scholarly journals Flood threat to the territories below the water dam in conditions of occurrence of extreme hydrological phenomena

2009 ◽  
Vol 41 (1) ◽  
pp. 57-69
Author(s):  
Marek Madeyski ◽  
Bogusław Michalec ◽  
Marek Tarnawski
Keyword(s):  
Water Management ◽  
Water Level ◽  
Channel Capacity ◽  
Water Discharge ◽  
Water Reservoir ◽  
Discharge Flow ◽  
Maximum Water ◽  
The Difference

Flood threat to the territories below the water dam in conditions of occurrence of extreme hydrological phenomena The course of the flood in July 2001 and passage of the freshet wave through the water reservoir Chańcza on the Czarna Staszowska River was analyzed. Culmination of this wave equaling 418.62 m3·s-1 was two times higher than the estimated flow of 1% probability for what the reservoir was designed. Water management during the flood forced a higher than forecast water discharge during culmination. The paper aims at determination of water level situation on the territory at maximum water discharge from the reservoir during the flood equaling 122.75 m3·s-1 and showing possibilities of flood threat reduction. The range of the inundation zone at this discharge flow on the territory below the dam at the length of 3 km was determined taking into regard the influence of vegetation in the valley and in the zone adjacent the channel and bridge. The cause of inundation of the valley on the studied river sector is a rather low channel capacity equaling from 20-60 m3·s-1. It was found that the bridge does not influence the leveling of the analyzed flow and the reserve in the bridge light, determined as the difference of ordinate of the underlay of the span beam and ordinate of the water level under the bridge 0.92 m. Calculations of the channel capacity were also carried out in the case of renovation treatments consisting in removing stiff and soft vegetation and decrease in the inundation range of the valley was demonstrated.

scholarly journals Effect of Water Management Practices on Rice Yield, Water Productivity and Water Savings under Irrigated Rice Paddy Ecosystem

2017 ◽  
Vol 9 (2) ◽  
pp. 79-84 ◽  
Author(s):  
SC Barman ◽  
MA Ali ◽  
HJ Hiya ◽  
KR Sarker ◽  
MA Sattar
Keyword(s):  
Water Management ◽  
Water Level ◽  
Management Practices ◽  
Rice Yield ◽  
Water Productivity ◽  
Ground Level ◽  
Productivity Index ◽  
Water Savings ◽  
Maximum Water ◽  
Irrigation Treatments

A field experiment was carried out during the Boro season 2013 to find out the effects of water management practices on rice yield performance and water productivity index at Old Brahmaputra flood plain paddy land, Muktagacha, Mymensingh. The experiment was laid out in randomized complete block design (RCBD) with six (6) irrigation treatments. Two treatments, T1 and T3 were kept under continuous standing water levels (10 cm and 5 cm respectively) while in treatment T5 irrigation water was supplied for 1st 3 weeks then followed mid season drain out and re-flooded at flowering stage. Three alternate wetting and drying irrigation treatments, T2, T4 and T6 were selected in which irrigation water was applied when water level dropped 20cm, 10cm and 15cm below ground level, respectively. All the irrigation treatments significantly affected the rice yield and yield contributing parameters. The study revealed that the highest grain yield (5950 kg ha-1) was found in treatment T5 which was identical with AWDI treatment T4 (5820 kg ha-1) followed by AWDI treatment T6 (5460 kg ha-1). On the contrary, rice yield of 3350 kg ha-1, 4470 kg ha-1 and 4810 kg ha-1 were found in the treatment T1, T2 and T3, respectively. It was found that AWDI treatment T2 showed maximum water savings (15.1%) followed by T6 (11.3%), T4 (7.59%) and T5 (3.8%), however rice yield in the treatment T2 (4470 kg ha-1) was significantly lower compared to T6, T4 and T5 treatment. Therefore, it may be inferred that treatment T4 (AWDI; irrigation when water level fell 10 cm from ground level), T5 (Irrigation for 1st 3 weeks, then mid-season drain out and re-flooding at flowering) and T6 (AWDI; irrigation when water level fell 15cm from ground level) would be the feasible choice for the water savings, higher rice yield as well as maximum water productivity index (0.478, 0.472 and 0.467, respectively) for sustaining rice farming during the dry Boro season in Bangladesh.J. Environ. Sci. & Natural Resources, 9(2): 79-84 2016

