scholarly journals Water Inrush Hazards in the Chaoyang Tunnel, Guizhou, China: A Preliminary Investigation

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1083 ◽  
Author(s):  
Nan Zhang ◽  
Qian Zheng ◽  
Khalid Elbaz ◽  
Ye-Shuang Xu
Keyword(s):  
Preliminary Investigation ◽  
Water Inrush ◽  
Water System ◽  
Control Measures ◽  
Guizhou Province ◽  
Karst Water ◽  
Geological Condition ◽  
Underground Engineering ◽  
Management Measures ◽  
Self Protection

This paper reports on a water inrush hazard, which occurred during the construction of the Chaoyang tunnel in Libo County, Guizhou Province, China. On 10 June 2018, a continuous water inflow of about 57 thousand m3 of water within 40 min took place at the tunnel excavation face, resulting in three casualties. The objectives of this study are to investigate and discuss the water inrush process of this atypical case. Further, an inclusive description of the implemented emergency responses will be provided. The principal causes of this tunneling incident include the karst geological condition at the construction field, hydraulic conductivity induced by the connection between karst water system and surface water body, and effects of excavation and precipitation. Moreover, based on a preliminary investigation and analysis, three main control measures to overcome similar incidents in the future are proposed: (1) Performing “water inrush risk grading” in areas prone to water inrush; (2) undertaking comprehensive geological forecast for a synthetic analysis; and (3) employing a monitoring system during the construction, and educating workers on self-protection skills. These effective management measures are bound to benefit underground engineering constructions with regard to water inrush risks.

On Karst Water Inrush (Gushing) Geological Environment in Pingyang Tunnel

2014 ◽  
Vol 580-583 ◽  
pp. 1008-1012 ◽  
Author(s):  
Qing Qing Zhu ◽  
Qiang Qiang Miao ◽  
Shu Ping Jiang
Keyword(s):  
Surface Water ◽  
Engineering Geology ◽  
Water Inrush ◽  
Water Environment ◽  
Rock Properties ◽  
Karst Water ◽  
Geological Environment ◽  
Underground Engineering ◽  
Engineering Construction ◽  
Groundwater Environment

According to Pingyang tunnel karst complex groundwater environment ,This paper carried out thorough theoretical analysis and field observation from Pingyang tunnel stratum rock properties, engineering geology, hydrogeology, the surrounding patch, runoff and drainage and the changes of surface water environment, as well as tunnel excavating. The complex formation mechanism has given in the Pingyang tunnel karst water . Some effective references had put forward for the engineering treatment, provided some valuable references for other similar underground engineering construction.

Investigation on emotion and behavior of children aged 1-11 during the pandemic of COVID-19: A Cross-sectional study in Guizhou, China (Preprint)

2020 ◽  
Author(s):  
Yushi Mo ◽  
Yan Luo ◽  
Hong Li ◽  
Dewei Xiao ◽  
Shuqing Liu ◽  
...  
Keyword(s):  
Behavioral Problems ◽  
Prevention And Control ◽  
Online Survey ◽  
Sleep Problems ◽  
Emotional Problems ◽  
Control Measures ◽  
Emotional And Behavioral Problems ◽  
Guizhou Province ◽  
Cross Sectional ◽  
And Control

BACKGROUND In face of the sudden epidemic of COVID-19, strict prevention and control measures had been urgently carried out all over China. Because of the long-term home quarantine, all kinds of people were affected by it. OBJECTIVE In order to understand the mental health of children during the pandemic of COVID-19, this study investigated the prevalence and characteristics of emotional and behavioral problems of children aged 1-11 in Guizhou. METHODS Based on the online survey platform, the survey link was pushed through Wechat in April 2020. Electronic questionnaires were used to investigate children's demographic characteristics, emotional or behavioral problems. RESULTS A total of 3505 valid questionnaires were received from 9 prefectures and cities in Guizhou Province. 39.67% of the children in the 1-2-year-old group had emotional problems. 17.63% of the children agd 3-5 years had behavioral or emotional problems. And 23.57% of the children agd 6-11 years havd behavioral problems. CONCLUSIONS During the home quarantine period of prevention and control of COVID-19, even young children were adversely affected. The prevalence of emotional and behavioral problems in children was high, which was mainly manifested as anxiety, difficulty in concentration and sleep problems.

