Survey Points Research Articles

코로나19 전후 중장년의 우울 변화 궤적 분석: 근로 여부와 가족 형태에 따른 차이를 중심으로

Objectives The purpose of this study was to compare the differences in changes by examining the trajectory of depression level changes in middle-aged before and after COVID-19 and to explore variables that can explain this difference. Methods In this study, a total of 4,368 people aged 40 to 69 years old were analyzed as potential growth models using data from five time points of the Korean Welfare Panel Survey 13th (2018) to 17th (2022). In addition, gen der, work status, education level, marital status, and household type were examined as variables that can explain the trajectory of depression change. Results First, from 2018 to 2022, the level of depression in the middle-aged decreased before COVID-19 but in creased after COVID-19. Second, as a result of analyzing the factors affecting the level of depression in the mid dle-aged in 2018, which is the initial stage of depression, showed that women were higher than men, people with low educational standards were lower than those with high levels, and people with spouses were higher than those without spouses. Conclusions As a result of analyzing the rate of change in depression among middle-aged, marital status and household type, which were variables that did not affect changes in depression among middle-aged before COVID-19, were confirmed to be significant variables explaining changes in depression among middle-aged and older adults after COVID-19.

Rock cairn and items from ‘Operation Windmill’ (January 1948) rediscovered in Bunger Hills, East Antarctica

Abstract A rock cairn, with two matchbooks buried beneath, was found on the summit of the highest hill on Thomas Island, Bunger Hills, East Antarctica. The matchbooks are most likely from United States World War II-era ration packs, which were distributed to various military and civilian expeditions from the mid-1940s into the 1950s. Bunger Hills was first visited by United States Navy ‘Operation Highjump’ in February 1947, when a seaplane most likely landed on a marine inlet, rather than a lake as reported previously. Thomas Island was first visited by United States Navy ‘Operation Windmill’ in January 1948, when a survey point was established, and it is probably this location that is marked by the rock cairn. The matchbooks were replaced beneath the cairn and the rocks replaced. Just over 76 years had elapsed between burial of the matchbooks, construction of the cairn and their rediscovery.

Определение геометрических параметров путей мостовых кранов промышленных предприятий координатным методом

The article deals with the requirements of regulatory documents as to tolerances for the overhead crane’s rail tracks position. The current federal standards and rules Safety Rules for Hazardous Industrial Facilities Using Lifting Structures do not provide for tolerances of the straight track, although excessive curvature of the rail can lead to the crane’s wheels and guides abrasion, and problems with its free movement. The author considers the features of the coordinate method at surveying an overhead crane way of 343 m long. The advantage of the chosen technique is that it simultaneously obtains data on the planned and elevated position of the rails and under-crane structures. The algorithm for processing the survey results in Microsoft Excel software is given. It is proposed to construct an approximating straight line based on the survey points, relative to which the straightness of the rail is controlled. Using this technology enables abandoning alignment measurements, and substitute geometric leveling for trigonometric one. With that method, it is possible to speed up the process of controlling the crane track’s geometry

APPLICATION OF PHOTOGRAMMETRY IN REVERSE ENGINEERING OF MACHINE-BUILDING FACILITIES

To recreate an object in the form of a virtual model based on an existing physical detail, the paper proposes to use the Autodesk ReCap Photo cloud service. Using this service, it is possible to create virtual three-dimensional models by laser scanning a real object or using a digital camera and subsequent digital reproduction of this object in digital space. However, the widespread use of laser scanners and software is very limited due to their high cost. The paper proposes a cheaper, more accessible and no less accurate method that is easy to apply in practice - the method of digital reverse engineering photogrammetry. The method is based on creating a three-dimensional model from two-dimensional photographs using the proposed software. With its help, the user uploads a set of photos to Autodesk's servers and receives a triangulated model of the object with all real dimensions and high quality textures. The data obtained was subsequently imported for further processing into another program of this family, the Autodesk Inventor package. The Autodesk Inventor package has a user-friendly interface and a large set of tools for modeling engineering products. To demonstrate the scale and level of sophistication of ReCap Photo, we demonstrate the options included in the application: first of all, the application supports almost all laser scan file formats. In addition, point clouds can be edited arbitrarily - deleted, copied, highlighted, or even added survey points. As a result, it is possible not only to create technical documentation, but also to reconstruct objects with millimeter accuracy. Visualization and design make it possible to eliminate possible errors. It has been demonstrated that such models can be used to design and obtain working documentation. Due to the identity of the spatial virtual model and the real physical object, the accuracy and quality of design is improved. Thus, it is clearly shown that the presented methodology significantly reduces labor intensity and increases efficiency.

