Breach of a naturally embanked dam on Yalong River

1992 ◽  
Vol 19 (5) ◽  
pp. 811-818 ◽  
Author(s):  
Y. J. Chen ◽  
F. Zhou ◽  
Y. Feng ◽  
Y. C. Xia
Keyword(s):  
Key Words ◽  
Failure Process ◽  
Landslide Dam ◽  
Sichuan Province ◽  
Dam Breach ◽  
Flood Discharge ◽  
Flood Hydrograph ◽  
The Right ◽  
Yalong River

A huge slide involving 68 × 106 m3 of soils occurred along the right bank of Yalong River in Sichuan Province, China. The sliding materials blocked the river and formed a dam-like structure having a height of 175 m and creating a reservoir with a capacity of approximately 680 × 106 m3. The dam breach which was caused by overtopping lasted 13 h and resulted in an estimated maximum flood discharge of 53 000 m3/s. Based on the hydrograph created by measuring the flows downstream of the dam, the process of dam breach was roughly estimated. Key words: landslide dam, cohesionless material, overtopping, breach, flood, hydrograph, failure process.

Comparison on the failure process and mechanism between a debris flow and a landslide dam

2020 ◽  
Author(s):  
Huayong Chen ◽  
Chunran Cao ◽  
Xiaoqing Chen ◽  
Jiangang Chen
Keyword(s):  
Debris Flow ◽  
Water Content ◽  
Failure Process ◽  
Landslide Dam ◽  
Clay Content ◽  
Peak Discharge ◽  
Initial Water Content ◽  
Dam Breach ◽  
Initial Water ◽  
Landslide Dams

<p>Besides the numerous artificial dams, there are some other kind of dams distribute such as the glacier dams, moraine dams, landslide dams, and the debris flow dams in China. Especially, the landslide dams and debris flow ones widely distribute in southwest of China after the M8.0 Wenchuan earthquake. Much attention has been paid to the formation, stability, breach process, and the peak discharge prediction of a landslide dam. However few achievements are obtained on the debris flow dams even if the failure of a debris flow dam has posed great threat to the property and life of residents downstream. In this paper, based on the main difference between a landslide and debris flow dam, experiments were conducted by considering different clay content, the initial water content, and incoming water flow. It indicated that the failure duration of a debris flow dam was about 1.60 times as long as that than that of a landslide dam. The peak discharge at the debris flow dam breach was 5.38 L/s. However, the peak discharge at the landslide dam was 7.50 L/s, which was 1.39 times as big as that of a debris flow dam. Finally, by modifying the existing critical initialization condition for the landslide dams, the critical initialization condition for a debris flow dam was proposed.</p>

scholarly journals Influence of Internal Structure on Breaking Process of Short-Lived Landslide Dams

2021 ◽  
Vol 9 ◽  
Author(s):  
Chu-Ke Meng ◽  
Kun-Ting Chen ◽  
Zhi-Pan Niu ◽  
Bao-Feng Di ◽  
Yu-Jian Ye
Keyword(s):  
Growth Rate ◽  
Failure Process ◽  
Landslide Dam ◽  
Storage Process ◽  
Dam Breach ◽  
Landslide Dams ◽  
Evolution Characteristics ◽  
Breaking Mechanism ◽  
The Difference ◽  
The Stability

The diversity of the landslide dam structure will result in the difference in the dam body’s seepage. In this paper, based on two kinds of soil bodies of different particle gradations, fourteen groups of structures of the landslide dam are designed to generalize different seepage developments and breaking processes. The study shows that the saturation and seepage evolution characteristics of the landslide dam's seepage have a considerable influence on the landslide dam’s breaking characteristics. An empirical formula is fitted according to the time-seepage degree curve of the landslide dams of different breaking processes to predict the breaking forms of the landslide dams before the dam break. During the water storage process of the landslide dam, the seepage's saturation process inside the dam body reduces the stability of the landslide dam, thus affecting the evolution of the failure process after it has started. In the experiment, it is found that the growth rate of the seepage degree of the landslide dam is inversely proportional to the growth rate of the dam breach area. Although the internal penetration of landslide dams is usually undervalued, the result verifies that the study on the seepage process before the breaking of landslide dam is conductive for further understanding the breaking mechanism of the landslide dam.

