur

Keyword(s):

Capacity Building ◽

Community Leadership ◽

Dam Construction ◽

The Impact

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Innovative concepts for the usage of veneer-based hybrid materials in vehicle structures

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420721998398 ◽

2021 ◽

pp. 146442072199839

Author(s):

DB Heyner ◽

G Piazza ◽

E Beeh ◽

G Seidel ◽

HE Friedrich ◽

...

Keyword(s):

Steel Strip ◽

High Energy ◽

The Body ◽

Vehicle Body ◽

Material System ◽

Laminated Veneer Lumber ◽

Hybrid Beam ◽

Bending Load ◽

The Impact ◽

Very High

A promising approach for the development of sustainable and resource-saving alternatives to conventional material solutions in vehicle structures is the use of renewable raw materials. One group of materials that has particular potential for this application is wood. The specific material properties of wood in the longitudinal fiber direction are comparable to typical construction materials such as steel or aluminum. Due to its comparatively low density, there is a very high lightweight construction potential especially for bending load cases. Structural components of the vehicle body are exposed to very high mechanical loads in the case of crash impact. Depending on the component under consideration, energy has to be absorbed and the structural integrity of the body has to be ensured in order to protect the occupants. The use of natural materials such as wood poses particular challenges for such applications. The material characteristics of wood are dispersed, and depend on environmental factors such as humidity. The aim of the following considerations was to develop a material system to ensure the functional reliability of the component. The test boundary conditions for validation also play a key role in this context. The potential of wood–steel hybrid design based on laminated veneer lumber and steel was investigated for use in a component subjected to crash loads such as the door impact beam. The chosen solution involves a separation of functions. A laminated veneer lumber-based beam was hybridized with a steel strip on the tension side. The steel strip was designed to compensate the comparatively low elongation at fracture of the wood and to ensure the integrity of the beam. The wooden component was designed for high energy absorption due to delamination and controlled failure during the impact, while maintaining the surface moment of inertia, i.e. the bending stiffness of the entire component. This approach was chosen to ensure the functional safety of the component, avoid sudden component failure and utilize the high potential of both materials. The tests carried out provided initial functional proof of the chosen solution. The hybridization achieved significantly higher deformations without sudden failure of the beam. In addition, bending capabilities were increased significantly compared to a beam without hybridization. In comparison with a state-of-the-art steel beam, the hybrid beam was not able to achieve the maximum deformation and the target weight of the hybrid beam. Further optimization of the hybrid beam is therefore necessary.

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Addition of Flucytosine to Fluconazole for the Treatment of Cryptococcal Meningitis in Africa: A Multicountry Cost-effectiveness Analysis

Clinical Infectious Diseases ◽

10.1093/cid/ciz163 ◽

2019 ◽

Vol 70 (1) ◽

pp. 26-29 ◽

Cited By ~ 3

Author(s):

Tinevimbo Shiri ◽

Angela Loyse ◽

Lawrence Mwenge ◽

Tao Chen ◽

Shabir Lakhi ◽

...

Keyword(s):

Sensitivity Analysis ◽

Cost Effectiveness ◽

Cryptococcal Meningitis ◽

Cost Effective ◽

Immunodeficiency Virus ◽

The Mean ◽

The Cost ◽

The Impact ◽

Costing Analysis ◽

Very High

Abstract Background Mortality from cryptococcal meningitis remains very high in Africa. In the Advancing Cryptococcal Meningitis Treatment for Africa (ACTA) trial, 2 weeks of fluconazole (FLU) plus flucytosine (5FC) was as effective and less costly than 2 weeks of amphotericin-based regimens. However, many African settings treat with FLU monotherapy, and the cost-effectiveness of adding 5FC to FLU is uncertain. Methods The effectiveness and costs of FLU+5FC were taken from ACTA, which included a costing analysis at the Zambian site. The effectiveness of FLU was derived from cohorts of consecutively enrolled patients, managed in respects other than drug therapy, as were participants in ACTA. FLU costs were derived from costs of FLU+5FC in ACTA, by subtracting 5FC drug and monitoring costs. The cost-effectiveness of FLU+5FC vs FLU alone was measured as the incremental cost-effectiveness ratio (ICER). A probabilistic sensitivity analysis assessed uncertainties and a bivariate deterministic sensitivity analysis examined the impact of varying mortality and 5FC drug costs on the ICER. Results The mean costs per patient were US $847 (95% confidence interval [CI] $776–927) for FLU+5FC, and US $628 (95% CI $557–709) for FLU. The 10-week mortality rate was 35.1% (95% CI 28.9–41.7%) with FLU+5FC and 53.8% (95% CI 43.1–64.1%) with FLU. At the current 5FC price of US $1.30 per 500 mg tablet, the ICER of 5FC+FLU versus FLU alone was US $65 (95% CI $28–208) per life-year saved. Reducing the 5FC cost to between US $0.80 and US $0.40 per 500 mg resulted in an ICER between US $44 and US $28 per life-year saved. Conclusions The addition of 5FC to FLU is cost-effective for cryptococcal meningitis treatment in Africa and, if made available widely, could substantially reduce mortality rates among human immunodeficiency virus–infected persons in Africa.

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VERY HIGH-ORDER SPATIALLY IMPLICIT SCHEMES FOR COMPUTATIONAL ACOUSTICS ON CURVILINEAR MESHES

Journal of Computational Acoustics ◽

10.1142/s0218396x01000541 ◽

2001 ◽

Vol 09 (04) ◽

pp. 1259-1286 ◽

Cited By ~ 254

Author(s):

MIGUEL R. VISBAL ◽

DATTA V. GAITONDE

Keyword(s):

Three Dimensional ◽

Radiation Condition ◽

Higher Order ◽

High Order ◽

High Frequencies ◽

Decomposition Strategies ◽

The Impact ◽

Spurious Modes ◽

Very High ◽

Computational Strategy

A high-order compact-differencing and filtering algorithm, coupled with the classical fourth-order Runge–Kutta scheme, is developed and implemented to simulate aeroacoustic phenomena on curvilinear geometries. Several issues pertinent to the use of such schemes are addressed. The impact of mesh stretching in the generation of high-frequency spurious modes is examined and the need for a discriminating higher-order filter procedure is established and resolved. The incorporation of these filtering techniques also permits a robust treatment of outflow radiation condition by taking advantage of energy transfer to high-frequencies caused by rapid mesh stretching. For conditions on the scatterer, higher-order one-sided filter treatments are shown to be superior in terms of accuracy and stability compared to standard explicit variations. Computations demonstrate that these algorithmic components are also crucial to the success of interface treatments created in multi-domain and domain-decomposition strategies. For three-dimensional computations, special metric relations are employed to assure the fidelity of the scheme in highly curvilinear meshes. A variety of problems, including several benchmark computations, demonstrate the success of the overall computational strategy.

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