Dikshya Regmi - Academia.edu (original) (raw)

Papers by Dikshya Regmi

Deleted Journal, Feb 21, 2024

Nepalese Journal of Zoology

Planktons are the community of pelagic organisms, composed of different groups, which are in susp... more Planktons are the community of pelagic organisms, composed of different groups, which are in suspension in water and hence restricted mobility, often less than that of the water which carries them. The study was carried out during the winter of 2019 to observe the phytoplankton and zooplankton abundance and distribution in Ghodaghodi Lake, Nepal. Temperature, pH, electrical conductivity, dissolved oxygen, Secchi disc transparency, total dissolved solids, and turbidity were analyzed during the study. Collection of plankton samples were made by conical-shaped monofilament nylon plankton net of 90 μm mesh net size from approximately 10 ‐ 12 cm depth from six different sites. A total of 58 individuals of zooplankton were enumerated during the present investigation. The maximum number was counted for Mesocyclops sp (n=18) and minimum for Diaptomus (n=1). The highest zooplanktons were reported from site I (n= 12) and the lowest were reported from site II (n=7). Cladocera was the most domi...

This research investigates the heavy metals (Zn, Cd, Cu and Pb) concentration in water, sediments... more This research investigates the heavy metals (Zn, Cd, Cu and Pb) concentration in water, sediments and macrophytes in Ghodaghodi Lake during winter and summer seasons of 2019 to find out the bioaccumulation of metals and phytoremediation potential of locally available macrophytes. Atomic absorption spectrophotometer with acid digestion method was used for analysis of heavy metals. The mean heavy metals concentration during summer and winter season were in the order: Zn > Cu > Pb > Cd in water and sediments. The mean concentrations of Cd, Cu and Pb were significantly higher in winter (0.79±0.71, 12.99±3.16, and 11.39±6.88 mg/g, respectively) than summer season (0.01±0.00, 9.13±5.21, and 2.16±6.64 mg/g, respectively) in sediments which is also supported by geo-accumulation index. Zinc had also higher concentrations in winter (65.29±13.13 mg/g) compared to summer (44.00±21.08 mg/g), though not significant. Ludwigia sp. was more capable of accumulating heavy metals than the Nymp...

Water Quality in the Third Pole

Nepal as being a mountainous country, vulnerability, hazard, and risk is everywhere. This paper c... more Nepal as being a mountainous country, vulnerability, hazard, and risk is everywhere. This paper contributes to the study of disaster-related existing policies in Nepal. The research is based on an extensive literature review and meta-analysis of the existing literature on disaster risk reduction and management. The results revealed that after the state restructuring in 2015, there are several policies either formulated or in the process of formulation. The Constitution of Nepal (2015) has stipulated that DRM is a shared responsibility of all levels of government including federal, provincial, and local levels. Precisely, before 1982, disaster management activities were carried out in an unorganized way. Importantly, it is also highlighted that the Disaster Risk Reduction and Management Act 2017 is the milestone in the DRRM section in Nepal. One of the key aspects of the DRRM Act 2017 is the provision for forming community-based Disaster Preparedness and Response Committees. Thus, th...

Water Quality in the Third Pole, 2020

Abstract The “Third Pole,” centered on the Tibetan Plateau, is also known as the “Water Tower of ... more Abstract The “Third Pole,” centered on the Tibetan Plateau, is also known as the “Water Tower of Asia.” The Third Pole region feeds more than 10 large rivers (e.g., the Yellow River, the Yangtze River, the Yarlung Tsangpo, the Indus, the Amu Darya, etc.) in Asia and there are more than one billion people dependent on the water resources provided by these river basins. In this chapter, an overview of the water chemistry and the geochemical mechanisms that govern the characteristics of major ions and trace elements in rivers of the Third Pole are presented. In general, most rivers of the Third Pole have an alkaline water environment with an average pH of 8.7. As a result of intensive rock weathering within the catchments, the averaged total dissolved solids (~380 mg L−1) in the rivers of the Third Pole are much higher than the global median level. It was found that the dissolved contents in rivers of the Third Pole are dominated by Ca2+, Mg2+, HCO3−, Cl−, and SO42− with a spatial heterogeneity due to the different climates, hydrography, and geology conditions over the region. The main mechanisms that control the water chemistry in the rivers of the Third Pole are natural processes, such as rock weathering, ground discharge, and evaporation-crystallization, and most of the rivers remain pristine. However, it should be noted that due to human factors, such as urbanization and mining operations, toxic elements such as As, Cd, Hg, Mn, and Pb concentrations in some of the rivers in the Third Pole are higher than the permissible limits for drinking water as established by the WHO. With increasing anthropogenic activities and changes within the river basins of the Third Pole, further monitoring of the hydrochemical compositions in rivers over this eco-fragile region is warranted.

