EXAMINATION OF COUNTERMEASURES OF INUNDATION DUE TO HEAVY RAIN BY NUMERICAL ANALYSIS AND OBSERVATION OF THE SEWER WATER LEVEL IN KASUGAI CITY

2019 ◽  
Vol 75 (2) ◽  
pp. I_1267-I_1272
Author(s):  
Masataka MURASE ◽  
Makoto TAKEDA ◽  
Takuya YAGAMI ◽  
Toshihiko TAKAHASHI ◽  
Kouhei OYA ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Water Level ◽  
Heavy Rain ◽  
Sewer Water

scholarly journals Analysis of Pore Water Pressure and Piping of Hydraulic Well

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 502
Author(s):  
Jinman Kim ◽  
Heuisoo Han ◽  
Yoonhwa Jin
Keyword(s):  
Numerical Analysis ◽  
Water Level ◽  
Pore Water ◽  
Large Scale ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Hydraulic Gradient ◽  
Water Levels ◽  
Seepage Velocity ◽  
Seepage Analysis

This paper shows the results of a field appliance study of the hydraulic well method to prevent embankment piping, which is proposed by the Japanese Matsuyama River National Highway Office. The large-scale embankment experiment and seepage analysis were conducted to examine the hydraulic well. The experimental procedure is focused on the pore water pressure. The water levels of the hydraulic well were compared with pore water pressure data, which were used to look over the seepage variations. Two different types of large-scale experiments were conducted according to the installation points of hydraulic wells. The seepage velocity results by the experiment were almost similar to those of the analyses. Further, the pore water pressure oriented from the water level variations in the hydraulic well showed similar patterns between the experiment and numerical analysis; however, deeper from the surface, the larger pore water pressure of the numerical analysis was calculated compared to the experimental values. In addition, the piping effect according to the water level and location of the hydraulic well was quantitatively examined for an embankment having a piping guide part. As a result of applying the hydraulic well to the point where piping occurred, the hydraulic well with a 1.0 m water level reduced the seepage velocity by up to 86%. This is because the difference in the water level between the riverside and the protected side is reduced, and it resulted in reducing the seepage pressure. As a result of the theoretical and numerical hydraulic gradient analysis according to the change in the water level of the hydraulic well, the hydraulic gradient decreased linearly according to the water level of the hydraulic well. From the results according to the location of the hydraulic well, installation of it at the point where piping occurred was found to be the most effective. A hydraulic well is a good device for preventing the piping of an embankment if it is installed at the piping point and the proper water level of the hydraulic well is applied.

Water Level Fluctuation in a Northeastern Ontario Peatland

1974 ◽  
Vol 4 (1) ◽  
pp. 76-81 ◽  
Author(s):  
T. S. Dai ◽  
V. F. Haavisto ◽  
J. H. Sparling
Keyword(s):  
Water Level ◽  
Narrow Range ◽  
Black Spruce ◽  
Heavy Rain ◽  
High Water ◽  
Water Levels ◽  
Level Fluctuation ◽  
Local Climate ◽  
Poor Fen ◽  
Run Off

Depths to water level and changes due to local climate were dissimilar in five peatland conditions in northeastern Ontario. The deepest water level and the greatest fluctuations occurred in an ombrotrophic black spruce bog site. The sedge-dominated poor fen site was submerged following every heavy rain. Waterlogged conditions remained within 6 cm of the surface at all times because of the influence by the water level of Dai Lake. The water level of Dai Lake varied within a narrow range because the loss of water was primarily dependent on slow seepage and evaporation. The lagg site was affected by continuous inflow, high water levels, and fast run-off, therefore, a larger fluctuation of water level prevailed at this site.

scholarly journals Assessment of the Upstream Slope Stability of Darbandikhan Rockfill Dam during Drawdown

2021 ◽  
Vol 9 (1) ◽  
pp. 8-15
Author(s):  
Sirwan Gh. Salim ◽  
Krikar M. G. Noori
Keyword(s):  
Steady State ◽  
Numerical Analysis ◽  
Slope Stability ◽  
Water Level ◽  
Factor Of Safety ◽  
Computer Software ◽  
Loading Conditions ◽  
Upstream Slope ◽  
Rockfill Dam ◽  
The Stability

Earth and rockfill dams face a variety of loading conditions during lifetime. One of the most critical loading conditions is the rapid drawdown of water level after steady state conditions. Rapid drawdown may cause instability of upstream slope of the dam. The present work examines the stability of a rockfill dam under different drawdown rates in terms of factor of safety for the upstream slope of the dam. For this purpose, a computer software named GeoStudio 2012 SEEP/W and SLOPE/W has been used for the numerical analysis. The results showed that the drawdown rate has a significant effect on stability of rockfill dam in which increasing the drawdown rate from 1 m/day to 10 m/day decreases the stability of the dam by 33%. Based on the outcomes, for the studied case the drawdown rate (1 m/day) can be recommended.