Fish Diversity of East Sea Streams in Han River Region

Fish surveys were conducted near artificial structures installed in nine streams flowing from the Han River region to the east coast of Korea. As a result of the survey, a total of 33,488 individuals belonging to 11 orders, 16 families, and 48 species were found. The dominant and subdominant species were <i>Zacco koreanus</i>, and <i>Zacco platypus</i> respectively. Among the surveyed fish species, endangered species (rank II) were <i>Pungitius sinensis</i>, <i>Ladislavia taczanowskii</i>, <i>Phoxinus phoxinus</i>, <i>Lethenteron japonicus</i> and <i>Cottus hangiongensis</i>. In addition, migratory fish species were <i>Pungitius sinensis</i>, <i>Gymnogobius urotaenia</i>, <i>Tribolodon brandti</i>, <i>Oncorhynchus masou masou</i>, <i>Oncorhynchus keta</i>, <i>Plecoglossus altivelis</i>, <i>Lethenteron japonicus</i>, <i>Cottus hangiongensis</i> and <i>Tribolodon hakonensis</i>. As a result of community analysis, Samcheokosip Stream, and Yangyangnamdae Stream have the highest diversity, and dominance indices respectively. Also, Jusu Stream has the highest richness and evenness indices. The highest number of species was surveyed in Gangneungnamdae Stream (24 species). Alpha diversity (the number of species at each survey point in each stream) was the highest at a survey point in Gangneungnamdae Stream (21 species), and beta diversity (species at each stream survey point that does not overlap with nearby survey point) was the highest at survey points in Gangneungnamdae Stream and Jusu Stream (10 species). As a result of the similarity analysis, surveyed streams were divided into five groups: group 1 stream (Yeongok· Samcheokosip·Gagok), group 2 stream (Yangyangnamdae·Hosan), group 3 stream (Gangneungnamdae), group 4 stream (Sangun·Jusu), and group 5 stream (Nakpung). This study is expected to serve as basic data for managing the aquatic ecosystem of streams flowing from the Han River region to the east coast.

Perceptions of clothing and physical appearance among young men and women from Split

Aim: To assess whether young people are influenced by social and fashion trends related to body, physical appear-ance, and clothing, as well as to explore their understanding of fashion, styles, and trends.Methods: We used a mixed methods approach consisting of both quantitative and qualitative research methods. The first phase of the study included a survey among a conve-nience sample of 200 young men and women from Split. The second phase consisted of semi-structured interviews with nine young women.Results: Most participants considered their physical appear-ance to be average (77.5%). More than half were satisfied with their physical appearance (59.5%), while women tend-ed to be more preoccupied with their body, appearance, and beauty. Participants mostly prioritized the quality of their garments (77%), minimalism (69%), and their personal style (86%) rather than eye-catching cuts or statement pieces. The majority of participants stated that what they wear is not lim-ited by the opinions of society, as well as that they do not place importance on other people’s opinions (72.5%). The analysis of semi-structured interviews showed that female interview-ees follow fashion trends and consider them an indispens-able part of their lives. They mostly follow fashion through social media, namely because they want to follow trends, wear beautiful clothes, and improve the way they present themselves. They associate trends with transience and fitting the mold, whereas they consider style to be an expression of one’s personality. Regarding their clothing, they are focused on quality, functionality, and the feel of the materials on their body, and they support the concept of ‘slow fashion’.Conclusions: The results from our survey point to the impor-tance of personal style and the quality of garments, while the interviews build on these findings, as female interview-ees further emphasized the importance of garment func-tionality and quality. They also state that they are mindful when choosing materials, as well as that they are interested in the concept of sustainable fashion. Although young peo-ple follow fashion and fashion trends, their limiting influ-ence in their own clothing is not overemphasized.