scholarly journals Numerical simulation method for predicting a flood hydrograph due to progressive failure of a landslide dam

Landslides ◽  
2021 ◽  
Author(s):  
S. Takayama ◽  
S. Miyata ◽  
M. Fujimoto ◽  
Y. Satofuka
Keyword(s):  
Field Experiments ◽  
Failure Modes ◽  
Initial Conditions ◽  
Progressive Failure ◽  
Landslide Dam ◽  
Failure Model ◽  
Reservoir Water ◽  
Erosion Model ◽  
Flood Hydrograph ◽  
Overtopping Erosion

AbstractReducing the damage due to landslide dam failures requires the prediction of flood hydrographs. Although progressive failure is one of the main failure modes of landslide dams, no prediction method is available. This study develops a method for predicting progressive failure. The proposed method consists of the progressive failure model and overtopping erosion model. The progressive failure model can reproduce the collapse progression from a dam toe to predict the longitudinal dam shape and reservoir water level when the reservoir water overflows. The overtopping erosion model uses these predicted values as the new initial conditions and reproduces the dam erosion processes due to an overtopping flow in order to predict a flood hydrograph after the reservoir water overflows. The progressive failure model includes physical models representing the intermittent collapse of a dam slope, seepage flow in a dam, and surface flow on a dam slope. The intermittent collapse model characterizes the progressive failure model. It considers a stabilization effect whereby collapse deposits support a steep slope. This effect decreases as the collapse deposits are transported downstream. Such a consideration allows the model to express intermittent, not continuous, occurrences of collapses. Field experiments on the progressive failure of a landslide dam were conducted to validate the proposed method. The progressive failure model successfully reproduced the experimental results of the collapse progression from the dam toe. Using the value predicted by the progressive failure model, the overtopping erosion model successfully reproduced the flood hydrograph after the reservoir water started to overflow.

A clinical case of transcleral fixation of an artificial iridochrustalic diaphragm during its decentration in a patient with aniridia and aphakia

2021 ◽  
pp. 206-208
Author(s):  
D.O. Shkvorchenko ◽  
◽  
I.M. Gorshkov ◽  
S.A. Kakunina ◽  
K.S. Norman ◽  
...  
Keyword(s):  
Key Words ◽  
Russian Federation ◽  
Clinical Case ◽  
Functional Results ◽  
Successful Implementation ◽  
Ministry Of Health ◽  
Visual Functions ◽  
The Russian Federation ◽  
The Right

Purpose. To evaluate the clinical and functional results of the technique of transcleral fixation of the artificial iridochrustalic diaphragm during its decentration in a patient with aniridia and aphakia. Material and methods. Under observation was a 32-year-old patient K. with a diagnosis on the right eye: iridochrustalic diaphragm decentralization, posttraumatic aniridia, posttraumatic aphakia, who underwent a method of transcleral fixation of a displaced artificial iridochrustalic diaphragm developed at the Academician S. N. Fedorov Eye Microsurgery of the Moscow Ministry of Health of the Russian Federation. Results. Patient K. is subjectively satisfied with the visual functions obtained in the right eye. Conclusion. Thus, this clinical case demonstrates a very successful implementation of the fixation of the iridochrustalic diaphragm with its displacement to obtain satisfactory visual functions in the patient. Key words: aniridia, iridochrustalic diaphragm, transcleral fixation.

