scholarly journals Debris Flow Generation Based on Critical Discharge: A Case Study of Xiongmao Catchment, Southwestern China

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 552 ◽  
Author(s):  
Lingfeng Gong ◽  
Chuan Tang ◽  
Jiang Xiong ◽  
Ning Li
Keyword(s):  
Debris Flow ◽  
Solid Particles ◽  
Rainfall Pattern ◽  
K Value ◽  
Rainfall Characteristics ◽  
Rainfall Frequency ◽  
Critical Discharge ◽  
Key Factor ◽  
Discharge Parameters ◽  
Using Data

Generation of debris flows is related to poorly sorted mixtures of soil, catchment topography, and rainfall characteristics. Runoff in a valley resulting from intensive rainfall can induce sediment movement within stream beds or along adjacent banks. The water flow in channels is affected by rainfall parameters such as duration, intensity, cumulative rainfall, etc., and is the key factor in debris movement. In this paper, the rainfall characteristics and occurrence conditions of debris flow in Xiongmao Gully on 26 July 2016 were explored. Using data from field surveys and indoor simulation experiments, evaluations of critical discharge parameters for debris movement were performed. Furthermore, debris distribution and the critical discharge characteristics were analyzed via investigation of the catchment topography and cause of the debris flow, and analysis was made of the critical discharge parameters initiating channel debris movement. A K-value clustering analysis method was applied to characterize the rainfall pattern of the study area and its effects on calculation of debris flow. The results showed that for the debris flow in Xiongmao Gully, the debris initiation in the middle reaches of the gully provided the majority of solid particles for the disaster on 26 July 2016, and the upstream confluent provided catchment. Based on the relationship determined by laboratory tests, the calculated critical discharge was 43.8 m3/s, less than the peak discharge (Qc = 66.7 m3/s) calculated by morphological method. In addition, it was indicated that the dominant rainfall patterns of the studied area were first-quartile and second-quartile, i.e., the rainfall occurred primarily at the early or middle stage of this rainfall event. The critical discharge for the debris flow on 26 July was achieved at 5% rainfall frequency, and the larger runoff volume was generated from a short heavy rainfall. According to specific catchment characteristics, such as distributed hydrological analysis, critical discharge, and rainfall pattern of debris flow, forewarning of a damaging debris flow could be made more effective.

scholarly journals Debris Flow Generation Based on Critical Discharge: A Case Study of Xiongmao Catchment, Southwestern China

2020 ◽  
Author(s):  
Lingfeng Gong ◽  
Chuan Tang ◽  
Jiang Xiong ◽  
Ning Li
Keyword(s):  
Debris Flow ◽  
Flow Analysis ◽  
Solid Particles ◽  
Rainfall Pattern ◽  
K Value ◽  
Rainfall Frequency ◽  
Critical Discharge ◽  
Key Factor ◽  
Discharge Parameters ◽  
Rainfall Patterns

A debris flows generation related to a poorly sorted mixture of soil, catchment topography and rainfall characteristic. Runoff of some depth on valley resulting from intensive rainfall can incur the sediments movement of beds or adjacent banks. The fluid flow in channel affected by rainfall parameters combinations, such as duration, intensity, cumulative rainfall, etc., is the key factor for debris movement. In this paper, the rainfall characteristics and occurrence conditions of debris flow in Xiongmao gully on July, 26th, 2016, have been explored, combined with field survey and indoor simulation experiment on the collected critical discharge parameters of debris movement. Further, debris distribution and the critical discharge characteristics have been analysed, by means of investigation on the catchment topography and occurrence cause of the debris flow, analysis of the critical discharge parameters on which the channel debris began to move, and K value clustering analysis method to characterize the rainfall pattern of the studied area, the discharge calculation of debris flow occurring in different rainfall patterns. The results have shown that, for the debris flow occurrence in Xiongmao gully, the debris initiation on the middle reaches of the gully provide the majority of solid particles for the disaster on July, 26th, 2016, and the upstream confluent provided catchment. Based on the relationship obtained from laboratory test, in which the calculated critical discharge was 43.8m3/s, less than the peak discharge (Qc =66.7m3/s), calculated by morphological method. In addition, it has been indicated that the dominated rainfall patterns of the studied area are first-quartile and second-quartile, that is, the rainfall is primarily at earlier or middle to preliminary stage of this time rainfall event. The critical discharge for the occurrence of debris flow on July, 26th was achieved 20a rainfall frequency, the larger runoff volume generated on shorten heavily rainfall. Based on individuality characteristics, such as distributed hydrological analysis, critical discharge and rainfall pattern of debris flow, the forewarning could be more efficient.

scholarly journals Health and Housing Energy Expenditures: A Two-Part Model Approach

