scholarly journals ESTIMATION OF FREQUENT PEAK FLOOD DISCHARGE FOR THE UPPER RAJANG RIVER BASIN IN SARAWAK, MALAYSIA

2020 ◽  
Author(s):  
JERRY BETIE CHIN ◽  
KHAMARUZAMAN WAN YUSOF ◽  
MUBASHER HUSSAIN
Keyword(s):  
River Basin ◽  
Flood Discharge ◽  
Peak Flood

scholarly journals Estimation of Peak Flood Discharge for an Ungauged River: A Case Study of the Kunur River, West Bengal

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Suvendu Roy ◽  
Biswaranjan Mistri
Keyword(s):  
River Basin ◽  
Peak Discharge ◽  
Wave Parameter ◽  
Sudden Increase ◽  
Hydrological Models ◽  
Gangetic Plain ◽  
Discharge Data ◽  
Channel Geometry ◽  
Flood Discharge ◽  
Peak Flood

Due to unavailability of sufficient discharge data for many rivers, hydrologists have used indirect methods for deriving flood discharge amount, that is, application of channel geometry and hydrological models, for the estimation of peak discharge in the selected ungauged river basin(s) in their research/project works. This paper has studied the estimation of peak flood discharge of the Kunur River Basin, a major tributary of the Ajay River in the lower Gangetic plain. To achieve this objective, field measurements, GIS technique, and several channel geometry equations are adopted. Three important geomorphic based hydrological models—manning’s equation, kinematic wave parameter (KWP), and SCS curve number (CN) method—have been used for computing peak discharge during the flood season, based on daily rainfall data of September, 2000. Peak discharges, calculated by different given models, are 239.44 m3/s, 204.08 m3/s, and 146.52 m3/s, respectively. The hydrograph has demonstrated the sudden increase with heavy rainfall from the 18th to the 22nd of September, 2000. As a result, a havoc flood condition was generated in the confluence zone of Ajay and Kunur Rivers. This hydrograph might be not only successful application for flood forecasting but also for management of the lower Ajay River Basin as well as the downstream area of Kunur Basin.

scholarly journals Influence of Landscape Retention Capacity Upon Flood Processes in Jičínka River Basin

2014 ◽  
Vol 62 (1) ◽  
pp. 191-199
Author(s):  
František Pavlík ◽  
Miroslav Dumbrovský
Keyword(s):  
River Basin ◽  
Daily Precipitation ◽  
Original Method ◽  
Important Criterion ◽  
Retention Capacity ◽  
Flood Discharge ◽  
Disastrous Flood ◽  
Final Profile

In a survey of landscape retention capability results of measurements obtained during the disastrous flood in June 2009 were used. The original method based on the balance among the daily precipitation fallen on the basin with discharges in the final profile was used on the analogy with transformation of the flood discharge through a reservoir. Following basin retention are defined: dynamic Rd, static Rs including the underground retention Rug and evaporation E, and total Rt. Main principal criteria were the effective static retention of the basin Rsef and a coefficient of the effective static basin retention ρsef (3). The coefficient of reducing flood culmination λcul (4) was calculated, too. Also investigated factors having the most influence on a retention capacity of a basin are introduced. Summary of results are shown in the Tab. I. Values of the most important criterion quantities are marked in shadow colour. The results show, for example, that the found out coefficient ρsef is 0.52. It means that the soil (and slightly a vapour, too) in the basin caught 52% of volume of wave in the time of culmination discharge in a basin. Also some further interested findings are introduced in the results and conclusions.