OCCURRENCE OF ALKALINE WATERS IN THE SOUTHERN APUSENI MOUNTAINS (ROMANIA) – RESULTS OF A PRELIMINARY SURVEY

Consumption of alkaline water by the general population has increased over the past two decades, as certain customers value this type of water for its presumed ability to promote health. In spite of the commercial interest for natural alkaline water sources suitable for drinking purposes, relatively few scientific publications related to the occurrence of these waters are available. This article presents the results of a preliminary survey for alkaline water in the Southern Apuseni Mountains. This region has been selected as study area due to the presence of limestones and ophiolitic rocks, very often in contact with each other, both having the potential to bring the pH of natural waters to the alkaline range. A total of 78 sampling points, represented by streams, lakes, springs and dug wells have been investigated, and the physico-chemical common parameters were measured in the field. Alkaline water with pH above 8.0 has been found in almost 29 sampling points, out of which 7 points had a pH above 8.5. Most of the points were represented by surface running water. The prospective areas, as identified by this survey, correspond to Trascau Mts., and to the western (predominantly ophiolitic) part of the Metaliferi Mts. The data included in this paper may represent the starting point for a systematic survey and for a detailed study of the potential alkaline water resources in the study area.

The Reciprocal Effects of Prosociality, Peer Support and Psychological Well-Being in Adolescence: A Four-Wave Longitudinal Study.

The aim of this study was to analyze the reciprocal effects between prosociality, peer support and psychological well-being using a four-wave longitudinal study and a within-person analytical approach (random intercept cross-lagged panel model, RI-CLPM). A sample of 587 adolescents (males = 308; Mage = 14.23, SD = 0.58) enrolled in the first year of high school (9th grade) were recruited and followed over four years from 2016 (Time 1 [T1]) to 2019 (Time 4 [T4]). Once a year, they filled in a questionnaire measuring prosociality, peer support, and psychological well-being. The results from the RI-CLPM revealed that, at the between-person level, prosociality, peer support and psychological well-being were all positively associated. Conversely, at the within-person level and at all survey points, only psychological well-being positively predicted prosociality one year later. Specifically, we found that adolescents with higher levels of psychological well-being were more likely to show a tendency for prosocial behaviors over time. Promoting interventions aimed at enhancing psychological well-being may make adolescents more likely to engage in positive behaviors, such as prosocial ones, in a variety of contexts, thereby creating favorable social environments.

A BROAD OVERVIEW OF THE AVIFAUNA OF SECONDARY FORESTS IN PERUVIAN AMAZONIA

In the Peruvian Amazon, we conducted an extensive survey of bird species in six secondary forests. We used the point count method and established 360 survey points (60 in each zone) at least 500 meters away from the others. These observations covered six zones across nine departments, including Loreto, Amazonas, San Martín, Ucayali, Huánuco, Pasco, Junín, Cusco, and Puno, at altitudes ranging from 96 to 2501 meters. We assessed these forests in both dry and rainy seasons with two consecutive days of observations at each point. Our findings revealed high species richness in every zone, with a total of 628 bird species identified, including one Endangered, and five Vulnerable according to the IUCN. Passeriformes was the order with the most species registered, while Tyrannidae and Thraupidae were the most species-rich families. Zones within protected areas exhibited higher species richness compared to adjacent unprotected zones. These results highlight the crucial role of secondary forests in conserving a significant number of bird species despite compositional changes.