scholarly journals Seaweed aquaculture: a preliminary assessment of biosecurity measures for controlling the ice-ice syndrome and pest outbreaks of a Kappaphycus farm

2021 ◽  
Author(s):  
Cicilia S. B. Kambey ◽  
Iona Campbell ◽  
Elizabeth J. Cottier-Cook ◽  
Adibi R. M. Nor ◽  
Azhar Kassim ◽  
...  
Keyword(s):  
Hazard Analysis ◽  
Kappaphycus Alvarezii ◽  
Control Point ◽  
Control Measures ◽  
Seaweed Aquaculture ◽  
Critical Control Point ◽  
Management Measures ◽  
Long Line ◽  
Pest Outbreaks ◽  
The Impact

AbstractThe application of biosecurity in seaweed aquaculture plays an important role in reducing the impact of disease and pest outbreaks. The continuous occurrence of seaweed pests including the macroalgal epiphytes, epi-endophytic filamentous algae and biofilms on Kappaphycus farms may also potentially induce further incidences of the ice-ice syndrome. In this study, on-farm biosecurity management measures were tested on the commercially grown seaweeds Kappaphycus malesianus and Kappaphycus alvarezii during peak ice-ice season at Gallam-Gallam Village, Sabah, Malaysia. The investigation was focused on preventative control measures including the early detection of the ice-ice syndrome and pests through propagule health checks, regular cleaning of the crop thallus and associated long-line ropes and monitoring of the environment. Farm procedures and practices were also assessed in terms of their biosecurity ‘risk’ using the hazard analysis and critical control point (HCCAP) approach. Observations were replicated in two different farm management systems; one system adopted routine biosecurity measures and the other had no biosecurity measures. The results showed that the ice-ice syndrome and pest outbreak was significantly decreased by 60–75% for K. malesianus and 29–71% for K. alvarezii at the farm which adopted the routine biosecurity measures compared with the no biosecurity treatment. The biosecurity measures also significantly improved growth rate and seaweed quality. The infection levels of the epi-endophyte Melanothamnus sp. contributed to the ice-ice syndrome in K. malesianus, whilst the epiphyte coverage was correlated to the ice-ice incidence in K. alvarezii. This study provides the first evidence of biosecurity management measures significantly decreasing the incidence of the ice-ice syndrome and pests on a commercial seaweed farm.

Healthcare personnel experiences implementing carbapenem-resistant Enterobacterales infection control measures at a ventilator-capable skilled nursing facility—A qualitative analysis

2021 ◽  
pp. 1-7
Author(s):  
Katharina R. Rynkiewich ◽  
Jinal Makhija ◽  
Mary Carl M. Froilan ◽  
Ellen C. Benson ◽  
Alice Han ◽  
...  
Keyword(s):  
Infection Control ◽  
Multidrug Resistant ◽  
Control Measures ◽  
Healthcare Personnel ◽  
Skilled Nursing ◽  
Infection Control Measures ◽  
Carbapenem Resistant ◽  
Resident Care ◽  
Semistructured Interviews ◽  
Self Protection

Abstract Objective: Ventilator-capable skilled nursing facilities (vSNFs) are critical to the epidemiology and control of antibiotic-resistant organisms. During an infection prevention intervention to control carbapenem-resistant Enterobacterales (CRE), we conducted a qualitative study to characterize vSNF healthcare personnel beliefs and experiences regarding infection control measures. Design: A qualitative study involving semistructured interviews. Setting: One vSNF in the Chicago, Illinois, metropolitan region. Participants: The study included 17 healthcare personnel representing management, nursing, and nursing assistants. Methods: We used face-to-face, semistructured interviews to measure healthcare personnel experiences with infection control measures at the midpoint of a 2-year quality improvement project. Results: Healthcare personnel characterized their facility as a home-like environment, yet they recognized that it is a setting where germs were ‘invisible’ and potentially ‘threatening.’ Healthcare personnel described elaborate self-protection measures to avoid acquisition or transfer of germs to their own household. Healthcare personnel were motivated to implement infection control measures to protect residents, but many identified structural barriers such as understaffing and time constraints, and some reported persistent preference for soap and water. Conclusions: Healthcare personnel in vSNFs, from management to frontline staff, understood germ theory and the significance of multidrug-resistant organism transmission. However, their ability to implement infection control measures was hampered by resource limitations and mixed beliefs regarding the effectiveness of infection control measures. Self-protection from acquiring multidrug-resistant organisms was a strong motivator for healthcare personnel both outside and inside the workplace, and it could explain variation in adherence to infection control measures such as a higher hand hygiene adherence after resident care than before resident care.

