Warta Geologi最新文献_第4页

Key Principles And Approaches In Geohazard Communication For Enhancing Disaster Resilience 提高灾害恢复力的地质灾害信息传播关键原则和方法

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202012

A. Thompson, United Kingdom Cuesta Consulting Limited, B. Marker, J. Poole, J. Pereira, Choun-Sian Lim, Yunus Abdul Razak, J. Hunt, United Kingdom Cuesta Consulting Limited

引用次数: 0

Slope stability assessment in opencast quarry – an UAV approach 露天采石场边坡稳定性评价——无人机方法

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202009

Nur Emilia Qistina Mohd Anua, H. Zabidi, Aisyah Shahirah Juhari, S. Yaacob, Syaran Suri

引用次数: 1

The shaping and demise of the Tusan Beach “Drinking Horse”, southwest of Miri, Sarawak 砂拉越美里西南土山海滩“饮马”的形成与消亡

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202001

F. Kessler, J. Jong

引用次数: 0

Earth crustal analysis of Northwest Sabah region inferred from receiver function method 基于接收函数法的沙巴西北地区地壳分析

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202004

A. H. Abdul Latiff, F. Othman

引用次数: 0

Geoscience activities amid the Covid-19 pandemic – opportunities for cross-discipline learning and knowledge-sharing 2019冠状病毒病大流行期间的地球科学活动——跨学科学习和知识共享的机会

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202012

M. Madon

引用次数: 2

The geology and stratigraphic framework of the Kuching Zone Sarawak: Current understanding and unresolved issues 砂拉越古晋地区的地质和地层格架:目前的认识和未解决的问题

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202003

Najiatun Najla Mohamad, Abdul Hadi Abd Rahman, M. Ismail

引用次数: 4

Application of UAV photogrammetry for quarry monitoring 无人机摄影测量在采石场监控中的应用

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202006

S. K. Nagendran, Mohd Ashraf Mohamad Ismail

引用次数: 4

The effect of land reclamation on water clarity in Tanjung Tokong using remote sensing 土地复垦对丹中香港水质的影响

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202007

N. Rosman, Aisah Taufik, Ismail Ahmad Abir

{"title":"The effect of land reclamation on water clarity in Tanjung Tokong using remote sensing","authors":"N. Rosman, Aisah Taufik, Ismail Ahmad Abir","doi":"10.7186/wg462202007","DOIUrl":"https://doi.org/10.7186/wg462202007","url":null,"abstract":"Field data (Secchi Disk Depth) of coastal water surrounding the reclaimed land located off the coast of Tanjung Tokong, Penang was taken on the same date as the overpass of Landsat 8 image on the 20 th December 2017. Results from Secchi Disk readings show that, in general, the water clarity is worse near the reclaimed land when compared to protected areas, such as the National Park coastal area in northwest Penang. Furthermore, it was observed that Secchi depths become shallower to the northwest of the reclaimed land in comparison to the southern part. In order to estimate the Secchi Disk Depth using Landsat data, correlation between field data and satellite data was studied using linear regression approach. Correlation between ground data and atmospherically corrected satellite image for Band 5 (Near Infrared) was found to be the most robust with correlation coefficient close to one (R²=0.7051). The selected linear regression model was then applied to estimate the Secchi Depth for the entire image and for archive Landsat 8 images of the study area. In addition, ocean bottom soil samples taken around the reclaimed land are of very fine and muddy nature, which was previously of a sandy nature; a healthy environment for crabs, molluscs and other organisms. Very fine sediments are in suspension in high energy environment resulting in lower water clarity and a decrease in light penetration. Although the degraded coastal water clarity of Tanjung Tokong suggests that the reclaimed land has an adverse effect on its water quality, important environmental factors, such as tides, waves and currents must be taken into account to fully understand their effects on coastal water clarity.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131852690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rock slope discontinuity extraction from 3D point clouds: Application to an open pit limestone quarry 从三维点云提取岩石边坡不连续面:在露天石灰石采石场的应用

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202011

Syaran Suri, Aisyah Shahirah Juhari, S. Yaacob, N. Anua, H. Zabidi

{"title":"Rock slope discontinuity extraction from 3D point clouds: Application to an open pit limestone quarry","authors":"Syaran Suri, Aisyah Shahirah Juhari, S. Yaacob, N. Anua, H. Zabidi","doi":"10.7186/wg462202011","DOIUrl":"https://doi.org/10.7186/wg462202011","url":null,"abstract":"Discontinuities dominantly play a key role in the mechanical, hydraulic and deformational behavior of rock masses, frequently having a considerable influence on the stability of rock slopes. Thus, it is importance to have a profound knowledge about the discontinuity network in rock engineering. Meanwhile, quarry is a common place for instability of the rock slope happens due to the activities on site such as excavation and blasting. These activities eventually create fractures, faults, and joints. Traditional measuring techniques are prone to human bias and provide only a rough knowledge about the discontinuity network. To increase the reliability of discontinuity models, digital mapping techniques such as Structure from motion (SfM) using data from Unmanned Aerial Vehicle (UAV) and remote sensing, like Close-Range Terrestrial Digital Photogrammetry, were developed. This paper focuses on the plane identification within 3-D point clouds using Discontinuity Set Extractor (DSE) in MATLAB® (The Mathworks Inc.). The 3-D point cloud is generated with the program Agisoft PhotoScan Professional digital photogrammetry software (version 1.1.6) from photos using UAV method. To verify the plane identification with MATLAB® the results were compared with manual mapping. Rosette plot of both methods show the same direction but different in quantity of the discontinuities set. The most dominant direction is N330 ̊ N340 ̊ on NNW-SSE. While, the least dominant discontinuities orientation happens to occur at E-W with the direction of N080 ̊-N090 ̊.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132648094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The characteristics and morphology of columnar dacite in Tawau, Sabah 沙巴州斗湖柱状英安岩的特征和形态

Warta Geologi Pub Date : 2020-08-31 DOI: 10.7186/wg462202002

E. James, H. F. W. Soehady Erfen, Azman A. Ghani, Angela Vidda Chuwat, Gerald Eko Ejiga

引用次数: 1