Ecological Systems Classification: Integrating Machine Learning, Ancillary Modeling, and Sentinel-2 Satellite Imagery

Spatial land cover depictions are essential for ecological and environmental management. The thematic resolution of land cover and vegetation maps is also a significant factor affecting the ability to effectively develop policy and land management decisions based on spatial data. Natural resource and conservation planners often seek to develop strategies at broad scales; however, high-quality spatial data depicting current vegetation and ecosystem types over large areas are often unavailable. Since widely available land cover and vegetation datasets are generally lacking in either thematic resolution or spatial coverage, there is a need to integrate modeling approaches and ancillary data with traditional satellite image classifications to produce more detailed ecosystem maps for large areas. In this study, we present a comprehensive approach using satellite imagery, machine learning, and ancillary modeling approaches to develop high-resolution ecological system type maps statewide for Arkansas, USA. A RandomForest land cover classification of Sentinel-2 imagery was generated and further articulated into ecological types using a comprehensive set of secondary modeling approaches. A total of 123 types were mapped in Arkansas, including common cultural and ruderal land cover and vegetation such as pine plantations and developed types. Ozark–Ouachita Dry–Mesic Forest covered the most area, 17.51% of the state. Row Crops covered 17.16%. Twenty-five pine or pine plantation types covered 19.73% of the state, with Ozark–Ouachita pine woodland or mature pine plantation covering 6.15%. Field survey points were used to assess the quality of the mapped ecological systems. The approaches presented here provide a framework for finer resolution mapping of ecological systems at broad scales in other regions.

3D modeling of geological and geotechnical soil characterization using the MASW method: a case study in Southern Ijaw LGA, Bayelsa State, Nigeria

The Multichannel Analysis of Surface Waves (MASW) method is pivotal for non-invasive subsurface shear-wave velocity profiling, essential in geotechnical and seismic investigations. This study aims to model 3D geological and geotechnical soil properties in Southern Ijaw LGA, Bayelsa State, Nigeria, using MASW. Data collection involved a 12-channel ABEM Terraloc Mark 6 geophone system across nine survey points, complemented by nine boreholes and two Standard Penetration Tests (SPT). The results revealed a shallow water table at 0.30 m and stratified soil layers ranging from soft clay to dense sands. SPT N-values increased from 2 at the surface to 34 in deeper layers, reflecting significant soil densification and strength enhancement with depth. Shear-wave velocities (Vs) ranged from 207.11 m/s at 0.87 m to 502.88 m/s at 12.9 m, while compressional-wave velocities (Vp) ranged from 388.71 m/s to 948.98 m/s. Poisson’s ratio was consistent at 0.3, indicating uniform properties across depths. Elastic moduli, including shear modulus (µ), Young’s modulus (E), and bulk modulus (K), increased with depth, indicating greater subsurface material stiffness. The 3D geological model delineated distinct layers: soft clay (0–3.61 m), silty clay (3.61–5.19 m), fine sand (5.19–6.55 m), medium sand (6.55–7.83 m), and medium to coarse sand (7.83–12.90 m). These layers exhibited specific engineering properties, with ultimate and allowable bearing capacities ranging from 154.38 to 543.71 kPa and 51.46 to 181.24 kPa, respectively. MASW-derived N-values showed a strong correlation with traditional SPT N-values (R2 = 0.9401) and shear wave velocities and SPT N-values (R2 = 0.961), confirming MASW's effectiveness for geotechnical characterization. This enhances the precision of 3D soil models and supports more informed engineering decisions. The findings significantly advance the understanding of soil properties, particularly in the Niger Delta.

The Morphology, Standing Stock and Habitat Distribution of Several Bamboo Species in the Reok Sub-District, Manggarai Regency, East Nusa Tenggara Province, Indonesia

Bamboo plays a vital role in preventing soil erosion and conserving water. In East Nusa Tenggara Province, many communities rely on bamboo species, making its cultivation a priority due to the region’s favorable biophysical conditions and available support from Non-Governmental Orgabization as facilitators. Approximately 387 villages have undergone assessment and socialization processes aimed at developing bamboo villages, including the Reok sub-district. One of the next steps in this process is conducting an inventory of bamboo standing stock in the area.This study aims to assess the species diversity and standing stock of bamboo in Reok sub-district. Research was carried out at 11 randomly selected sampling points across six villages, using the single circular plot method (radius of 17.9 m), with a total of 55 plots. Each plot was surveyed to identify and quantify clumps and culms, categorized by age (young, medium, and old). Four bamboo species were identified: Bambusa spinosa, Bambusa vulgaris, Gigantochloa atter, and Dendrocalamus asper. Gigantochloa atter was the most prevalent species, found at nearly all survey points, and had the highest number of clumps and culms. The estimated standing stock of bamboo in the Reok sub-district is 57,496 clumps, with a total of 3,692,890 culms. Gigantochloa atter accounted for the majority, with 35,526 clumps and 1,815,593 culms. This standing stock holds significant potential for further development, as bamboo is a key non-timber forest product (NTFP) in the region, with the potential to enhance the local economy.

