scholarly journals Study of Flood and Coastal Flood Control in Madukoro Area, Semarang City, Indonesia

2018 ◽  
Vol 4 (3) ◽  
pp. 189
Author(s):  
Dian Wahyu Jatmiko
Keyword(s):  
Water Level ◽  
Land Subsidence ◽  
Return Period ◽  
Flood Control ◽  
High Tide ◽  
Northern Coast ◽  
Flood Peak ◽  
Runoff Volume ◽  
Total Runoff ◽  
Drainage Channels

Madukoro area located on the northern coast of Semarang City has been prone to flooding caused by rainfall and seawater high-tide. Ineffective flood control management and land subsidence are considered as the cause of this problem. In order to understand land subsidence effect and flood control performance, location, water surface height of the inundation in West Flood Canal, western part of Madukoro area need to analyze. Flood analysis was conducted using HEC-HMS software and rational method. Flow hydraulics on five channels, i.e. the West Flood Canal, Ronggolawe River, Karangayu River, Arterial Channel and Madukoro were analyzed using HEC-RAS software. Increasing levee level and additional water pumps in Madukoro and Ronggolawe were chosen as flood control alternatives. Its performance was investigated through software simulation. The results showed total runoff volume in all drainage channels for 2-years return period discharge was about 80% of capacity with 0.7 m water depth. Runoff volume in West Flood Canal with 50-years return period discharge was about 40%. Land subsidence 4 cm/year affected the water level increase on West Flood Canal. Operation of 2 - 4 pump units could not significantly decrease water level at flood peak, yet increase flood recession time 6 - 8 hours. 

scholarly journals Analysis Study Effect Of Surabaya's Northern Sea Tides On The Highway Drainage Channels (Case Study: Kedung Mangu Road, Sidotopo Wetan, Kenjeran, Surabaya)

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Sumarno Sumarno ◽  
Atik Wahyuni
Keyword(s):  
Rainfall Intensity ◽  
High Tide ◽  
Northern Coast ◽  
Analysis Study ◽  
Discharge Plan ◽  
Average Rainfall ◽  
Drainage Channels ◽  
Highway Drainage ◽  
Channel Edge

One of the roads that is still a subscription to flooding in Surabaya when it rains is on Kedung Mangu road. Besides being close to the northern coast of Surabaya, Kedung Mangu road channel edge is still very small and a lot of trash and sediment. In this study the authors used secondary Gumbel method using the data from relevant agencies and secondary of data from observations in the field. Reviews These rainfall of data include the data, the data pool of the data the tide and the dimensions of the existing channels and other auxiliary buildings. From the data and the calculation, the value of the average rainfall is 93.41 mm / day. Rainfall intensity 25-year period is 47.949 mm / hour. While the flood discharge plan is 174.859 m3 / h. Its existing discharge chute is 100 908 m3 / h. From the Data Obtained tide high tide value of 150 cm occurred on December 13, 2016 and to its Lowest ebb -130 cm occurred on January 25, 2016. Thet Type of Surabaya's northern sea tides is the mixed tide. From the calculation and analysis can be concluded that the more influential is the amount of rainfall and dimensions and road conditions in the channel Kedung Mangu. So as to cope with floods In These locations, the dimensions of the channel should be enlarged.

Impact of Sedimentation Counter Measure on the Performance of Flood Control: A Case Study of Wonogiri Reservoir

2018 ◽  
Vol 881 ◽  
pp. 78-85 ◽  
Author(s):  
Rachmad Jayadi ◽  
Istiarto ◽  
Ansita Gukitapingin Pradipta
Keyword(s):  
Water Level ◽  
Return Period ◽  
Flood Control ◽  
Reservoir Routing ◽  
Maximum Water Level ◽  
Flood Period ◽  
Probable Maximum Flood ◽  
Maximum Water ◽  
Overtopping Failure ◽  
Dam Overtopping

The Wonogiri Reservoir with 1.343 km2 catchment area has a major problem of sedimentation. To overcome this issue, a new spillway has been built and closure dike is being constructed to localize sediment inflow from the Keduang watershed. Study on the effect of the closure and overflow dike on the reservoir operation in flood period is necessary to evaluate the performance of flood control related to the flood risk in the downstream area of the reservoir. For this purpose, the reservoir routing simulation model was developed under two condition, namely old condition and new condition with the new spillway and closure dike. The reservoir routing simulation was conducted for three inflow hydrographs of 60 and 500 years return period, and probable maximum flood (PMF). The results show that the presence of closure dike causes the peak outflow discharge increases to 1.45%, 75.18% and 56.28% for inflow hydrograph of 60 years, 500 years return period and PMF, respectively. Furthermore, the maximum water level also increases by 0.3 m, 1.9 m and 0.9 m for those three new design floods respectively. In order to reduce the dam overtopping failure chance of the 500 years return period flood, it is recommended to operate full opening of the new spillway gate when the water level reaches elevation +135.6 m MSL.

scholarly journals Adaptation and Mitigation Model for People to Restore Their Ecosystem from Flood in Semarang, Indonesia