Deleted Journal, Feb 21, 2024

Nepalese Journal of Zoology

Planktons are the community of pelagic organisms, composed of different groups, which are in susp... more Planktons are the community of pelagic organisms, composed of different groups, which are in suspension in water and hence restricted mobility, often less than that of the water which carries them. The study was carried out during the winter of 2019 to observe the phytoplankton and zooplankton abundance and distribution in Ghodaghodi Lake, Nepal. Temperature, pH, electrical conductivity, dissolved oxygen, Secchi disc transparency, total dissolved solids, and turbidity were analyzed during the study. Collection of plankton samples were made by conical-shaped monofilament nylon plankton net of 90 μm mesh net size from approximately 10 ‐ 12 cm depth from six different sites. A total of 58 individuals of zooplankton were enumerated during the present investigation. The maximum number was counted for Mesocyclops sp (n=18) and minimum for Diaptomus (n=1). The highest zooplanktons were reported from site I (n= 12) and the lowest were reported from site II (n=7). Cladocera was the most domi...

This research investigates the heavy metals (Zn, Cd, Cu and Pb) concentration in water, sediments... more This research investigates the heavy metals (Zn, Cd, Cu and Pb) concentration in water, sediments and macrophytes in Ghodaghodi Lake during winter and summer seasons of 2019 to find out the bioaccumulation of metals and phytoremediation potential of locally available macrophytes. Atomic absorption spectrophotometer with acid digestion method was used for analysis of heavy metals. The mean heavy metals concentration during summer and winter season were in the order: Zn > Cu > Pb > Cd in water and sediments. The mean concentrations of Cd, Cu and Pb were significantly higher in winter (0.79±0.71, 12.99±3.16, and 11.39±6.88 mg/g, respectively) than summer season (0.01±0.00, 9.13±5.21, and 2.16±6.64 mg/g, respectively) in sediments which is also supported by geo-accumulation index. Zinc had also higher concentrations in winter (65.29±13.13 mg/g) compared to summer (44.00±21.08 mg/g), though not significant. Ludwigia sp. was more capable of accumulating heavy metals than the Nymp...

Water Quality in the Third Pole

Nepal as being a mountainous country, vulnerability, hazard, and risk is everywhere. This paper c... more Nepal as being a mountainous country, vulnerability, hazard, and risk is everywhere. This paper contributes to the study of disaster-related existing policies in Nepal. The research is based on an extensive literature review and meta-analysis of the existing literature on disaster risk reduction and management. The results revealed that after the state restructuring in 2015, there are several policies either formulated or in the process of formulation. The Constitution of Nepal (2015) has stipulated that DRM is a shared responsibility of all levels of government including federal, provincial, and local levels. Precisely, before 1982, disaster management activities were carried out in an unorganized way. Importantly, it is also highlighted that the Disaster Risk Reduction and Management Act 2017 is the milestone in the DRRM section in Nepal. One of the key aspects of the DRRM Act 2017 is the provision for forming community-based Disaster Preparedness and Response Committees. Thus, th...

Water Quality in the Third Pole, 2020

Abstract The “Third Pole,” centered on the Tibetan Plateau, is also known as the “Water Tower of ... more Abstract The “Third Pole,” centered on the Tibetan Plateau, is also known as the “Water Tower of Asia.” The Third Pole region feeds more than 10 large rivers (e.g., the Yellow River, the Yangtze River, the Yarlung Tsangpo, the Indus, the Amu Darya, etc.) in Asia and there are more than one billion people dependent on the water resources provided by these river basins. In this chapter, an overview of the water chemistry and the geochemical mechanisms that govern the characteristics of major ions and trace elements in rivers of the Third Pole are presented. In general, most rivers of the Third Pole have an alkaline water environment with an average pH of 8.7. As a result of intensive rock weathering within the catchments, the averaged total dissolved solids (~380 mg L−1) in the rivers of the Third Pole are much higher than the global median level. It was found that the dissolved contents in rivers of the Third Pole are dominated by Ca2+, Mg2+, HCO3−, Cl−, and SO42− with a spatial heterogeneity due to the different climates, hydrography, and geology conditions over the region. The main mechanisms that control the water chemistry in the rivers of the Third Pole are natural processes, such as rock weathering, ground discharge, and evaporation-crystallization, and most of the rivers remain pristine. However, it should be noted that due to human factors, such as urbanization and mining operations, toxic elements such as As, Cd, Hg, Mn, and Pb concentrations in some of the rivers in the Third Pole are higher than the permissible limits for drinking water as established by the WHO. With increasing anthropogenic activities and changes within the river basins of the Third Pole, further monitoring of the hydrochemical compositions in rivers over this eco-fragile region is warranted.