Outdoor thermal comfort of urban plaza space under thermoacoustic interactions –Taking Datang Everbright City as an example

The comfort of urban square environments in terms of thermal and acoustic conditions directly influences the quality of people's travel experiences and their overall well-being. This study, represented by Xi'an Datang Everbright City, investigates the impact of thermal-acoustic environments on human comfort in cold regions of China. Four typical spaces within the city square were selected for meteorological measurements and subjective questionnaire surveys to gauge the thermal perception of active crowds. Using the Universal Thermal Climate Index (UTCI) as a thermal benchmark, the study compares the interaction between thermal conditions and acoustic environments. Results indicate that the neutral UTCI in Xi'an urban squares is 14.9 °C, with a neutral UTCI range of 10.8∼19.0 °C and a preferred temperature of 17.1 °C. Positive types of sounds moderately reduce thermal sensation. Moderate environmental sounds alleviate thermal discomfort to some extent among respondents. In environments such as birdsong and flowing water, people prefer higher temperatures, thereby increasing thermal tolerance. Conversely, in noise from traffic or construction, individuals prefer lower temperatures, reducing their thermal tolerance. In environments with broadcasts or conversations, respondents exhibit slightly higher thermal tolerance compared to the average neutral temperature. Finally, based on meteorological characteristics at different survey points and respondent feedback, optimization strategies for design are proposed.

Preventing Falls as a Part of Risk Management in Israeli Geriatric Centers: A Systematic Review

Falls are a noteworthy concern in geriatric centers, regularly driving to extreme wounds, decreased quality of life, and expanded healthcare costs. This efficient survey points to look at the viability of different drop avoidance techniques actualized in Israeli geriatric centers as portion of chance administration. The survey incorporates an examination of numerous ponders centering on natural alterations, staff preparing programs, utilize of assistive gadgets, and patient-centered intercessions. Comes about show that a comprehensive approach combining these procedures is most viable in lessening the frequency of falls among elderly inhabitants. The discoveries emphasize the significance of nonstop observing, staff instruction, and individualized care plans to upgrade the security and well-being of geriatric patients. This survey highlights the basic part of drop anticipation in hazard administration and recommends headings for future investigate and approach advancement.

A Monte Carlo Investigation of Confidence Intervals for a Nondecreasing Series

We consider the problem of estimating a time series of population means from a series of sample surveys when the means are known to be nondecreasing. We introduce the standard survey estimators of the series of means, which are not guaranteed to be nondecreasing. We employ the Pool Adjacent Violators Algorithm (PAVA) to turn the series of standard survey estimates into a nondecreasing series. We introduce five methods of constructing confidence intervals for the series of non-decreasing means: normal-theory intervals based on the standard survey point estimator of the mean and the Taylor series estimator of its variance; normal-theory intervals based on the nondecreasing PAVA estimator of the mean and a unique jackknife estimator of its variance developed here (jackknife-[Formula: see text]); intervals similar to the aforementioned method but based on Student’s-[Formula: see text] distribution (jackknife-[Formula: see text]); analytical intervals due to Morris; and simultaneous confidence limits due to Korn. We report the results of a Monte Carlo simulation and assess the methods’ performance under various scenarios. Jackknife-[Formula: see text] intervals exhibited coverage probabilities that are near the nominal value. Taylor, jackknife-[Formula: see text], and Korn intervals found coverage below the nominal value while Morris intervals were excessively conservative. Jackknife intervals were much narrower than Taylor intervals.