2015 ◽  
Vol 16 (2) ◽  
pp. 166
Author(s):  
Muzakar Isa ◽  
FX. Sugiyanto ◽  
Indah Susilowati
Keyword(s):  
Flood Control ◽  
High Tide ◽  
Capital City ◽  
Northern Coast ◽  
Junction Area ◽  
Central Java ◽  
The People ◽  
Central Java Province ◽  
Adaptation And Mitigation

The northern coast of Central Java province is considered as the critical area of flood path. Semarang as capital city of this province with its junction area of Kendal and Demak always suffering from flood due to rain and or high tide seawater. It is realised that infrastructures’ capacity for flood control, awareness of people and other multi-factors are significantly contributed on the flood problem in these area. Mixed-methods of quantitative and qualitative are employed to analyze the data. The study found that there was a decline in quality of - people’s life, environment and its ecosystem. Awareness and responsiveness of people and also the other stakeholders are not progressive to overcome the problem of flood. This study is trying to contribute in outlining a model of adaptation and mitigation for the people to restore their ecosystem from the perspective of economist.

scholarly journals INSIGHT ANALYSIS ON DYKE PROTECTION AGAINST LAND SUBSIDENCE AND THE SEA LEVEL RISE AROUND NORTHERN COAST OF JAVA (PANTURA) INDONESIA

2018 ◽  
Vol 5 (1) ◽  
pp. 101
Author(s):  
Heri Andreas ◽  
Hasanuddin Zainal Abidin ◽  
Dina Anggreni Sarsito ◽  
Dhota Pradipta
Keyword(s):  
Global Warming ◽  
Sea Level Rise ◽  
Sea Level ◽  
Land Subsidence ◽  
High Tide ◽  
Northern Coast ◽  
Tidal Inundation ◽  
Land Area ◽  
The City ◽  
Area Development

Land subsidence and the sea level rise is newly well known phenomenon around northern coast of Java Indonesia (PANTURA). The occurrence of land subsidence at least recognize at the first of the city or urban area development, while the sea level rise was recognize from several last decades corresponds to the global warming. Following the both phenomena, tidal inundation (in Javanese they call it “Rob”) is now becoming another newly well known phenomenon along PANTURA. In the recent years the tidal inundation comes not only at a high tide but even at the regular tide in some area. Sea level rise and the land subsidence are considered as the causes deriving the occurrence of tidal inundation. Dykes have been built against tidal inundation around PANTURA (e.g. in Jakarta, Blanakan, Pekalongan, Semarang, and Demak). Nevertheless, since the land subsidence and the sea level rise are believed to be continuing through times, insight analysis on these dykes “protector” is necessary. How long the dyke would effectively protect the land area would be highlight in this paper.

scholarly journals Uncertainty analysis of flood control design under multiple floods

2020 ◽  
Author(s):  
Yuming Huang ◽  
Yanjie Li ◽  
Min Liu ◽  
Liang Xiao ◽  
Fuwan Gan ◽  
...  
Keyword(s):  
Uncertainty Analysis ◽  
Return Period ◽  
Flood Control ◽  
Control Design ◽  
Specific Aspect ◽  
Flood Peak ◽  
Multivariate Frequency Analysis ◽  
Study Case ◽  
Best Fit

The conventional flood control design analysis usually focuses on a specific aspect like flood peak discharge or the volume of flood, with the development of technology, hydrological analysis tends to be multi-dimensions research. The multivariate frequency analysis of a flood has been widely investigated, while there is lack of literatures about flood control design under multiple floods. In this study, taking the Guiping Shipping Hub as a study case, a Copula-based approach is proposed to investigate the flood control design under multiple floods, comparison between the proposed method and conventional approach is investigated, the sampling uncertainty is analyzed. The results indicate that (1) the joint distribution of main and tributary floods is modeled by Clayton Copula with PE3 as the best-fit marginal distributions. The proposed Flood Control return period (FC-RP) can describe the different role of main and tributary floods in flood control design. (2) flood combinations uncertainty analysis indicates that the uncertainty of the joint design combinations under the effect of multiple floods decreases with the increase of sample size n, but increases with the increase of the design return period. (3) the 95% confidence interval and standard deviation of the design value of flood control design water level calculated by Flood Control RP is smaller than that of OR RP, which means the Flood Control RP can reduce the uncertainty of flood control design under the condition of multiple floods.

Study on Drag Reduction of Suspended Flow with Extra Fine Sediment

2010 ◽  
Vol 439-440 ◽  
pp. 1567-1571
Author(s):  
Chang Jun Zhu
Keyword(s):  
Drag Reduction ◽  
Water Level ◽  
Flood Control ◽  
Yellow River ◽  
Reduction Rate ◽  
Fine Sediment ◽  
Flood Peak ◽  
The Lower Yellow River ◽  
Abnormal Phenomenon ◽  
Xiaolangdi Reservoir