Prophylaxis of obstetric and perinatal pathology at women with pathological increase of body weight during pregnancy

2018 ◽  
pp. 7-79
Author(s):  
S.Yu. Vdovichenko ◽  
◽  
T.D. Fakhrutdinova ◽  
Keyword(s):  
Health Care ◽  
Body Weight ◽  
Pregnant Women ◽  
Key Words ◽  
Perinatal Outcomes ◽  
Perinatal Complications ◽  
Perinatal Pathology ◽  
Fetoplacental Complex ◽  
The Right ◽  
Selection Of

The objective: depression of obstetric and perinatal complications at pregnant women with pathological increase of body weight during pregnancy on the basis of studying of clinical-functional, endocrinologic, metabolic, morphological features of condition of fetoplacental complex and development of advanced algorithm of treatment-and-prophylactic actions. Materials and methods. We conducted examination of 264 patients who consisted on the account concerning pregnancy in female consultations of Kiev. By a method of selection of 178 women were included in retrospective research and 86 – in prospective. The main group was made by 39 pregnant women with whom led individual discussions, control – 142 women, that received traditional references in female consultation. Results. Use of the algorithm improved by us allows to improve obstetric (decrease of frequency of a preeclampsia by 12.3%; anomalies of a patrimonial deyalnost for 8.4%) and perinatal outcomes (depression of level of an asphyxia at a delivery for 9.4% and post-natal adaptation for 7.8%) deliveries of women with an excessive increase of body weight during pregnancy. Conclusion. The received results grant the right to recommend the algorithm improved by us for wide use in practical health care. Key words: obstetric and perinatal pathology, pathological increase of body weight, prophylaxis.

scholarly journals At gøre det rigtige alt for godt – ressourcestærke forældre og undervægt

2013 ◽  
Vol 24 (4) ◽  
pp. 37-63
Author(s):  
Annette Quinto Romani
Keyword(s):  
Higher Education ◽  
Social Inequality ◽  
Key Words ◽  
Health Knowledge ◽  
Sociological Perspective ◽  
The Public ◽  
8Th Grade ◽  
Perceived Weight ◽  
The Right ◽  
Shed Light

Overvægt spiller en stor rolle i den offentlige debat, mens undervægt til dels er et overset problem. Formålet med denne artikel er at belyse undervægt ud fra et sociologisk perspektiv med fokus på individ- og strukturperspektivet. Til at belyse denne problemstilling anvendes data fra Projekt 3A, som omfatter 1.092 skoleelever i Aalborg Kommune. Undersøgelsen blev foretaget i 2008-2011 med dataindsamling i 2008, da eleverne gik i 6. klasse samt i 2010, da eleverne gik i 8. klasse. Resultaterne viste, at piger med højt uddannede mødre havde en større sandsynlighed for at blive undervægtige end piger af lavt uddannede mødre. Endvidere fremgik det, at sandsynligheden for undervægt steg på de skoler, hvor eleverne blev udsat for en intervention, som øger viden om egen sundhed og til dels en intervention, som er rettet mod adfærdsændringer. Det fremgik desuden også, at interventionen, som øger viden om egen sundhed, øgede den sociale ulighed i vægt. ENGELSK ABSTRACT: Annette Quinto Romani: Overdoing the Right Thing – Advantaged Parents and Underweight Overweight is an important topic in the public debate, while underweight is an often ignored problem. The purpose of this article is to shed light on underweight in a sociological perspective focusing on both individual and structural perspectives. To illustrate this I use data from Project 3A, which includes 1.092 schoolchildren in the Municipality of Aalborg. The study was conducted in 2008-2011, where data was collected in 2008 when the schoolchildren attended 6th grade and in 2010 when they attended 8th grade. The results indicate that girls with mothers having a higher education are more likely to be underweight as opposed to girls with lower educated mothers. In addition, the results indicate that the likelihood of underweight to some extend increased among the schoolchildren who were exposed to an intervention that increased their own health knowledge, and to a behavioral altering intervention. Social inequality in weight was increased by the intervention that increases own health knowledge. Key words: Underweight, social inequality, self-perceived weight, issue of elite.