On the Effects of Water Discharge Through Radial Gates at the Caruachi Dam

2010 ◽  
Author(s):  
Douglas Sanchez ◽  
Juan E. Salazar
Keyword(s):  
Water Flow ◽  
Water Discharge ◽  
Three Dimensional ◽  
Flow Induced Vibration ◽  
Discharge Flow ◽  
Cfd Models ◽  
Flow Through ◽  
Critical Velocities ◽  
Flow Effects

This paper presents numerical simulation of the water flow through the radial gates of the 2,280 MW Caruchi Dam, in southern Venezuela, and its relation to the vibration of the dam’s spillways and adjacent Control Building. The study is conducted as a contribution in determining the source of vibration of the fore mentioned structures in the case of gates opening above the normal values of up to 5 m, which occur when a larger water discharge is required in order to maintain an adequate level of the reservoir during the rainy season. The aim of the study was to find the pressure distribution and velocity profiles of the discharge flow through one of the dam’s radial gates and determine critical (reduced) velocities that may result in flow-induced vibration of the gates, as they were deemed to be the source of vibration of the whole set of structures in the first place. For this purpose, a commercially available FEM code was used. Three-dimensional CFD models were developed to simulate behavior of the flow when being released to the spillways, for opening values of 2, 5, 10 and 14 m, including the effect of the spillways’ deflectors. Modal analyses of the gate were performed, to take into account natural vibration frequencies in the determination of its critical velocities. After comparison of the gate’s critical velocities and velocity values from the CFD simulations, it is fair to say that the discharge flow does not directly induce vibration on the gates but rather on the spillways’ structure. This conclusion disregards flow through the gates as triggering the vibration phenomena which gave origin to this project, and puts the emphasis now on studying water flow effects on vibration in the spillway which, if not corrected on time, may ultimately lead to its catastrophic failure.

scholarly journals STUDI EVALUASI DAN PERENCANAAN SISTEM JARINGAN DRAINASE KECAMATAN ROGOJAMPI KABUPATEN BANYUWANGI

2014 ◽  
Vol 12 (1) ◽  
Author(s):  
Muamar Khadafi ◽  
Ernawan Setyono
Keyword(s):  
Cross Section ◽  
Channel Capacity ◽  
Rainy Season ◽  
Water Discharge ◽  
Drainage System ◽  
Storm Water ◽  
Channel Cross Section ◽  
Discharge Flow ◽  
Flood Discharge ◽  
Hydrological Impacts

STUDI EVALUASI DAN PERENCANAAN SISTEM JARINGANDRAINASE KECAMATAN ROGOJAMPI KABUPATENBANYUWANGIMuamar Khadafi1, Ernawan Setyono21&2Jurusan Teknik Sipil Fakultas Teknik – Universitas Muhammadiyah MalangAlamat korespondensi : Jalan Raya Tlogomas 246 Malang 65144ABSTRACTParts of the eastern part of the island of Java there is a district in the district called banyuwangi.The condition of the existing drainage system in the sub-district Rogojampi banyuwangi can say isinadequate to accommodate the construction of both the discharge flow from the waste comesfrom household or storm water discharge exists as hydrological impacts that occur in the regiontersabut. As a result, many districts Rogojampi often encounter serious problems due to standingwater is often the case in several sections of the area especially during the rainy season arrives. Soit is important to evaluate the channel capacity and planning of the new drainage system.Based on the evaluation results can be known that there are several sections of the channelwere not able to hold back the flood discharge stage biennial (two-year Q), so that the necessary replanningthe channel cross section. It provides a new drainage plan is also required to reduce thepool of water when it rains. It also required some supporting buildings culvert drainage system tominimize area genagnanKey Word ; Drainage, Discharge, Normalisation, Planing, Evaluasition