Peak Flood Discharge Confidence Limits

1969 ◽  
Vol 95 (1) ◽  
pp. 161-174
Author(s):  
Richard M. Shane ◽  
Walter R. Lynn
Keyword(s):  
Confidence Limits ◽  
Flood Discharge ◽  
Peak Flood

scholarly journals Geospatial Modelling of Watershed Peak Flood Discharge in Selangor, Malaysia

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2490 ◽  
Author(s):  
Ryan Cheah ◽  
Lawal Billa ◽  
Andy Chan ◽  
Fang Yenn Teo ◽  
Biswajeet Pradhan ◽  
...  
Keyword(s):  
Hydrological Modeling ◽  
Estimation Methods ◽  
Coefficient Of Determination ◽  
Storm Event ◽  
Storm Events ◽  
Unit Hydrograph ◽  
Runoff Simulation ◽  
Flood Discharge ◽  
Geospatial Modelling ◽  
Peak Flood

Conservative peak flood discharge estimation methods such as the rational method do not take into account the soil infiltration of the precipitation, thus leading to inaccurate estimations of peak discharges during storm events. The accuracy of estimated peak flood discharge is crucial in designing a drainage system that has the capacity to channel runoffs during a storm event, especially cloudbursts and in the analysis of flood prevention and mitigation. The aim of this study was to model the peak flood discharges of each sub-watershed in Selangor using a geographic information system (GIS). The geospatial modelling integrated the watershed terrain model, the developed Soil Conservation Service Curve Cumber (SCS-CN) and precipitation to develop an equation for estimation of peak flood discharge. Hydrological Engineering Center-Hydrological Modeling System (HEC-HMS) was used again to simulate the rainfall-runoff based on the Clark-unit hydrograph to validate the modelled estimation of peak flood discharge. The estimated peak flood discharge showed a coefficient of determination, r2 of 0.9445, when compared with the runoff simulation of the Clark-unit hydrograph. Both the results of the geospatial modelling and the developed equation suggest that the peak flood discharge of a sub-watershed during a storm event has a positive relationship with the watershed area, precipitation and Curve Number (CN), which takes into account the soil bulk density and land-use of the studied area, Selangor in Malaysia. The findings of the study present a comparable and holistic approach to the estimation of peak flood discharge in a watershed which can be in the absence of a hydrodynamic simulation model.

scholarly journals Quantifying the contribution of flood intensity indicators with the projection pursuit model

2017 ◽  
Vol 49 (1) ◽  
pp. 60-71 ◽  
Author(s):  
Lina Wang ◽  
Yanqing Lian ◽  
Xiaohong Chen
Keyword(s):  
Southern China ◽  
Projection Pursuit ◽  
Flood Events ◽  
Flood Duration ◽  
Flood Discharge ◽  
Wujiang River ◽  
Flood Volume ◽  
Projection Pursuit Model ◽  
Flood Intensity ◽  
Peak Flood

Abstract Identifying the various factors that affect the intensity of a flood event, such as its duration and volume, is essential for strategic planning and flood management. Further, quantifying the impacts of these major factors on flood intensity using the contribution rate is essential, but technically challenging. In this study, the authors have adopted the projection pursuit model to quantify the contribution rates of peak flood stage and peak flood discharge, flood duration, and total flood volume (the maximum 12-, 24-, and 72-hour flood volumes) in the Wujiang River in Southern China. This study showed that peak flood discharge and total flood volume were the two dominant factors impacting flood intensity. Although flood duration can be a major factor for some flood events, it contributed the least to flood intensity for most of the historic flood events studied. Likewise, the maximum 24-hour and 72-hour flood volumes contributed little to flood intensity. Findings from this study not only demonstrated the successful adoption of the projection pursuit model for contribution rates, but also provided critical information for planning and managing the regional hydraulic resources in the Wujiang River.

scholarly journals Perbandingan Perkiraan Debit Puncak Banjir Menggunakan Metode Nakayasu dan Metode FSR Jawa Sumatera untuk DAS Dombo Sayung

2020 ◽  
Vol 5 (2) ◽  
pp. 38
Author(s):  
Muhammad Syarifudin ◽  
Karuniadi Satrijo Utomo
Keyword(s):  
Natural Disaster ◽  
Rainy Season ◽  
Rainfall Data ◽  
Disaster Mitigation ◽  
Material Loss ◽  
Public Facilities ◽  
Flood Discharge ◽  
The Impact ◽  
Detrimental Impact ◽  
Peak Flood