Topographic and Geodetic Survey for Samarkand's Administrative Boundaries

General Background: Administrative and territorial boundary delineation is vital in the effective governance and economic planning of urban regions globally, with digital technologies increasingly integrated into these processes for accuracy and efficiency. Specific Background: In Uzbekistan, the city of Samarkand’s administrative boundaries are undergoing significant realignment as part of a broader initiative to incorporate strategic urban centers and enable digital land management across administrative zones. Knowledge Gap: Existing methods lack precise integration with digital geospatial frameworks, leaving a gap in high-resolution topographic data essential for clear administrative delineation. Aims: This study seeks to develop and apply an accurate, digitally supported methodology for determining the boundaries of Samarkand's administrative units using advanced geodetic and topographic techniques. Results: By utilizing the CREDO DAT program, this study achieved precise boundary coordinates through the automated processing of survey points, and further analysis was conducted using the Panorama program for detailed map orientation. Novelty: This research presents a unique approach by integrating CREDO DAT with geospatial tools in administrative boundary demarcation, enabling accurate and reproducible results that surpass traditional methods in efficiency and scalability. Implications: The findings support the strategic planning of Samarkand’s infrastructure and resource allocation while also laying the groundwork for applying similar methodologies in other urban regions, advancing Uzbekistan’s digital transformation efforts in land management.Highlights: Digital tools enhance accuracy in administrative boundary mapping. CREDO DAT and Panorama software streamline data processing for precise mapping. This method supports effective urban planning and resource management in Samarkand. Keywords: Administrative Zones, Border, Territory, District, City

The impact of telework on mental health: a secondary analysis of the 2023 BelHealth

Abstract Background Teleworking gained ground in most workplaces, but questions remain about its impact on mental health. This research used data from the BELHEALTH cohort, a Belgian longitudinal wellbeing study, to investigate the relationship between the extent of telework and three mental health outcomes: anxiety, depression, and burnout. Methods In June 2023, the quarterly online survey assessed telework frequency (never, monthly, weekly, daily) as well as state of anxiety (GAD-7), depression (PHQ-9) and burnout (BAT-12). A complete case analysis (n = 2,303) of these cross-sectional data was performed with employed participants aged 18-65 years. Logit generalized linear mixed models were constructed, with the mental health outcomes as binary outcomes, telework as ordinal covariates, and occupation, type of job, as random effects. The anxiety, and depression models were controlled for geographical location, sex, age, and education confounders, whereas the burnout model was controlled only for sex, and education due to lack of observations. Results In this secondary analysis, we found that daily telework increased the odds of anxiety by 2.33 (95% CI [1.71; 3.17], p < 0.01), the odds of depression by 2.98 (95% CI [2.16; 4.12], p < 0.001), and the odds of burnout by 1.17 (95% CI [0.87; 1.58], p > 0.05) as compared with not teleworking while controlling for confounders. The category of monthly telework was associated with lower odds of anxiety (0.85; 95% CI [0.67; 1.07], p > 0.05), depression (0.91; 95% CI [0.74; 1.28], p > 0.05), and burnout (0.95; 95% CI [0.79; 1.15], p > 0.05) as compared to not teleworking. Conclusions Full-time teleworkers seem to have a higher odds for negative mental health outcomes. Future studies should focus on the long-term causal mechanisms that explain how telework intensity influences mental health to tailor and optimize current wellbeing initiatives at the workplace. Key messages • Our survey points out that full-time teleworkers seem to be at risk of mental health problems. • The frequency of telework has a mixed influence on mental health, indicating that different employees need tailored wellbeing initiatives.

Vaccination Knowledge, Attitudes, Perceptions, and Educational Needs of Pharmacists in Singapore: A Cross-Sectional Study.