Restoration of karst water system in Jinan, China

2015 ◽  
pp. 647-652
Author(s):  
Juan Zhou ◽  
Liting Xing ◽  
Song Wang ◽  
Huibo Zhuang ◽  
Tongwen Dou ◽  
...  
Keyword(s):  
Water System ◽  
Karst Water

Greek Settlements and Karst Phenomena: Corinth and Syracuse

1993 ◽  
Author(s):  
Dora P. Crouch
Keyword(s):  
Water System ◽  
Field Work ◽  
Karst Water ◽  
Ancient Greek ◽  
Greek City ◽  
The Road ◽  
Aegean Islands ◽  
Karst Waters ◽  
The Relationship

To get a sense of the relationship between karst geology and Greek settlement, we will look at examples from the Greek mainland, the islands of the Aegean, and Sicily. There is no attempt here to be comprehensive, as the necessary field work has not been done to make that possible, but rather these examples are selected to suggest the way that karst water potential played an important role in site selection and development. The major examples selected are Athens and Corinth for mainland Greece, Rhodes for the Aegean Islands, Assos and Priene for Ionia, and Syracuse and Akragas for Sicily. Other places will be cited briefly if the details from those sites are particularly illuminating. Karst phenomena, as we have seen, are found throughout the Greek world. Since Athens is perhaps the best documented Greek city, and has in addition a phenomenal karst system as its monumental focus, it receives here a section of its own, Chapter 18, The Well-Watered Acropolis. In Chapter 11, Planning Water Management, we discuss Corinth’s water system in comparison with that of her daughter city Syracuse. Here, however, we will consider the aspects of water at Corinth that derive from the karst geology of the area. This city is an excellent example of the adaptation of urban requirements to karst terrane, the siting of an ancient Greek city to take advantage of this natural resource. Ancient Corinth was built on gradually sloping terraces below the isolated protuberance of Acrocorinth, which acts as a reservoir, with the flow of waters through it resulting in springs (Fig. 8.1). That karst waters are to be found in perched nappes even at high altitudes accounts for the spring of Upper Peirene not far below the summit of Acrocorinth, as well as the two fountains half-way down the road from its citadel, and the fountain called Hadji Mustapha, at the immediate foot of the citadel (as reported by the late seventeenth century traveler, E. Celebi, cited in Mackay, 1967, 193–95.) The aquifers also supply the aqueduct (probably ancient) from Penteskouphia southwest of Acrocorinth.

scholarly journals Evaluating the use and intent of drinking water advisories in Atlantic Canada

Water Policy ◽  
2020 ◽  
Vol 22 (5) ◽  
pp. 908-924
Author(s):  
Kaycie Lane ◽  
Graham Gagnon
Keyword(s):  
Risk Management ◽  
Drinking Water ◽  
Water System ◽  
Water Systems ◽  
Alternative Methods ◽  
Atlantic Canada ◽  
Water Safety ◽  
Proactive Management ◽  
Management Measures ◽  
Over Time

Abstract Drinking water advisories (DWAs) are used as a tool for identifying water safety concerns in many jurisdictions. Evidence from previous research demonstrates a lack of improvement in water system operations over time, with an increase in the total number of DWAs in place. DWAs are predominantly issued due to operational concerns within a water system, implying a lack of proactive management measures for preventable issues. Therefore, DWAs represent a chronic issue for many water systems, particularly those lacking resources to implement operational improvements. This study explores DWA characteristics in Atlantic Canada, including frequency and duration, focusing on municipal and private water systems. Seasonality was identified as a trend in DWA issuance in Nova Scotia, and reasons for DWA issuance are largely unchanged over time. Neither of these identified concerns has led to a change in DWA reporting or issuance procedures. Additionally, this study identifies a lack of a common reporting format, leading to the proposal of a template of minimum characteristics for future DWA reporting. Overall, this study highlights deficiencies in the DWA issuance process as a water safety measure and suggests alternative methods for risk management in water systems to alleviate the persistence and prevalence of DWAs in Canada.

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