Spawning population characteristics of pike Esox lucius L. in Lake Rubikiai (Lithuania)

2012 ◽  
Vol 7 (5) ◽  
pp. 867-877 ◽  
Author(s):  
Vida Žiliukienė ◽  
Valdemaras Žiliukas
Keyword(s):  
Water Level ◽  
Population Characteristics ◽  
Spawning Period ◽  
Maximum Water Level ◽  
Class Strength ◽  
Maximum Water ◽  
The Mean ◽  
The Difference ◽  
One Year ◽  
Old Females

AbstractThe aim of the study was to describe the peculiarities of pike spawning in mesotrophic Lake Rubikiai, to determine the spawning population structure and evaluate the influence of some environmental factors on year-class strength formation. The data were collected in April and May (1994–2011). A total of 1586 individuals were caught. The age of pike ranged from 1 to 12 years; 2–5-yearold males (96.0%) and 3–8-year-old females (89.1%) prevailed. The overall sex ratio of females to males was 1:4.1. One-year-old spawning males (26.5–28.5 cm) and two-year-old spawning females (31.5–35.5 cm) constituted 2.1% and 2.6%, respectively. Water temperature during the spawning period was relatively stable, between 4 and 6°C, during March and increased slightly towards 10°C in the middle of April. No correlation was observed between female length and spawning date. Year-class strength did not correlate with the last day of ice presence and the minimal water level at the end of spawning (WLmin), but statistically significantly negatively correlated with the maximum water level at the beginning of spawning (WLmax) and the difference between WLmax and WLmin. The mean annual survival rate for pike (aged ≥2) was 0.74 and the mean annual instantaneous mortality rate was 0.45.

scholarly journals Flood Transformation Effect of a System of Small Water Reservoirs

2015 ◽  
Vol 63 (5) ◽  
pp. 1581-1586
Author(s):  
Václav Tlapák ◽  
Petr Pelikán ◽  
Pavla Pilařová
Keyword(s):  
Work Experience ◽  
Water Discharge ◽  
Retention Volume ◽  
Water Reservoir ◽  
Water Reservoirs ◽  
The Czech Republic ◽  
Small Water ◽  
Proper Design ◽  
Retention Volumes

The paper resumes the investigation of transformation of watershed flow off caused by retention volumes of small water reservoirs (SWR) in landscape. Based on our work experience in the field of water reservoir design and research, we know that simple system of even small fishponds disposes of nonnegligible free retention volume. We decided to verify this assumption with aid of exact determination of discharge transformation within the basin containing realized system of small water reservoirs. The input water management data for design of water reservoirs are represented by water discharge in existing stream related to the point of designed SWR. In the Czech Republic, the data are provided by the Czech Hydrometeorological Institute (CHMI), however the data refer to an unaffected discharges, i.e. without consideration of transformation effects of existing small water reservoirs within the basin. Although the total available volume for transformation purposes of investigated SWR system is relatively small, the results show the transformation effect of such reservoirs is not insignificant. Furthermore the transformation effect is raised by proper design and functionality of the whole system of water reservoirs.

scholarly journals Dimensional Analysis of Compound Section in The Regulate Section Channel Model for Maintenance Main Channel

2021 ◽  
Vol 921 (1) ◽  
pp. 012076
Author(s):  
I Rohani ◽  
D Paroka ◽  
M A Thaha ◽  
M P Hatta
Keyword(s):  
Water Level ◽  
Dimensional Analysis ◽  
Channel Model ◽  
Mass Density ◽  
Water Discharge ◽  
Dimensionless Number ◽  
Cross Sectional ◽  
Sediment Flushing ◽  
The Difference ◽  
Compound Section