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 943
Author(s):  
Fátima Lima ◽  
Paula Ferreira ◽  
Vítor Leal
Keyword(s):  
Low Income ◽  
Health Expenditures ◽  
Household Level ◽  
Energy Expenditures ◽  
Health And Wellbeing ◽  
Health Gains ◽  
Key Factor ◽  
Using Data ◽  
Part Model ◽  
Model Approach

Interest in the interaction between energy and health within the built environment has been increasing in recent years, in the context of sustainable development. However, in order to promote health and wellbeing across all ages it is necessary to have a better understanding of the association between health and energy at household level. This study contributes to this debate by addressing the case of Portugal using data from the Household Budget Survey (HBS) microdata database. A two-part model is applied to estimate health expenditures based on energy-related expenditures, as well as socioeconomic variables. Additional statistical methods are used to enhance the perception of relevant predictors for health expenditures. Our findings suggest that given the high significance and coefficient value, energy expenditure is a relevant explanatory variable for health expenditures. This result is further validated by a dominance analysis ranking. Moreover, the results show that health gains and medical cost reductions can be a key factor to consider on the assessment of the economic viability of energy efficiency projects in buildings. This is particularly relevant for the older and low-income segments of the population.

scholarly journals Determinants of Corporate Anti-Corruption Disclosure: The Case of the Emerging Economics

2021 ◽  
Vol 13 (6) ◽  
pp. 3462
Author(s):  
Maider Aldaz Odriozola ◽  
Igor Álvarez Etxeberria
Keyword(s):  
Empirical Studies ◽  
Geographical Area ◽  
Control Variable ◽  
Emerging Countries ◽  
Point Of View ◽  
Press Freedom ◽  
Negative Effects ◽  
Key Factor ◽  
Using Data ◽  
Positive Effect

Corruption is a key factor that affects countries’ development, with emerging countries being a geographical area in which it tends to generate greater negative effects. However, few empirical studies analyze corruption from the point of view of disclosure by companies in this relevant geographical area. Based on a regression analysis using data from the 96 large companies from 15 emerging countries included in the 2016 International Transparency Report, this paper seeks to understand what determinants affect such disclosure. In that context, this paper provides empirical evidence to understand the factors that influence reporting on anti-corruption mechanisms in an area of high economic importance that has been little studied to date, pointing to the positive effect of press freedom in a country where the company is located and with the industry being the unique control variable that strengthens this relationship.

scholarly journals Farm practices as they affect NH3 emissions from beef cattle

2012 ◽  
Vol 92 (4) ◽  
pp. 525-543 ◽  
Author(s):  
S. C. Sheppard ◽  
S. Bittman
Keyword(s):  
Beef Cattle ◽  
Best Management Practices ◽  
Management Practices ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Total Biomass ◽  
The West ◽  
Finishing Cattle ◽  
Key Factor ◽  
Using Data

Sheppard, S. C. and Bittman, S. 2012. Farm practices as they affect NH 3 emissions from beef cattle. Can. J. Anim. Sci. 92: 525–543. Beef cattle farms in Canada are very diverse, both in size and management. Because the total biomass of beef cattle in Canada is larger than any other livestock sector, beef also has the potential for the largest environmental impact. In this study we estimate NH3 emissions associated with beef cattle production across Canada using data on farm practices obtained from a detailed survey answered by 1380 beef farmers in 11 Ecoregions. The farms were various combinations of cow/calf, backgrounding and finishing operations. The proportion of animals on pasture varied markedly among Ecoregions, especially for cows and calves, and this markedly affected the estimated NH3 emissions. The crop components of feed also varied among Ecoregions, but the resulting crude protein concentrations were quite consistent for both backgrounding and finishing cattle. Manure was stored longer in the west than in the east, and fall spreading of manure was notably more common in the west, especially when spread on tilled land. The estimated NH3 emissions per animal were relatively consistent across Ecoregions for confinement production, but because the proportion of animals on pasture varied with Ecoregion, so did the overall estimated NH3 emissions per animal. Temperature is a key factor causing Ecoregion differences, although husbandry and manure management practices are also important. Hypothetical best management practices had little ability to reduce overall emission estimates, and could not be implemented without detailed cost/benefit analysis.

