scholarly journals Study on the Assessment Method of the Impact on Hydrological Safety of Riverside Pit-Ponds along a Dike

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 744
Author(s):  
Shuai Liu ◽  
Dewei Yang ◽  
Jinbao Sheng ◽  
Jiankang Chen ◽  
Chengjun Xu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Flood Control ◽  
River Flow ◽  
Yellow River ◽  
Assessment Method ◽  
Present Condition ◽  
Two Dimensional ◽  
Safety Review ◽  
The Impact ◽  
Hydrological Safety

Riverside pit-ponds are one of the hidden dangers of flood control project safety. At present, the safety evaluation of riverside pit-ponds is limited to the seepage and stable safety review of the dam, and the impact of the pit on the river flow is not considered. In this paper, a two-dimensional mathematical model of flow is established. Pressure correction method is used to solve the pressure-velocity coupling. Topographic cutting method is used to deal with the dynamic boundary problem. The model grid of the pit-ponds area is encrypted. The accuracy of the model in the analysis of river hydrodynamics is verified by an example. The model is applied to the evaluation of the impact of the pit-ponds on river flooding. Taking some riverside pit-ponds of the Yellow River as an example, the river water level, velocity, and flow in the present condition and the backfill condition are simulated by the model. The results show that the existence of these riverside pit-ponds only affects the hydrological features of regions around the pit-ponds, and the impact is too insignificant to threaten the hydrological safety. Through the hydrological safety assessment of the project, it is shown that the combination of the two-dimensional flow mathematical model with seepage, anti-sliding, and seismic safety review can comprehensively assess the hydrological safety of dike engineering.

Study on Grinding Force in Two-Dimensional Ultrasonic Grinding Nano-Ceramics

2010 ◽  
Vol 42 ◽  
pp. 204-208 ◽  
Author(s):  
Xiang Dong Li ◽  
Quan Cai Wang
Keyword(s):  
Mathematical Model ◽  
Ultrasonic Vibration ◽  
Contact Time ◽  
Reaction Force ◽  
Grinding Force ◽  
Two Dimensional ◽  
Indentation Fracture ◽  
Ultrasonic Grinding ◽  
The Impact ◽  
Ultrasonic Vibration Assisted Grinding

In this paper, the characteristic of grinding force in two-dimensional ultrasonic vibration assisted grinding nano-ceramic was studied by experiment based on indentation fracture mechanics, and mathematical model of grinding force was established. The study shows that grinding force mainly result from the impact of the grains on the workpiece in ultrasonic grinding, and the pulse power is much larger than normal grinding force. The ultrasonic vibration frequency is so high and the contact time of grains with the workpiece is so short that the pulse force will be balanced by reaction force from workpiece. In grinding workpiece was loaded by the periodical stress field, which accelerates the fatigue fracture.

scholarly journals Evaluation Study of Kedunglarangan River To Protect Flood In Pasuruan and Sidoarjo

2019 ◽  
Vol 1 (1) ◽  
pp. 55-62
Author(s):  
Ni Nyoman Adum M
Keyword(s):  
Flood Control ◽  
River Flow ◽  
Water Reservoir ◽  
Evaluation Study ◽  
Water Levels ◽  
Work Study ◽  
Flood Prevention ◽  
River Flood ◽  
Excavation Work ◽  
The Impact

Construction of the Kedunglarangan river flood control system designed to prevent flooding every rainy season in the Bangil sub-district. Kedunglarangan River is a river that flows in two regencies Sidoarjo and Pasuruan which has an area of 282.67 km2 watershed with a river length of 23.7 km. Kedunglarangan river has 4 (four) watershed sub-systems. The scope of this flood prevention work-study is the normalization of the Kedunglarangan River starting from the meeting with the Wrati River downstream up to 7 km. Normalization work is carried out with excavation and river widening to meet flood discharge in accordance with the conditions of the study area. If the river excavation work is done in accordance with the design master will form a basin that causes the creation of a dike. In this condition, it will be a temporary water reservoir where the water velocity is very low. So the work carried out the impact is only temporary. From the results of analysts, it is more efficient to do river widening and embankment raising rather than increasing river depth. River excavation work like that is very risky to create very fast sedimentation. Normalization method with river widening is one way to maintain the river flow downstream and flood water levels

scholarly journals Impact of human and environmental interactions on flooding incident in the Jeneberang River South Sulawesi

2021 ◽  
Vol 886 (1) ◽  
pp. 012105
Author(s):  
St. Khadijah Munirah Wahid ◽  
Daud Malalassam ◽  
Roland A. Barkey ◽  
Baharuddin
Keyword(s):  
Flood Control ◽  
River Flow ◽  
Environmental Conservation ◽  
Human Interaction ◽  
Primary Data ◽  
Physical Factors ◽  
Infrastructure Development ◽  
South Sulawesi ◽  
Environmental Interactions ◽  
The Impact