Singapore's adult vaccination coverage is suboptimal, and this can be attributed to a lack of vaccination recommendations and misconceptions. Studies have explored pharmacists' vaccination knowledge, attitudes, and practice behaviour overseas but limited information about pharmacists in Singapore is available. This study aims to investigate pharmacists' vaccination knowledge, attitudes towards providing vaccination services, and their educational needs. A cross-sectional study was conducted on pharmacists in various practice settings using an anonymous online survey. Pharmacists' vaccination knowledge (median: 2; IQR: 1-3), confidence in providing vaccination services (median: 6; IQR: 5-8), and frequency of providing vaccination services (median: 2; IQR: 1-3) were only average. However, 74.3% of pharmacists agreed that they play an important role as vaccine advocates. Apparent differences in knowledge level (p = 0.008), confidence level (p = 0.001), attitude (p < 0.001), and the frequency of educating patients (p = 0.001) and recommending vaccinations (p < 0.001) were observed among pharmacists from different practice settings. The main barriers identified were discomfort with giving injections (38.5%) and a lack of skills or knowledge (28.3%) at the point of survey. Pharmacists see the importance of their role as vaccine advocates. However, their vaccination knowledge, confidence in providing vaccination services, and practice behaviours are only average due to inadequate training. Continuous professional education is required to increase pharmacists' readiness to provide vaccination services.

Assessment of coastal flood risk scenarios on infrastructure in the Keta municipality in Ghana using a GIS approach

Coastal flooding and erosion, caused by climate change-induced sea level rise, pose significant threats to low-lying coastal areas worldwide. The African continent, including Ghana, has experienced severe impacts from these hazards, affecting the socio-economic development of coastal communities. This research focuses on the Keta municipality in Ghana. The Keta municipality is highly vulnerable to coastal flooding and erosion due to its low elevation and the construction of the Akosombo hydroelectric dam. This research aims to predict the impact of coastal flooding on infrastructure in the Keta municipality using different flood scenarios. It also fills the existing knowledge gap in understanding how future flood risk can impact on critical infrastructure and consequently on other vital socio-economic sectors in the coastal community of Keta. The study utilizes a Geographic Information System (GIS)-based approach, combining various datasets, including topographic data, administrative shapefiles, field survey points, and infrastructure data. Two flood scenarios were considered to assess areas at risk: a 2.5-m sea level flood scenario representing potential climate change events and a worst-case 5-m sea level flood scenario. The findings reveal that 3.3 km2 (9 %) of coastal land area, 3.9 km of roads, and 69 structures are at risk under a 2.5m sea level rise scenario, increasing to 7.1 km2 (19.4 %), 13.6 km of roads, and 667 structures under a 5m scenario. The study highlights the urgency of addressing these risks to protect coastal communities' socio-economic development and livelihoods. Recommendations include implementing appropriate coastal management strategies, improving infrastructure resilience, and promoting sustainable land-use practices. By understanding and addressing the future impact of coastal flooding, decision-makers can mitigate climate change's adverse effects on coastal areas and ensure the region's long-term sustainability.

Imaging of upper breakpoints of buried active faults through microtremor survey technology

Detecting buried active faults presents the challenge of precisely locating the upper breakpoint, the shallowest point in the Quaternary system where faults occur. Microtremor survey technology, unaffected by urban electromagnetic interference, offers an eco-friendly and efficient method for investigating buried faults and stratigraphic structures in urban areas. This research uses microtremor survey technology to identify the upper breakpoint of the buried Nankou-Sunhe Fault in Changping, Beijing. For data collection, 17 microtremor survey points were deployed across the northern section of the Nankou-Sunhe fault, employing a three-point nested circular array with a point spacing of approximately 200 m to form a profile spanning approximately 320 m. For data analysis, the spatial autocorrelation method was utilized. Each measurement point was divided into 9 sets of radii, ranging from a minimum of approximately 4 m to a maximum of 28 m. The correlation coefficients for each set were calculated, and the dispersion curve for each measurement point was generated by fitting the average coefficients with the Bessel function of the first kind of order zero. The apparent S-wave velocity was determined directly from the dispersion curve using empirical formulas and interpolated to generate the contour cross-section map. Integrating the section and inverted S-wave velocity data can significantly enhance interpretation accuracy, and based on these data, the spatial development characteristics and upper breakpoint locations of the Nankou-Sunhe fault zone were analyzed, and the strata shallower than 100 m were deduced. The results align well with known geological data, such as luminescence dating and 14C dating from boreholes at nearby locations.Graphical