Geo-hydrological Perspectives of Riverine Flows

Chakraborty, Susanta Kumar

doi:10.1007/978-3-030-53897-2_6

Cited by 4 publications

(2 citation statements)

References 70 publications

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“…The influence of land use on the main river flow is closely related to the function of vegetation as land cover and a source of organic matter that can increase infiltration capacity. Moreover, the vegetation will pretend the surface runoff and increase surface detention and depression storage (surface drift), thereby reducing the amount of river flow (Chakraborty, 2021). Land use has a significant factor in the decline in environmental quality, especially the quality of river waters (Tian et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Reaeration is related to physical factors in water, diffusion of oxygen from the atmosphere, and artificial structures such as bridges, weirs, and reservoirs. These artificial structures can increase the turbulence of river water, which can cause or increase the exchange of oxygen from the atmosphere into the water (Chakraborty, 2021). In addition, increasing the distance causes mixing wastewater with river water which can cause changes in the concentration of its constituents (Ustaoglu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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The Ability of Dissolved Oxygen and Biochemical Oxygen Demand Parameters to Self-purify in the Garang River

2021

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Garang River is administratively located in Semarang Regency, Kendal Regency, and Semarang City. Population growth and the number of community activities around the river can affect the water quality of the Garang River. Wastewater discharged into the Garang River will reduce water quality. The number of pollutants that enter the river changes the quality of river water until it reaches a pollutant level that exceeds the quality standard. The purpose of this study was to determine the self-purification ability of the Garang River using the Streeter-Phelps method based on DO and BOD parameters to obtain an oxygen sag curve for oxygen reduction. There are 3 monitoring stations that are located in the upstream segment of the Garang River. The value of the deoxygenation constant (K) in segment 1 is around 0.340, the reaeration constant (R) is 3.433, and the value of fs = 10.103. While in segment 2. the value of K is 0.335, R is 3.417, and fs is 10.194. It is revealed that segment 1 and segment 2 of the Garang River have not yet experienced optimal natural purification because they are still in the degradation zone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Ability of Dissolved Oxygen and Biochemical Oxygen Demand Parameters to Self-purify in the Garang River

2021

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Flow regulation controls sediment, carbon, and nutrient dynamics across the elevation gradient in the water level fluctuation zone of the Three Gorges Reservoir, China

et al. 2023

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Flood risk assessment in Kogi State Nigeria through the integration of hazard and vulnerability factors

Aladejana,

Ebijuoworih

2024

Discov Geosci

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Annually, Kogi State in Nigeria experiences significant flooding events, leading to serious fatalities, the destruction of livelihoods, and damage to vital infrastructure. This study presents a multi-faceted approach and methodology to generate a state-wide flood risk map by analyzing both flood vulnerability and flood hazard factors. Seven flood hazard factors (drainage length, distance to river, elevation, slope, rainfall, distance from confluence/dam area, and geomorphology) and vulnerability factors (population density, female population, land cover, road length, distance from hospitals, literacy rate, and employment rate) were ranked and weighted based on their contributions to flooding within the state using the Fuzzy Analytical Hierarchy Process (FAHP). From these, the Flood Hazard Index (FHI), Flood Vulnerability Index (FVI), and Flood Risk Index (FRI) were derived. Results showed that Kabba, Idah, Olamabor, Kotonkar, and the southern part of Ajaokuta LGAs exhibit high flood vulnerability due to dense populations, remoteness from roads and critical infrastructure, and considerable distances from healthcare facilities. Likewise, LGAs exhibiting a very high FHI occur along the geographic zones bounded by the confluence of the Niger and Benue rivers, specifically along the Lokoja area, and the Kotonkar, Kogi, Bassa, and Ibaji LGAs. Five flood risk classes—very low, low, moderate, high, and very high FRI classes—occupy 26.82, 31.12, 22.07, 15.26, and 4.71% of the area, respectively. Out of 295 villages, 65 villages are spread across the high flood risk zone. The safest LGAs include Ankpa, Omala, Dekina, Ijumu, Kabba, and Mopa-Muro LGAs.

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Geo-hydrological Perspectives of Riverine Flows

Cited by 4 publications

References 70 publications

The Ability of Dissolved Oxygen and Biochemical Oxygen Demand Parameters to Self-purify in the Garang River

The Ability of Dissolved Oxygen and Biochemical Oxygen Demand Parameters to Self-purify in the Garang River

Flow regulation controls sediment, carbon, and nutrient dynamics across the elevation gradient in the water level fluctuation zone of the Three Gorges Reservoir, China

Flood risk assessment in Kogi State Nigeria through the integration of hazard and vulnerability factors

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