Abstract Human interaction with the environment due to negative impacts. This can be seen, among others, in the interaction of the community with the environment in the Jeneberang watershed area, South Sulawesi Province, which has an impact in the form of flood events. This paper aims to determine the extent of the impact of human and environmental interactions on flooding in the area. The study was carried out through several studies and studies on human interactions and the natural environment in the Jeneberang watershed, literature studies, reviewing and concluding various journals, as well as collecting data through analysis of maps and secondary data from relevant agencies and primary data from the community as the main actors. The results of the study indicate that human interaction with the environment in the Jeneberang watershed has an impact in the form of flooding because the Jeneberang watershed management activities have not been optimally integrated, which are indicated by: 1. Watershed characteristics are not taken into account in infrastructure development. 2. There is still limited understanding of land-use communities about the characteristics of rainfall and surface runoff, as well as their relation to landslides and sedimentation, 3. The influence of mining activities on river flow narrowing and dam silting is not taken into account, and 4. The occurrence of vegetation degradation in downstream. In order to optimize flood control efforts in the Jeneberang river, it is necessary to carry out integrated management of the Jeneberang watershed by integrating all activities in all sectors. Planning for flood control and environmental conservation in general needs to really consider physical factors in the form of climate, hydrology, geology, tectonics, in addition to vegetation, management, technology, and socio-economic and cultural factors. Communities need to be motivated to continue trying to increase their income and welfare, accompanied by efforts to increase understanding and awareness of the importance of maintaining and preserving the environment, through diversifying livelihoods and utilizing natural resources and land that always prioritizes conservation aspects.

scholarly journals TWO-DIMENSIONAL HYDRODYNAMIC MODELLING OF URBAN FLOOD INUNDATION CAUSED BY THE SOUTHWEST MONSOON TO CHARACTERIZE THE IMPACT OF TWENTY-YEAR DIFFERENCE IN LAND USE IN VALENZUELA-OBANDO-MEYCAUAYAN (VOM) USING FLO-2D

2019 ◽  
Vol XLII-4/W19 ◽  
pp. 133-140
Author(s):  
A. C. E. Cruz ◽  
J. M. D. Dizon ◽  
R. B. L. M. Mediavillo ◽  
B. O. Nepomuceno ◽  
A. Cunanan-Yabut ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Flood Control ◽  
Southwest Monsoon ◽  
Hydrodynamic Modelling ◽  
Two Dimensional ◽  
Rapid Urbanization ◽  
Substantial Impact ◽  
Area Of Interest ◽  
The Impact

Abstract. The intensity of urban flooding area due to rapid urbanization in Metro Manila has been worsening over the years caused by the torrential rains brought by the Southwest Monsoon. To further characterize the impact of land use change influenced by urbanization, we compared the flood map generated from two periods (Year 200 & Year 2020) using a two-dimensional hydrodynamic modelling simulated in FLO-2D software. In our simulations, we assigned roughness coefficient values to corresponding land use category derived from an earlier study in the area previously spearhead by JICA in 2001. Each model will incorporate the implemented Year 2000 land use and the projected Year 2010 land use classification respectively, which were used in this earlier study. Meanwhile, both models will use the same sets of parameters for the simulation: IFSAR-derived DEM elevation model and a rainfall event with 10-yr return period. The area of interest of this study is located near Valenzuela-Obando-Meycauayan (VOM) with its boundaries defined from the National Mapping and Resource Information Authority. The flood simulations conducted do not take into consideration in existing flood control measures such as drainage systems and floodwalls to minimize the complexity of the model. The results are evaluated both quantitatively and qualitatively. According to the results, the impact of the land use change on flood formation in most areas are insignificant due to a low degree of land use change. However, there has been substantial impact on flooding in specific areas where there is a major change in the land use. For further studies, we recommend the use of a longer land use change period and the consideration of more varied and precise Manning’s n-values.

scholarly journals Downstream prediction using a nonlinear prediction method

2013 ◽  
Vol 10 (11) ◽  
pp. 14331-14354 ◽  
Author(s):  
N. H. Adenan ◽  
M. S. M. Noorani
Keyword(s):  
Phase Space ◽  
Flood Control ◽  
River Flow ◽  
Linear Prediction ◽  
Prediction Method ◽  
Nonlinear Prediction ◽  
Langat River ◽  
Correlation Dimension Method ◽  
The Impact ◽  
Downstream Area

Abstract. The estimation of river flow is significantly related to the impact of urban hydrology, as this could provide information to solve important problems, such as flooding downstream. The nonlinear prediction method has been employed for analysis of four years of daily river flow data for the Langat River at Kajang, Malaysia, which is located in a downstream area. The nonlinear prediction method involves two steps; namely, the reconstruction of phase space and prediction. The reconstruction of phase space involves reconstruction from a single variable to the m-dimensional phase space in which the dimension m is based on optimal values from two methods: the correlation dimension method (Model I) and false nearest neighbour(s) (Model II). The selection of an appropriate method for selecting a combination of preliminary parameters, such as m, is important to provide an accurate prediction. From our investigation, we gather that via manipulation of the appropriate parameters for the reconstruction of the phase space, Model II provides better prediction results. In particular, we have used Model II together with the local linear prediction method to achieve the prediction results for the downstream area with a high correlation coefficient. In summary, the results show that Langat River in Kajang is chaotic, and, therefore, predictable using the nonlinear prediction method. Thus, the analysis and prediction of river flow in this area can provide river flow information to the proper authorities for the construction of flood control, particularly for the downstream area.

