scholarly journals Regional-scale analysis of lake outburst hazards in the southwestern Pamir, Tajikistan, based on remote sensing and GIS

2011 ◽  
Vol 11 (5) ◽  
pp. 1447-1462 ◽  
Author(s):  
M. Mergili ◽  
J. F. Schneider
Keyword(s):  
Remote Sensing ◽  
Risk Mitigation ◽  
Regional Scale ◽  
Remote Sensing And Gis ◽  
Scale Analysis ◽  
Empirical Modelling ◽  
Medium Resolution ◽  
Area 6 ◽  
Rating Scheme ◽  
Selection Of

Abstract. This paper presents an analysis of the hazards emanating from the sudden drainage of alpine lakes in South-Western Tajik Pamir. In the last 40 yr, several new lakes have formed in the front of retreating glacier tongues, and existing lakes have grown. Other lakes are dammed by landslide deposits or older moraines. In 2002, sudden drainage of a glacial lake in the area triggered a catastrophic debris flow. Building on existing approaches, a rating scheme was devised allowing quick, regional-scale identification of potentially hazardous lakes and possible impact areas. This approach relies on GIS, remote sensing and empirical modelling, largely based on medium-resolution international datasets. Out of the 428 lakes mapped in the area, 6 were rated very hazardous and 34 hazardous. This classification was used for the selection of lakes requiring in-depth investigation. Selected cases are presented and discussed in order to understand the potentials and limitations of the approach used. Such an understanding is essential for the appropriate application of the methodology for risk mitigation purposes.

scholarly journals Land Suitability Analysis for UrbanPlan Preparation Using Remote Sensing and GIS A Case of Anand-Vidyanagar-Karamsad Development Plan

10.29007/xcm1 ◽  
2018 ◽  
Author(s):  
Mehul Darshak ◽  
Rajan Zala ◽  
Manthan Bhandari ◽  
Dr. Shashikant Kumar
Keyword(s):  
Remote Sensing ◽  
Urban Development ◽  
Remote Sensing And Gis ◽  
Land Suitability ◽  
Development Plan ◽  
Gis Analysis ◽  
Suitability Analysis ◽  
Land Utilization ◽  
Land Suitability Analysis ◽  
Selection Of

Land Suitability analysis is important for preparation of Development Plan. The planning requires undertaking study of topography, water resources, land utilization, and development needs. The RS & GIS techniques offers suitable analytical opportunity to study variables required for selection of sites for various uses. This paper presents process adopted for the preparation of development plan of Anand Vidyanagar Karamsad Urban Development Authority (AVKUDA), regarding the land suitability analysis. The location and types of land to be protected were identified using RS Data and GIS analysis. Keywords— AVKUDA; Land Suitability; Planning; RS & GIS

scholarly journals Regional-scale analysis of high-mountain multi-hazard and risk in the Pamir (Tajikistan) with GRASS GIS

2013 ◽  
Vol 1 (2) ◽  
pp. 1689-1747
Author(s):  
F. E. Gruber ◽  
M. Mergili
Keyword(s):  
Risk Mitigation ◽  
Spatial Scales ◽  
Regional Scale ◽  
Mitigation Measures ◽  
High Mountain ◽  
Scale Analysis ◽  
Model Framework ◽  
Rock Face ◽  
Grass Gis ◽  
Hazard And Risk

Abstract. We present a model framework for the regional-scale analysis of high-mountain multi-hazard and -risk, implemented with the Open Source software package GRASS GIS. This framework is applied to a 98 300 km2 study area centred in the Pamir (Tajikistan). It includes (i) rock slides, (ii) ice avalanches, (iii) periglacial debris flows, and (iv) lake outburst floods. First, a hazard indication score is assigned to each relevant object (steep rock face, glacier or periglacial slope, lake). This score depends on the susceptibility and on the expected event magnitude. Second, the possible travel distances, impact areas and, consequently, impact hazard indication scores for all types of processes are computed using empirical relationships. These scores are finally superimposed with an exposure score derived from the type of land use, resulting in a raster map of risk indication scores finally discretized at the community level. The analysis results are presented and discussed at different spatial scales. The major outcome of the study, a set of comprehensive regional-scale hazard and risk indication maps, shall represent an objective basis for the prioritization of target communities for further research and risk mitigation measures.

scholarly journals Determining Causes of Gully Erosion and Associated Rates of Change in South-east Nigeria, Using a Remote Sensing and GIS Methodology

2020 ◽  
Author(s):  
Sylvanus Ibeabuchi Iro
Keyword(s):  
Remote Sensing ◽  
Early Stage ◽  
Regional Scale ◽  
Remote Sensing And Gis ◽  
Gully Erosion ◽  
High Association ◽  
Rates Of Change ◽  
Consistent Field ◽  
Vegetation Loss ◽  
Variance Explained

Abstract In this work a study of gully erosion in southeast Nigeria is presented. The study of gully development on a regional scale is currently undermined by the inherent costs associated with consistent field monitoring and the lack of historic measurements to perform time series analysis. The analysis of study area topography at 30m resolution reveals 85% of the surveyed gullies develop on concave slopes with high values of 6 plan curvatures and >50 inclines. Results also reveal high association with ferralsols soils. Statistical analysis to determine significance of variables on the proportional yearly gully change in metre squared per square metre were conducted via principle component analysis. The analysis of this work was restricted to the time periods 2006/7, 2009/10, and 2014/15. The approach did not report any existence of one singular driver of erosion across the studied years and multiple sites confirming the complexity of gullies. The PCA showed that the level of variance explained in the yearly gully change variable was most similar in PC1 (representing the component with the highest eigenvalue) to Vegetation loss, Vegetation loss and slope in the respective years.The study offers a method of monitoring gully development from early stage to maturity and exemplifies the complexity and variability of erosion drivers in the SE Nigeria region. It presents a verified approach to local and regional monitoring of gullies, enacted through use of low budget/computing cost remote sensing and classification technologies, and serves to embolden civilian and governmental efforts to manage the societal and environmental menace of gully erosion.

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