Research on Motion Characteristics and Formation Mechanism of Debris Flow

2014 ◽  
Vol 711 ◽  
pp. 388-391
Author(s):  
Ji Wei Xu ◽  
Ming Dong Zhang ◽  
Mao Sheng Zhang
Keyword(s):  
Debris Flow ◽  
Formation Mechanism ◽  
Debris Flows ◽  
Catchment Area ◽  
Large Scale ◽  
Large Range ◽  
Extreme Rainfall ◽  
Small Catchment ◽  
Rainfall Characteristics ◽  
Motion Characteristics

On July 9 2013, debris flows occurred around Longchi town with large scale and wide harm, which was a great threat to people's life and property as well as reconstruction work. Debris flow ditch in the surrounding town was studied. This paper focused on loose materials, topography and rainfall characteristics, and explored the formation mechanism of debris flow in Longchi town. The result shows that: a small catchment area in valleys also have the risk of large range of accumulation of debris flow, the debris flow is caused by a lot of loose materials in mountains after earthquake and extreme rainfall. Research results contribute to a better understanding of trigger condition of debris flow after earthquake.

The effects of rainfall regimes and rainfall characteristics on peak discharge in a small debris flow-prone catchment

2019 ◽  
Vol 16 (7) ◽  
pp. 1646-1660 ◽  
Author(s):  
Zhen-lei Wei ◽  
Hong-yue Sun ◽  
Hao-di Xu ◽  
Gang Wu ◽  
Wei Xie
Keyword(s):  
Debris Flow ◽  
Peak Discharge ◽  
Rainfall Characteristics ◽  
Rainfall Regimes

scholarly journals Debris-flow volume quantile prediction from catchment morphometry

Geology ◽  
2019 ◽  
Vol 47 (8) ◽  
pp. 791-794 ◽  
Author(s):  
Tjalling de Haas ◽  
Alexander L. Densmore
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Volume Estimation ◽  
Catchment Characteristics ◽  
Reconstructed Volume ◽  
Elevation Data ◽  
Key Factor ◽  
Watershed Boundary ◽  
Catchment Morphometry ◽  
Frequency Curves

Abstract Estimation of the volumes of potential future debris flows is a key factor in hazard assessment and mitigation. Worldwide, however, there are few catchments for which detailed volume-frequency information is available. We (1) reconstructed volume-frequency curves for 10 debris-flow catchments in Saline Valley, California (USA), from a large number of well-preserved, unmodified surficial flow deposits, and (2) assessed the correlations between lobe-volume quantiles and a set of morphometric catchment characteristics. We found statistically significant correlations between lobe-volume quantiles, including median and maximum, and catchment relief, length (planimetric distance from the fan apex to the most distant point along the watershed boundary), perimeter, and Melton ratio (relief divided by the square root of catchment area). These findings show that it may be possible to roughly estimate debris-flow lobe-volume quantiles from basic catchment characteristics that can be obtained from globally available elevation data. This may assist in design-volume estimation for debris-flow catchments where past flow volumes are otherwise unknown.

Parental education and child mortality in Burundi

1991 ◽  
Vol 23 (3) ◽  
pp. 255-262 ◽  
Author(s):  
Josephine O'Toole ◽  
Robert E. Wright
Keyword(s):  
Child Mortality ◽  
Health Survey ◽  
Parental Education ◽  
Maternal Education ◽  
Proportional Hazards ◽  
Demographic And Health Survey ◽  
Proportional Hazards Models ◽  
Key Factor ◽  
Using Data ◽  
The Relationship

SummaryThis paper examines the relationship between parental education and child mortality in Burundi using data collected in the 1987 Demographic and Health Survey. Proportional hazards models are estimated to examine this relationship, while holding constant other known child mortality determinants. Parental education proves to be a key factor in explaining differences in child mortality, the effect of maternal education being particularly strong compared to paternal education.

Addressing the EMS workforce shortage: How medical students can help bridge the gap

2019 ◽  
Vol 17 (5) ◽  
pp. 380-384
Author(s):  
Nishant Uppal, BS ◽  
Suhas Gondi, BA
Keyword(s):  
Medical Students ◽  
Emergency Medical Services ◽  
Clinical Experience ◽  
Medical Schools ◽  
Emergency Medical Technician ◽  
Road Map ◽  
Emergency Medical ◽  
Key Factor ◽  
Using Data ◽  
Medical Technician

The authors propose that, through innovative and mutually beneficial partnerships between medical schools and local Emergency Medical Services (EMS) agencies, medical students can help mitigate EMS shortages in areas across the country. These partnerships, which we have seen very early signs of in some places, would create channels by which medical students get their emergency medical technician certifications in the summer before matriculating and volunteer with the agency’s ambulance service, either as an extracurricular clinical experience (which are very popular among medical students) or as a way to fulfill clinical or service requirements or earn elective credit. In the attached piece, the authors (1) establish, using data, that a key factor contributing to current and impending EMS shortages is a lack of certified personnel, and (2) propose why and how medical students could provide a novel source of additional volunteers for understaffed public ambulance services, explore some of the benefits and limitations of this proposal, and provide a road-map for how to form partnerships between medical schools and local EMS agencies.

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