Numerical Analysis for Liquefaction Deformation of Low Embankment on Soft Foundation Based on Water Level Changes in Coastal Highway

2019 ◽  
Vol 94 (sp1) ◽  
pp. 321
Author(s):  
Xingui Zhang ◽  
Jiaxiong Zhu ◽  
Yi Zeng ◽  
Peng Jiang ◽  
Nianping Yi ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Water Level ◽  
Water Level Changes ◽  
Soft Foundation

Compounding Effects of Riverine and Coastal Floods and Its Implications for Coastal Urban Flood Resilience

2020 ◽  
Author(s):  
Poulomi Ganguli ◽  
Bruno Merz
Keyword(s):  
Water Level ◽  
Coastal Water ◽  
Flood Hazard ◽  
Storm Surges ◽  
Heavy Rain ◽  
Weather Conditions ◽  
Positive Dependence ◽  
Urban Flood ◽  
River Floods ◽  
Coastal Water Level

<p>Globally more than 600 million people reside in the low elevation (< 10 meters elevation) coastal zone. The densely populated low-lying deltas are vulnerable to flooding primarily in two ways: (1) Due to extreme coastal water level (ECWL) because of either storm surges or heavy rain-induced river floods generated by a severe storm episode. (2) Co-occurrence or successive occurrence of ECWL and river floods as a result of storm-producing synoptic weather conditions leading to compound floods that causes a severe impact than when each of these extremes occurs in an isolation at different times. Most of the earlier assessments that analyzed compound floods, often do not consider the delay between rainfall and streamflow events. River runoff, which also includes subsurface groundwater recharge component, cannot be adequately described by extreme precipitation alone. While most of the literature is limited to analyzing joint dependence between variables considering only central dependence, challenges to flood hazard assessment include difficulty in delineating the severity of riverine floods, especially due to long upper tails of the variables that influence interdependencies between underlying drivers. Despite uncertainties, utilizing the rich database of northwestern Europe, here we assess compound flood severity and its trend by examining spatial interdependencies between annual maxima coastal water level (as an indicator of ECWL) and d-day lagged peak discharge within ±7 days of the occurrence of the ECWL event. Our analysis reveals a spatially coherent dependence pattern with strong positive dependence for gauges located between 52° and 60°N latitude, whereas a weak positive dependence across gauges in > 60°N latitude. Based on a newly proposed index, Compound Hazard Ratio (CHR) that compares the severity of compound floods with at-site design floods, our proof-of-principal analysis suggests nearly half of the stream gauges show amplifications in fluvial flood hazard during 2013/2014’s catastrophic winter storm Xaver that affected most of northern Europe. Furthermore, a multi-decadal (1889 – 2014) temporal evolution of compound flood reveals the existence of a flood-rich period between 1960s and 1980s, especially for the mid-latitude gauges (located within 47° to 60°N), which might be closely linked to the North Atlantic Oscillation (NAO) teleconnection pattern prevailing in the region. On the other hand, gauges at high-latitude (> 60°N) show decreasing to no trend in compound floods. The approach presented here can serve as a basis for developing coastal urban flood risk management portfolios aiding improved resilience and reduce vulnerability in the affected areas.  </p>

scholarly journals LANDSLIDE IN NACHTERSTEDT OF GERMANY

2017 ◽  
Vol 43 (3) ◽  
pp. 1267 ◽  
Author(s):  
E. Moraiti ◽  
B. Christaras ◽  
R. Brauer
Keyword(s):  
Water Level ◽  
Coal Mine ◽  
Groundwater Level ◽  
Heavy Rain ◽  
Underground Coal Mine ◽  
North East ◽  
Recreation Area ◽  
The City

On July 18, 2009, an important landslide occurred in Nachterstedt City toward to the artificial Concordia Lake, which was created, in 1994, at the place of an old coal mine, at the edge of the city. The area is located to North-East of Harz, between the cities of Aschersleben and Quedlingburg. An underground coal mine is responsible for this damage which caused the damage of a privet house and a big building. Three people were also died. The mine apparently closed in 1991 whereupon it was converted into a recreation area. The landslide was caused by the increase of the groundwater level, in the coal mine, after a heavy rain, in relation to the water level of the lake.

Sign in / Sign up

Export Citation Format

Share Document