Sediment Load Concentration and Resultant Channel Planform in the Lower Gandak Plain

Erosion, transportation and deposition by running water are closely related and these works are performed in association and not in isolation. One cannot be performed without others. These works are determined on other factors like topography, geology, structure and composition of rocks, slope, amount of water availability and its characteristics, climate etc. Huge catchment area of the Gandak River is lying in the Himalayan mountainous region. This region is receiving good amount of rainfall concentrated in four months of monsoonal period June to September (JJAS). This period has also high temperatures leading to large amount of glacial ice melt. Hence, enormous water is drained off the mountain steep slope. The Himalaya is very young and has fragile rocks and ecosystem. Anthropogenic activities in those areas are primary cause, apart from natural weathering, for generation of more and more shattered materials which are brought by running water downstream much easily. Therefore, highly sediment concentrated water brings large quantity of loads. It is deposited in suitable conditions along its paths in the plain and with flood water. It results the formation of flood plain. According to the erosion and deposition, different types of major and minor features are formed. In other words, water and sediment determine the layout of the plain appearance. In this background, it is attempted to (i) study sediment concentration in discharged water and (ii) illustrate the channel planform of the Gandak River in the plain. To achieve these aims, secondary data has been collected and analyzed. It is expected that this study will help in executing an integrated development plan for the flood affected area of Lower Gandak River Plain. Keywords: sediment load, channel bars, channel planform, meandering, braiding, slope/gradient and channel cutoff.

Comparative Flood Inundation Mapping Utilizing Multi-Temporal Optical and SAR Satellite Data Over North Bihar Region

Floods are investigated to be the utmost frequent and destructive phenomena among all other types of natural calamities worldwide. Thus, flood events need to be mapped to understand their impact on the affected region. The present case study is intended to examine and analyze the flood events occurred in July-August 2019 over the Northern Bihar region situated in Kosi and Gandak river basins. Furthermore, a comparative study was carried out to map the satellite based near real time flood inundation using multi-temporal Sentinel–1A (SAR) and MODIS NRT Flood data (optical and 3-day composite). Optical (MODIS) and Sentinel-1 SAR data were acquired to compare their flood inundation extent and the result shows overestimation in MODIS flood data due to varying spatial resolutions.

HYDROBIOLOGICAL STUDY OF BURHI GANDAK RIVER NEAR URBAN AREA AT SAMASTIPUR (BIHAR)

Hydrobiological studies of Burhi Gandak river were carried out for a period of one year from March, 2019 to February, 2020 at two stations of urban area of Samastipur town, Bihar. The parameters taken included the water temperature, transparency, pH, dissolved oxygen, magnesium, and calcium. These properties were analyzed and compared with standard values recommended by bureau of Indian standards and world health organization. Present investigation was undertaken to ascertain the water quality status of Burhi Gandak river at Samastipur town. The results revealed that there were significant seasonal variations in most of the parameters; water was found to be hard, polluted and not suitable for domestic, agricultural and fish growth.

Prevalence of gastrointestinal helminthes in cattle and buffalo in Samastipur district of Bihar

A total of 366 faecal samples including 225 cattle and 141 buffalo of different age groups were randomly collected and analyzed for presence of gastrointestinal helminthes parasites from five different blocks on both sides of Burhi Gandak River in Samastipur district of Bihar in 2015-16. Among cattle 115 (51.11 %) and among buffalo 88 (62.40%) samples were found positive for different species of gastrointestinal helminthes. The prevalence of trematodes, nematodes and cestodes in cattle were 44, 6 and 8 percent, respectively and in buffalo were 35, 18 and 15 percent, respectively. Mixed infection in cattle and buffalo faecal samples was 6.8% and 5.6%, respectively. 4.40 % cattle and 6.60 % buffalo were severely affected, in which egg count per gram was more than 1600. In 1-90 days age group calves 65.6 % cattle and 90.47 % buffalo were positive.