scholarly journals Flood control at km 130 Padaleunyi Toll

2019 ◽  
Vol 270 ◽  
pp. 04013
Author(s):  
Suci Anggraeni ◽  
Arno Adi Kuntoro ◽  
Mohammad Farid ◽  
Dhemi Harlan ◽  
M. Bagus Adityawan
Keyword(s):  
Cross Sections ◽  
Catchment Area ◽  
Flood Control ◽  
River Flow ◽  
Vertical Wall ◽  
Measurement Data ◽  
Road Segment ◽  
Toll Road ◽  
Increased Risk ◽  
The Impact

Flood is one of the natural phenomena that often brings loss of property and life. Mostly, it occurs during a high-intensity rainfall event in the catchment area which results in high river flow that cannot be accommodated by river cross sections. In Bandung area, one of the locations that are often hit by the flood is located on km 130 of the Padaleunyi toll road. This flood occurred due to the overflow of the Cilember and/or Cimancong rivers tributary which flows parallel to the toll road, inundating the toll road segment with low elevation at around km 130+500. This paper aims to analyze the effective flood control methods in the above location. With catchment area around 2.3km2, which is relatively small, peak flood discharge calculation was carried out using a rational method. Hydraulics simulation was carried out using HecRas, based on river field measurement data of Cilember and Cimancong river cross-section. Analysis result shows that the combination between flood embankment construction and river normalization provides a significant decrease in flood water level in km 130 Padaleunyi toll road. The reinforced concrete vertical wall was considered as the appropriate flood protections structure due to the limited space available between the river and the toll road segment. This paper also underlined the impact of the increasing loss of water retention areas on an increased risk of flooding.

Analysis on Backwater Calculation of Ice Jam during Ice-Flood Period

2011 ◽  
Vol 243-249 ◽  
pp. 4458-4461 ◽  
Author(s):  
Jie Shi ◽  
Xiao Lei Zhang ◽  
Feng Ran Zhang
Keyword(s):  
Flood Control ◽  
Yellow River ◽  
Operation Mode ◽  
Natural Phenomenon ◽  
River Ice ◽  
Second Line ◽  
Railway Bridge ◽  
Ice Jam ◽  
Flood Period ◽  
The Impact

The river ice is a commonly natural phenomenon in the cold region. And serious ice situation can cause the ice-flood disaster. So the impact assessment on ice situation is an important factor which need considering in development and utilization of water resources. Based on the backwater calculation of ice jam in ice-flood period, and take the reach near Dazhunzeng Second-line Yellow River Railway Bridge for example, the backwater calculations of ice jam are carried on for the conditions before and after the construction of Dazhunzeng Second-line Yellow River Railway Bridge, and the conclsions are drawn that: (1) the construction of Dazhunzeng Second-line Yellow River Railway Bridge has less influence on the ice-flood control during freezing period; (2) after the construction of Dazhunzeng Second-line Yellow River Railway Bridge, during river-ice breakup the bridge section is combined affected by the old and new bridge, as a result the backwater height before the ice dam of bridge section is about 7.59m, and the ice surface elevation of the bridge section is up to 981.80m; (3) According to the current operation mode of Wanjiazhai Reservoir, the construction of Dazhunzeng Second-line Yellow River Railway Bridge will not have bad impact on the operation of Wanjiazhai Reservoir.

The Impact of Light Polarisation on Light Field of Scenes with Multiple Reflections

2020 ◽  
pp. 108-115 ◽  
Author(s):  
Vladimir P. Budak ◽  
Anton V. Grimaylo
Keyword(s):  
Mathematical Model ◽  
Light Field ◽  
Global Illumination ◽  
Multiple Reflections ◽  
Software Environment ◽  
The Monte Carlo Method ◽  
Mueller Matrices ◽  
Volume Integration ◽  
The Impact

The article describes the role of polarisation in calculation of multiple reflections. A mathematical model of multiple reflections based on the Stokes vector for beam description and Mueller matrices for description of surface properties is presented. On the basis of this model, the global illumination equation is generalised for the polarisation case and is resolved into volume integration. This allows us to obtain an expression for the Monte Carlo method local estimates and to use them for evaluation of light distribution in the scene with consideration of polarisation. The obtained mathematical model was implemented in the software environment using the example of a scene with its surfaces having both diffuse and regular components of reflection. The results presented in the article show that the calculation difference may reach 30 % when polarisation is taken into consideration as compared to standard modelling.

Two Dimensional Unsteady State Mathematical Model for dispersion of Chlorine in Water in a Channel

2011 ◽  
Vol 3 (8) ◽  
pp. 503-505
Author(s):  
Jaipal Jaipal ◽  
◽  
Rakesh Chandra Bhadula ◽  
V. N Kala V. N Kala
Keyword(s):  
Mathematical Model ◽  
Two Dimensional ◽  
Unsteady State
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