Members’ Publication

Sustainable management of resources (SRM) is most crucial in achieving sustainable development goals in countries with a high population density like Bangladesh. This study aimed to summarize the natural and manmade influences and interferences in SRM in Bangladesh through a systematic literature review. The study also proposed a framework for linking natural and manmade interferences. This study reviewed the natural and man-made hazards in Bangladesh to highlight their impact on SRM. Result shows that environmental degradation is primarily caused by activities for economic reasons, including shrimp cultivation, deforestation, hill-cutting, brick-kilns, and the discharge of waste into rivers. Rapid population growth, industrialization, and urbanization are man-made factors that are putting pressure on land and water resources, leading to deforestation, soil erosion, and pollution. Natural factors, such as climate change, geography, and natural disasters, pose challenges to SRM by affecting water, agriculture, and fisheries. Both these natural and man-made events generate some drastic consequences, like soil erosion, food insecurity, salinity, coastal hazards, degradation of underground water levels, increased pollution, fire hazards, road accidents, building collapse, reduction of soil fertility, damage to biodiversity, and so on. Political interventions like unskilled manpower, corruption, ill-leadership, inadequate accountability and transparency, resource distribution, etc. also affect resource management in Bangladesh. Overall study demonstrated the need for a multi-faceted approach to address these challenges, including investments in sustainable development, disaster risk reduction, and environmental conservation. By defining the necessary initiatives, like financial support, community-based autonomy, empowerment of local government bodies, and sector-based policies, this study will help minimize these losses.

Hard rock systems are typically characterized by undulated landscapes, short flow path, dense drainage network, and low aquifer storage. If located in water-limited environments (WLE), then typically have variable rainfall characteristics, frequent floods and droughts, and savannah type of vegetation capable to uptake groundwater. In such environments, surface–groundwater interactions are of primary importance. In this study, surface–groundwater interactions are analyzed focusing on spatiotemporal net recharge dependence on hydrotopes, where a hydrotope is conceptualized as spatial unit (or object), which at a given scale of assessment can be assumed as internally homogeneous (e.g. tree canopy or rock outcrop) but hydro(geo)logically different than the adjacent area. The study is carried out in the small (7.6 ha) Trabadillo study area (TSA) in Spain, representative for hard rocks of WLE using 3D-GSFLOW integrated hydrological model (IHM) at very fine grid (5x5m), extracted from coarser grid (100x100m) of Sardon 3D-GSFLOW model (Hassan et al., 2014, Journal of Hydrology 517, 390–410). The IHM was calibrated using: (i) 20-year head observation; (ii) 8-year soil moisture observations at 4 profiles, each at different hydrotope and each at 4 different depths; and (iii) MODIS satellite earth observation of evapotranspiration. Despite applying spatially uniform rainfall as forcing, surface–groundwater interactions were highly spatially variable, primarily, because of hydrotope-differences in rainfall interception loss and secondarily, because of differences in transpiration, in subsurface evaporation and in hydrological properties of subsurface. The high temporal variability of rainfall, ranging yearly from 310 to 925 mm, resulted in high temporal variability of all water fluxes, including groundwater fluxes; e.g. gross recharge (Rg) varied annually from 2 to 445 mm, net recharge (Rn), from −50 mm to + 89 mm, while the 20-year mean Rn was close to zero, because Rg was counterbalanced by groundwater exfiltration and less by groundwater evapotranspiration. The high temporal variability of groundwater fluxes and many dry years with largely negative Rn, in combination with low aquifer storage, emphasized TSA dependence on rainfall and its vulnerability to droughts. The hydrotope modeling concept applied at the very fine scale, emphasized also large Rn dependence on land cover type, especially on density and species composition of trees, invisible at coarser scale modeling. As such, the proposed hydrotope modelling approach can be applied as a tool to test whether in a given environment planting (or cutting) trees will result in increase or decrease of water resources.

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As bike-share systems proliferate across the US, a deeper understanding of current bike-share users could enable an expansion of these services and their benefits to a larger population. To grow bike-share demand sustainably and equitably, cities must understand how different segments of the population use this service. Understanding the different segments within a market enable operators to develop strategies that are tailored toward the needs of each segment. This study uses data from bike-share user surveys in the Sacramento region to perform market segmentation based on perceptions of the bike-share service, mode use patterns, and bike-share use. We focus on the market segments with more limited means of transportation: low-income individuals, zero-car households, students, and transit and car-share users. The results show that individuals with low incomes, those without cars, and students use the service frequently for commuting and a variety of non-commuting purposes. Bike-share is generally adopted by all mode user groups but is used at a higher rate by the super multimodal and active multimodal groups. The occasional users of the bike-share service are mainly those with higher incomes and individuals who have access to a personal car. The segments consisting of non- and infrequent-personal bike users use the bike-share service at a greater rate for different purposes than regular bicyclists, suggesting that bike-share may act as a lever for increasing bike travel for some users. Results from data mining suggest that bike-share operators should target low-income and zero-car owners for new recruitment as these groups are more likely to use bike-share frequently. The results provide insights that may be helpful to cities as they consider strategies to increase bike-share demand in a way that enhances social equity.

This study explores mode-specific problems faced by movement-challenged persons (MCPs) in making trips by different travel modes in Dhaka, Bangladesh. 400 MCPs were asked to rank the extent of mobility challenges of four modes on a scale of one to five through a questionnaire survey. MCPs reported lack of ramp and undulated surface are the most severe problems related to bus and walking respectively while excessive fared charged by drivers is found as the most severe problem for both rickshaw and CNG. This study captures the uneven effects of mode-specific challenges endured by MCPs of different gender, ages, and mobility aid users. Opinions on the lack of standardized slope along footpaths, the presence of cracks on footpaths, the lack of ramps on the buses, and rude behavior of bus staff vary significantly with gender, age, and mobility aids; the unwillingness of bus staff to carry MCPs varies significantly with age and walking instrument; the narrow width of footpaths, the additional fare charged by rickshaw pullers, the lack of space to keep the mobility supporting aids on buses and rickshaws, and the lack of available space to maneuver on a bus varies significantly with the walking instrument.