Banjir merupakan salah satu bentuk bencana alam yang hingga saat ini masih belum dapat diselesaikan. Dampak banjir tidak hanya kerugian infrastruktur berupa jalan dan fasilitas umum akan tetapi kerugian materil menjadi bagian dari dampak yang merugikan bagi masyarakan. Padahal, bagi sebagian warga di Semarang dan Kabupaten Demak, banjir menjadi persoalan rutin pada musim penghujan. Daerah yang menjadi langganan banjir di Demak yaitu daerah Sayung, Karang Asem dan Mranggen. Banjir di daerah tersebut sulit diatasi bahkan semakin lama persoalan banjir tersebut semakin parah dan meluas. Dengan demikian penelitian ini bertujuan untuk mengetahui perbandingan perkiraan debit puncak banjir melalui dua metode yang berbeda. Berdasarkan pada hasil maka mitigasi bencana juga dapat ditingkatkan. Metode dalam penelitian ini menggunakan metode Nakayasu dan FSR Jawa Sumatera untuk mengukur debit puncak banjir dengan menggunakan rentang data curah hujan 10 tahun. Adapun hasil analisis menunjukkan bahwa debit banjir yang dianalisis dengan menggunakan metode Nakayasu menghasilkan debit banjir lebih besar daripada analisis debit banjir menggunakan FSR Jawa Sumatera. Hasil analisis dengan menggunakan metode Nakayasu diperoleh nilai terbesar untuk Sungai Penggaron 270,4 m3/detik. Sungai Dombo Sayung 296,4 m3/detik dan Sugai Dolok 332,2 m3/detik. Adapun, untuk Metode FSR Jawa Sumatera diperoleh nilai terbesar untuk Sungai Penggaron 112,7 m3/detik. Sungai Dombo Sayung 239,7 m3/detik dan Sugai Dolok 632,1 m3/detik.Kata kunci : debit banjir; dombo sayung; FSR Jawa Sumatera; nakayasu ABSTRACTFlooding is a form of natural disaster that has yet to be resolved. The impact of flooding is the loss of infrastructure in roads and public facilities, but a material loss is part of the community's detrimental impact. For some residents in Semarang and Demak Regency, flooding is a routine problem during the rainy season. Areas that are regularly flooded in Demak are Sayung, Karang Asem, and Mranggen. Floods in the area are challenging to overcome, even if flooding is getting worse and broader. Thus this study aims to determine the comparison of the estimated peak flood discharge through two different methods. Based on the results, disaster mitigation can also be improved. This study used Nakayasu and Java Sumatera FSR to measure the peak flood discharge using a ten-year rainfall data range. The analysis results show that the flood discharge analyzed using the Nakayasu method produces a more massive flood discharge than the flood discharge analysis using the Java Sumatra FSR. The analysis results using the Nakayasu method obtained the most significant value for the Penggaron River 270.4 m3/second. Sungai Dombo Sayung 296.4 m3/second and Sugai Dolok 332.2 m3/second. Meanwhile, for the Java Sumatra FSR Method, the most significant value was obtained for the Penggaron River 112.7 m3/second. Sungai Dombo Sayung 239.7 m3/second and Sugai Dolok 632.1 m3/second.

scholarly journals Features of the Maximum Water Flows of the Arpa River Under Modern Conditions

2021 ◽  
Vol 333 ◽  
pp. 02006
Author(s):  
Varduhi Margaryan ◽  
Levon Azizyan ◽  
Amalya Misakyan ◽  
Ekaterina Gaidukova ◽  
Gennady Tsibul’skii ◽  
...  
Keyword(s):  
Actual Data ◽  
Water Flows ◽  
Flood Discharge ◽  
Maximum Water ◽  
Monitoring Center ◽  
The Republic ◽  
Discharge Distribution ◽  
Peak Flood

The paper discusses the main regularities of the peak flood discharge distribution in modern conditions, using actual data of Hydrometeorology and Monitoring Center SNCO with Ministry of Environment of the Republic of Armenia on the peak flood discharge of the river Arpa.

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