In view of the abnormal phenomenon that a flood peak increased in August 2004 and July 2005 along the lower Yellow River, the mechanism of this abnormal phenomenon is studied. It is found that the flood increase was due to the decrease the channel roughness in the propagation of high concentrated flood carrying the extra fine sediment which was discharged from xiaolangdi reservoir. In view of this, the equation of drag reduction rate is derivated under variable k pattern, and is applied to the reality. The results show that the equation is reliable and has important role in flood control and calculation in water level with hyperconcentration flow. The study of this paper only is a try and discuusion, and need to be improved.

scholarly journals Model Study on Potential Contributions of the Proposed Huangpu Gate to Flood Control in Taihu Lake Basin

2016 ◽  
Author(s):  
Hanghui Zhang ◽  
Shuguang Liu ◽  
Jianchun Ye ◽  
Pat Yeh
Keyword(s):  
Return Period ◽  
Yangtze River ◽  
Flood Control ◽  
Taihu Lake ◽  
Eastern China ◽  
High Tide ◽  
Lake Basin ◽  
The Yangtze River ◽  
Taihu Lake Basin ◽  
Huangpu River

Abstract. The Taihu Lake basin, one of the most developed and dynamic regions, is located in the hinterland of the Yangtze River Delta, Eastern China. The largest flood in history is the 1999 flood event with a return period of 1 in 200 years, which is above the current capacity of flooding defense in the basin with a return period of 1 in 50 years. Due to its flat saucer-like terrain, the capacity of the flood control system is dependent on the flood defense infrastructure and the peripheral tidal conditions. The Huangpu River, connecting the Taihu Lake and the Yangtze River, is one of the major drains, which is strongly influenced by high tide conditions in the coastal waters of the Yangtze River. Hence, constructing an estuary gate is considered one of the effective solutions to the flooding problem in the basin. This paper aims to quantitatively analyze the potential contributions of the proposed Huangpu gate to flood control capacity of the basin under various flooding scenarios. It is concluded that the Huangpu gate is an effective mean to evacuate the floodwaters, by reducing peak levels in the upper part of the tide-affected river. Its beneficiaries include the Taihu Lake, the related surrounding areas along the Taipu Canal and the Huangpu River basin.

Sewer System for Improving Flood Control in Tokyo: A Step towards a Return Period of 70 Years

1994 ◽  
Vol 29 (1-2) ◽  
pp. 303-310 ◽  
Author(s):  
Kazuyuki Higuchi ◽  
Masahiro Maeda ◽  
Yasuyuki Shintani
Keyword(s):  
Return Period ◽  
Flood Control ◽  
Rainfall Intensity ◽  
Runoff Coefficient ◽  
Large Drop ◽  
Construction Costs ◽  
Sewer System ◽  
Construction Period ◽  
Metropolitan Government ◽  
Under Construction

The Tokyo Metropolitan Government has planned future flood control for a rainfall intensity of 100 mm/hr, which corresponds to a return period of 70 years, and a runoff coefficient of 0.8. Considering that the realization of this plan requires a long construction period and high construction costs, the decision was made to proceed by stages. In the first stage, the improvement of the facilities will be based on a rainfall intensity of 75 mm/hr (presently 50 mm/hr), corresponding to a return period of 17 years, and a runoff coefficient of 0.8. In the next stage the facilities will be improved to accommodate a rainfall intensity of 100 mm/hr. In the Nakano and Suginami regions, which suffer frequently from flooding, the plan of improvement based on a rainfall intensity of 75 mm/hr is being implemented before other areas. This facility will be used as a storage sewer for the time being. The Wada-Yayoi Trunk Sewer, as a project of this plan, will have a diameter of 8 m and a 50 m earth cover. This trunk sewer will be constructed considering several constraints. To resolve these problems, hydraulic experiments as well as an inventory study have been carried out. A large drop shaft for the trunk sewer is under construction.

scholarly journals Hydraulic Evaluation of the Levee System Evolution on the Kurobe Alluvial Fan in the 18th and 19th Centuries

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4406
Author(s):  
Tadaharu Ishikawa ◽  
Hiroshi Senoo
Keyword(s):  
Channel Capacity ◽  
Flood Control ◽  
River Flow ◽  
Global Climate ◽  
Flow Simulation ◽  
Japan Sea ◽  
Main Channel ◽  
Alluvial Fan ◽  
Flood Peak ◽  
Levee System

The development process and flood control effects of the open-levee system, which was constructed from the mid-18th to the mid-19th centuries, on the Kurobe Alluvial Fan—a large alluvial fan located on the Japan Sea Coast of Japan’s main island—was evaluated using numerical flow simulation. The topography for the numerical simulation was determined from an old pictorial map in the 18th century and various maps after the 19th century, and the return period of the flood hydrograph was determined to be 10 years judging from the level of civil engineering of those days. The numerical results suggested the followings: The levees at the first stage were made to block the dominant divergent streams to gather the river flows together efficiently; by the completed open-levee system, excess river flow over the main channel capacity was discharged through upstream levee openings to old stream courses which were used as temporary floodways, and after the flood peak, a part of the flooded water returned to the main channel through the downstream levee openings. It is considered that the ideas of civil engineers of those days to control the floods exceeding river channel capacity, embodied in their levee arrangement, will give us hints on how to control the extraordinary floods that we should face in the near future when the scale of storms will increase due to the global climate change.

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