Fig 5 - uploaded by H.R. Pasindu
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Scatter plot of Engineer's performance rating and calculated performance index of data set used for validation
Source publication
Provincial level and Local roads comprise nearly 50% of the road network in mileage in Sri Lanka. They play a pivotal role in providing access to the local communities especially in rural areas and an essential component of the economic development of those areas. These roads are under the purview of Local Councils and Provincial Road Development A...
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With the increasing population and intensive land use, huge traffic demand is generating worldwide both in developing and developed countries. As a developing country, Bangladesh is also facing the same problem in recent years by producing huge numbers of daily trips. As a matter of fact, extensive traffic demand is increasing day by day. Also, tra...
Citations
... Despite the importance of LI networks on the development of Sri Lanka, no comprehensive island-wide studies have focused on the spatial patterns of impacts of LI networks on natural habitats. Nonetheless, several independent studies have provided insights into land use change at both islandwide and regional scales (Edirisooriya, et al., 2021;Rathnayake, et al., 2020;Saparamadu, et al., 2018;Zahir et al., 2021), along with recommendations to enhance the structural integrity and transportation efficiency of the road network (Abesinghe & Jayatilake, 2020;Chandimal & Wijesekera, 2008;Pasindu, et al., 2018). For example, Rathnayake et al. (2020) present a country-wide land use land cover (LULC) change map for Sri Lanka over 25 years using Landsat time-series imagery from 1993 to 2018, while Saparamadu et al. (2018) report on land use change and related environmental characteristics such as land surface temperature (LST), surface water quality, and soil characteristics in Colombo, the commercial capital of the country. ...
... For example, Rathnayake et al. (2020) present a country-wide land use land cover (LULC) change map for Sri Lanka over 25 years using Landsat time-series imagery from 1993 to 2018, while Saparamadu et al. (2018) report on land use change and related environmental characteristics such as land surface temperature (LST), surface water quality, and soil characteristics in Colombo, the commercial capital of the country. Studies that focused on enhancing the structural and functional performance of the road network have investigated the effects of climate change on roads (Abesinghe & Jayatilake, 2020) and proposed strategies to improve road safety, decrease travel time, and increase efficiency (Chandimal & Wijesekera, 2008;Pasindu et al., 2018). ...
Linear infrastructure (LI) has varying effects on landscapes depending on different ecosystems' sensitivity and threat levels. Economically developing tropical countries are particularly at risk from LI. Therefore, understanding a country’s current LI network and planning future developments to avoid further fragmentation and disturbance is crucial. This study aimed to assess the extent of Sri Lanka’s LI network (i.e., roads, railroads, and powerlines), given that it is both a biodiversity hotspot and an economically developing country in the tropics. First, we calculated the average normalized difference vegetation index (NDVI) and normalized difference built-up index (NDBI) indices and examined their spatial autocorrelation per divisional secretariat division. Then a multivariate cluster analysis was used to determine clusters of natural and protected areas that may receive similar impacts from different LI and their combinations. Results indicated that roads are the most widespread LI type in Sri Lanka, followed by powerlines and railroads. Over 80% of Sri Lanka’s total land area falls within 1 km of either a national or a provincial/local road. Areas with high NDVI were primarily manmade habitats, with less than 20% contribution from protected areas. Over 50% of the total protected area of Sri Lanka is being impacted by all three types of LI. Powerlines were the most common LI type in protected areas in proportion to their total network lengths. To minimize environmental impact while achieving development goals, future LI development activities should use a landscape approach to identify development needs and strategies informed by these findings.