Abstract A dimensionless number is used to express the relationship between parameters and is used to describe the research results. Commonly used dimensional analysis methods are the Basic Echelon method, the Buckingham method, the Rayleight method, the Stepwise method and the Langhaar method. The compound section in the regulated section channel model aims to make the section convenient to the flow existing discharge at tidal conditions, in sediment flushing. In this study using the Buckingham’s method of dimensional analysis to determine the weight equation for the flushing sediment (w) and the variables that have been scaled on the flume, W = • (B, B*, h, h*, ⊗h, t, V, Q, g, W,)w,)S), where B is the width of the river (cm), B* is the width of the Flushing section (cm), h is the height of the water level (cm), h* is the height of the flushing section (cm), ®h is the difference in water level (cm), t is the tidal time period (s), V is the flow velocity (cm/s), Q is the water discharge (cm3/s), g is the gravity (cm/s2), )S is the mass density of the sediment (gr/cm3), )w is the density of the water mass (gr/cm3). From the analysis results obtained equations = B * B . h * h . Δ h h . v g t . Q g h 2 t . ρ s h 3 . Where w is the weight of the flushing sediment (gr), B * B is the ratio of the design cross-sectional width to the width of the estuary, h * h is the ratio of the flushing cross-sectional height to the water level, Δ h h is the ratio of the height water level to water depth, v g t is the velocity of falling sediment, Q g h 2 t is the discharge of sediment flushing, ρ s h 3 is the hydrostatic pressure.

FRACTIONAL DETERMINATIONS OF URINARY 17-KETOSTEROIDS IN HYPEREMESIS GRAVIDARUM

1962 ◽  
Vol 41 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Pentti A. Järvinen ◽  
Sykkö Pesonen ◽  
Pirkko Väänänen
Keyword(s):  
Hyperemesis Gravidarum ◽  
First Trimester ◽  
Control Group ◽  
Before And After ◽  
Daily Urine ◽  
First Trimester Of Pregnancy ◽  
The Difference

ABSTRACT The fractional determination of 17-ketosteroids in the daily urine was performed in nine cases of hyperemesis gravidarum and in four control cases, in the first trimester of pregnancy both before and after corticotrophin administration. The excretion of total 17-KS is similar in the two groups. Only in the hyperemesis group does the excretion of total 17-KS increase significantly after corticotrophin administration. The fractional determination reveals no difference between the two groups of patients with regard to the values of the fractions U (unidentified 17-KS), A (androsterone) and Rest (11-oxygenated 17-KS). The excretion of dehydroepiandrosterone is significantly higher in the hyperemesis group than in the control group. The excretion of androstanolone seems to be lower in the hyperemesis group than in the control group, but the difference is not statistically significant. The differences in the correlation between dehydroepiandrosterone and androstanolone in the two groups is significant. The high excretion of dehydroepiandrosterone and low excretion of androstanolone in cases of hyperemesis gravidarum is a sign of adrenal dysfunction.

THE SUBJECT FIELD OF INSTITUTIONAL EDUCATION: THE SENSE AND PROSPECTS OF DEVELOPMENT IN UKRAINE

2020 ◽  
pp. 25-38
Author(s):  
Irina Mordous
Keyword(s):  
Decisive Role ◽  
Subject Field ◽  
National Education ◽  
Progressive Development ◽  
Separate Area ◽  
Economic Transformations ◽  
The Difference ◽  
The Individual ◽  
Political Economic

The development of modern civilization attests to its decisive role in the progressive development of institutions. They identified the difference between Western civilization and the rest of the world. Confirmation of the institutional advantages of the West was its early industrialization. The genesis and formation of institutionalism in its ideological and conceptualmethodological orientation occurs as a process alternative to neoclassic in the context of world heterodoxia, which quickly spread in social science. Highlighting institutional education as a separate area of sociocultural activity is determined by the factor of differentiation of institutional theory as a whole. A feature of institutional education is its orientation toward the individual and his/her transformation into a personality. The content of institutional education is revealed through the analysis of the institution, which includes a set of established customs, traditions, ways of thinking, behavioral stereotypes of individuals and social groups. The dynamics of socio-political, economic transformations in Ukraine requires a review of the foundations of national education and determination of the prospects for its development in the 21st century in the context of institutionalism.

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