South African Geographical Journal最新文献_第8页

An assessment of ultrasonic pulse velocity measurement as a viable proxy for weathering in South African gabbro tombstones 超声脉冲速度测量作为南非辉长岩墓碑风化的可行代理的评估

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-06-05 DOI: 10.1080/03736245.2021.1932564

M. Loubser

{"title":"An assessment of ultrasonic pulse velocity measurement as a viable proxy for weathering in South African gabbro tombstones","authors":"M. Loubser","doi":"10.1080/03736245.2021.1932564","DOIUrl":"https://doi.org/10.1080/03736245.2021.1932564","url":null,"abstract":"ABSTRACT Ultrasonic pulse velocity (UPV) measurement has previously been determined to be a good proxy for rock weathering intensity. As such, it has the potential to be useful for the establishment of relative weathering rates in culturally sensitive artefacts such as tombstones. This is the first study that makes use of an ultrasonic proxy in this manner to be carried out in South Africa, where many tombstones are constructed from locally produced gabbro stone. However, the delimitations of ultrasonic equipment have not been appropriately established for use on this particular lithology. This study investigates the relationship between UPV and the amount of time various tombstones have spent in situ at Cullinan Main Cemetery in South Africa, with the aim of determining if UPV can accurately be used to assess relative weathering rates for the tombstones there. Ultrasonic measurements were taken with two different transducer packages on 34 tombstones that had remained in the cemetery for between 15 and 100 years. The results show that there is a measurable, statistically significant positive relationship between inscription age and ultrasonic pulse velocity (UPV), supporting the hypothesis that UPV is a valid proxy for rock weathering with respect to South African gabbro tombstones.","PeriodicalId":46279,"journal":{"name":"South African Geographical Journal","volume":"59 1","pages":"107 - 121"},"PeriodicalIF":1.4,"publicationDate":"2021-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80693843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"社会学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Barriers for local authorities to invest in disaster risk reduction: evidence from Zimbabwe 地方当局投资于减少灾害风险的障碍:来自津巴布韦的证据

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-06-04 DOI: 10.1080/03736245.2021.1934092

E. Mavhura, J. Mapuva

引用次数: 0

Understanding students’ environmental perceptions and some of their determinants in Gauteng province: a case study at the University of Johannesburg, South Africa 了解豪登省学生的环境观念及其一些决定因素:以南非约翰内斯堡大学为例

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-04-26 DOI: 10.1080/03736245.2021.1917447

S. Dlamini, E. Block, I. Rampedi

引用次数: 1

Extreme Temperature Events (ETEs) in South Africa: a review 南非极端温度事件(ETEs):综述

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-04-05 DOI: 10.1080/03736245.2021.1907219

A. J. van der Walt, J. Fitchett

{"title":"Extreme Temperature Events (ETEs) in South Africa: a review","authors":"A. J. van der Walt, J. Fitchett","doi":"10.1080/03736245.2021.1907219","DOIUrl":"https://doi.org/10.1080/03736245.2021.1907219","url":null,"abstract":"ABSTRACT Extreme Temperature Events (ETEs), including heatwaves, warm spells, cold waves and cold spells, have disastrous impacts on human health and ecosystems. The frequency, intensity, and duration of ETEs is projected to increase due to climate change. However, very little research has been done on ETEs in South Africa, and only a few attempts have been made to identify and examine trends. Currently, ten known publications have examined ETEs across South Africa, the majority of which use the South African Weather Service (SAWS) climate database as the primary source. The general findings indicate that the incidence and duration of extreme warm temperatures are increasing, while cold extremes are decreasing. However, inconstancies exist in the indices used to identify ETEs, selection of meteorological stations, study period, and statistical methods used to examine trends. We review the methodological approaches to define ETEs, the extreme temperature indices adopted, the selection of meteorological stations, study periods, data quality and homogeneity, statistical trend analysis, and results. From these, we propose an approximate number of stations to adequately portray temperature variability on a national and regional level. Finally, we reflect on projections of ETEs under current climate change conditions, and the implications of cold and warm ETEs in a South African context.","PeriodicalId":46279,"journal":{"name":"South African Geographical Journal","volume":"25 1","pages":"70 - 88"},"PeriodicalIF":1.4,"publicationDate":"2021-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85294453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"社会学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Google trends and water conservation awareness: the internet’s contribution in South Africa 谷歌趋势与节水意识:互联网对南非的贡献