Theoretical basis of research of personal mediation of manipuiative tendencies

2021 ◽  
Vol 2021 (2) ◽  
pp. 25-34
Author(s):  
Yu. V. Borets ◽  
◽  
O. V. Palahniuk ◽  
Keyword(s):  
Theoretical Analysis ◽  
Key Words ◽  
Theoretical Basis ◽  
Scientific Literature ◽  
Use Of Force ◽  
Training Process ◽  
The Will ◽  
The Subject ◽  
The Right ◽  
Practical Implications

The purpose of the article. Theoretical analysis of personal mediation of manipuiative tendencies. Methodology. The basis of this study is a theoretical analysis, synthesis, generalization, systematization of available scientific literature on the subject. Results. Manipulation of consciousness is one of the ways to dominate and suppress the will of people by acting on them through the programming of their behavior. This action is aimed at the mental structures of man, which is carried out secretly and aims to change the thoughts, motivations and goals of people in the right direction for a certain group of people. In this case, the purpose of manipulation – hiding their true intentions, to encourage another person to take certain actions, change values, ideas and opinions, etc., while maintaining the illusion of independence in general and independence of decisions or actions. In other words, to motivate a person to what he does not want to do, to distract from what he aspires to, but at the same time to create in him the confidence that he is acting of his own free will. Practical implications. The need to study manipulative tendencies is to determine the main ways and methods of manipulation and ways to protect against manipulative action. To reveal the main features of the manipulator’s personality and the category of people who are most prone to manipulative action. Theoretical materials can be used in the training process of the courses “Psychology of personality”, “Age Psychology”, “Differential Psychology”, “Fundamentals psychological correction”. Originality/value. It was found that the criteria for manipulation are: the attitude of the manipulator to the objects of manipulation as a means to achieve their own goal, the desire to gain unilateral advantage, the hidden nature of influence, use of force, motivation, motivation and skill in the process of manipulative influence. Key words: manipulation, coercion, manipulation, subject of manipulation, projection, Machiavellianism, manipulative influence.

Comparison of bovine uterine horns for progesterone and oxytocin levels with bilateral corpus luteum

1996 ◽  
Vol 76 (3) ◽  
pp. 463-464 ◽  
Author(s):  
W. A. Cerbito ◽  
M. P. B. Wijayagunawardane ◽  
M. Takagi ◽  
K. Sato ◽  
A. Miyamoto ◽  
...  
Keyword(s):  
Key Words ◽  
Corpus Luteum ◽  
Estrous Cycle ◽  
Luteal Phase ◽  
Uterine Horn ◽  
Corpora Lutea ◽  
Uterine Tissue ◽  
Tissue Samples ◽  
Significant Difference ◽  
The Right

Bovine uterine horns with both ovaries containing a corpus luteum (CL) were compared for progesterone (P4) and oxytocin (OT) concentrations during the luteal phase of the estrous cycle. Uterine tissue samples from five Holstein cows with bilateral CL obtained from the slaughterhouse were used for this study. No significant difference was observed in P4 and OT levels in the right and left horns with corpora lutea in both ovaries. The data clearly indicate that both sides of the uterine horn having a functional CL are exposed to similar levels of P4 and OT, supporting the hypothesis that luteal products are delivered locally to the uterus. Key words: Progesterone, oxytocin, uterine horn, bilateral, corpus luteum, cow

scholarly journals Coupled modelling of flood due to natural landslide dam breach

2012 ◽  
Vol 165 (10) ◽  
pp. 525-542 ◽  
Author(s):  
Wei Huang ◽  
Zhixian Cao ◽  
Zhiyuan Yue ◽  
Gareth Pender ◽  
Jifu Zhou
Keyword(s):  
Landslide Dam ◽  
Dam Breach ◽  
Coupled Modelling
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