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-03-24 DOI: 10.1080/03736245.2021.1901239

A. Pretorius, E. Kruger, S. Bezuidenhout

引用次数: 1

Birdwatching in a southern African context: explaining highlights on bird lists 南非观鸟:解释鸟类名单上的亮点

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-02-28 DOI: 10.1080/03736245.2021.1894597

Rivash Pahlad, Ş. Procheş

{"title":"Birdwatching in a southern African context: explaining highlights on bird lists","authors":"Rivash Pahlad, Ş. Procheş","doi":"10.1080/03736245.2021.1894597","DOIUrl":"https://doi.org/10.1080/03736245.2021.1894597","url":null,"abstract":"ABSTRACT Although amateur birding makes important contributions towards conservation and the tourism industry, the precise motivations driving birders have not been extensively investigated. The aims of this study were to analyse birders’ highlights for birding trips within southern Africa and to establish whether local and foreign birders preferred to see rare or morphologically unusual birds, as opposed to common or morphologically indistinct birds. Morphological traits included: average body size, colour and unusual features; rarity-related traits included: maximum abundance, and range. A total of 673 terrestrial birds were included, and morphological and rarity-related traits were recorded for each species. Birding trip reports for long (two to four weeks) trips across southern Africa that included full sightings lists and highlights were used to indicate which species qualified as highlights (morphologically unusual, rare or both). Both among local and foreign birders, large-bodied birds were the main highlights, with the other characteristics not retrieved as significant. This contradicts the expectation that local birders would be more interested in rarity; however, this result could be explained by the fact that only long birding trips were considered, whereas rarity may more often be sought by specialized local birders on shorter, targeted trips.","PeriodicalId":46279,"journal":{"name":"South African Geographical Journal","volume":"26 1","pages":"411 - 419"},"PeriodicalIF":1.4,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78348967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"社会学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Issues of measuring and interpreting wind direction 测量和解释风向的问题

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-02-09 DOI: 10.1080/03736245.2021.1883471

J. Knight, J. Fitchett

引用次数: 0

Sensitivity of a standard Land Use Cover change cellular automata model to resample input Land Use Cover maps 标准土地利用覆盖变化元胞自动机模型对输入土地利用覆盖图重新采样的敏感性

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-01-14 DOI: 10.1080/03736245.2021.1872413

David García-Álvarez, María Teresa Camacho Olmedo

引用次数: 3

The relationship between barchan size and barchan morphology: a case study from Northern Namibia barchan尺寸与形态的关系:以纳米比亚北部barchan为例

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2021-01-05 DOI: 10.1080/03736245.2021.1876753

B. J. van der Merwe

引用次数: 1

LiDAR derived shack footprint for the City of Cape Town, South Africa 激光雷达为南非开普敦市绘制的棚屋足迹图

IF 1.4 4区社会学

South African Geographical Journal Pub Date : 2020-12-29 DOI: 10.1080/03736245.2020.1863253

Moreblessings Shoko, J. Smit

{"title":"LiDAR derived shack footprint for the City of Cape Town, South Africa","authors":"Moreblessings Shoko, J. Smit","doi":"10.1080/03736245.2020.1863253","DOIUrl":"https://doi.org/10.1080/03736245.2020.1863253","url":null,"abstract":"ABSTRACT Shack extraction is a growing application area for solving contemporary geographical complexities in developing countries. Traditional ground-based surveys that provided shack counts are being overtaken by the opportunities around rapid advances in spatial data collection. The ability to automate and report high accuracies against ground truth remains key to the complex nature of the digital shack extraction matrix. This study uses 8 cm aerial footage and laser scanning data to map informal settlement areas within built environments. The research design includes a set of experiments in defining the footprint of shacks obtained through profiling sampled shack/non-shack areas. Average shack heights, behaviour of unclassified points, number of non-ground points, scan texture and intensity variations were investigated. A five-parameter signature was applied to a pit-free normalized digital surface model (NDSM) and as expected on both test and validation, proved suitable for distinct shacks identification. This approach reported a 95% large settlement detection within a 1-metre-wide boundary position tolerance, coupled with a few false positives in isolated cases of multi-storey, sheds and also complex shacks. The results are proposed for inclusion in city-wide urban planning frameworks that can also be tweaked to include social and environmental parameters.","PeriodicalId":46279,"journal":{"name":"South African Geographical Journal","volume":"31 1","pages":"1 - 15"},"PeriodicalIF":1.4,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86020651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"社会学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2