Temperature drives the major physico-chemical and biological actions in inland water bodies. The higher the water temperature, the greater the biogeochemical activity influenced by the environmental intrinsic and extrinsic parameters. Temperature also controls the dynamics of sustainability of various aquatic organisms that live in lakes and reservoirs, though higher life forms, such as fish, insects, zooplankton, phytoplankton, and other aquatic species all have a recommended temperature variety. The increase in water temperature due to the increase in atmospheric air temperature results in lake water column stratification and the dissolved oxygen level variation in aquatic systems are greatly affected. The vertical distributions of dissolved oxygen in the water column are highly dependent due to change in vertical temperature gradient. In the present paper, an effort has been made to investigate the impact of temperature stratification on dissolved oxygen variability in the Rudrasagar, a natural lake in western Tripura. The changes in dissolved oxygen distribution in this natural lake will give us an idea of regional lake health condition and will also establish the need of further large scale research concerning the development of a biophysical-coupled model. Keywords: Thermal stratification, Dissolved Oxygen, Thermocline, Rudrasagar Lake, Hypolimnion
The river Gumti, one of the largest rivers of Tripura, is flowing west ward and finally falls into the river Meghna, Bangladesh. The river Gumti is formed by the confluence of two rivulets, named Raima and Sharma, the former originating in the Longtarai Range and the later in the Atharomura Range. From its confluence point the combined flow of the two rivulets is known as the Gumti which flows southward. Before a dam was constructed across the Gumti river, the river used to spill over a series of rapids which are locally known as Dumboor falls. Due to the construction of this dam for hydropower plant a large reservoir is created , known as Dumboor reservoir. In this paper a quantitative assessment of water of Dumboor reservoir has been done for possible use of drinking and Irrigation etc. The hydrologic simulation model has been used using HEC-HMS software for estimating the quantity of water. From the observation of model discharge of the reservoir water, in various seasons during the period 2004-2013, this has been found that minimum discharge is 20.48 m 3 /s during pre monsoon and maximum discharge is 101.73 m 3 /s during monsoon.
Fourier analysis method can be used as a mathematical tool for modelling the diurnal profile of surface air temperature and surface dissolved oxygen (DO) of lake water. For developing the model, initially Lake Rudrasagar, Tripura, India has been chosen as the study site. Within the scope of this communication, due to availability of collected data the developed mathematical model has been verified for Subhas Sarobar, Kolkata. It is observed that the diurnal profile of DO and surface air temperature of both the lakes studied almost follows similar trends of sinusoidal variation.Keywords: Diurnal profile, dissolved oxygen, sinusoidal variation, surface air temperature.ONE-dimensional harmonic analysis with regard to timeseries data has potential applications in oceanography, hydrology 1-4 as well as in geosciences and geology. The two-dimensional extension of harmonic analysis finds significant applications in meteorology and climatology. Fourier analysis may also be termed as spectral analysis which decomposes a new time-dependent regular sensation directly into several sinusoidal features, each of which simply characterized by special amplitude and period valuations. The actual portion involving variance inside initial time-series can be established and every single term of the harmonic analysis can also be worked out. Model designing during the last few years has become a challenging task among researchers and engineers, for scientifically prediction of the future scenario 5 . In hydrodynamics, mathematical simulation has become a vital feature of researches in this regard. In order to generate a mathematical model, experimental data analysis is the fundamental criterion for following the process over the time-space domain. Fourier analysis method has been chosen as the mathematical tool for generating the required model to study the sinusoidal variation of surface air temperature and surface dissolved oxygen (DO) of lakes. Several major physico-chemical characteristics of lake water are controlled by temperature for the Lake Rudrasagar 6 which is in turn responsible for maintaining the lake water quality suitable for human consumption. The progressive variation in air temperature also shows a strong seasonal relationship with lake water temperature 7 . DO concentration regulates the respiration of these organisms. If strong turbulence is not observed in a lake, then photosynthesis by aquatic plants is the only vital source of DO. There exist strong correlations between surface air temperature and surface DO for the lakes Rudrasagar and Subhas Sarobar. Incoming solar radiation may also put a signature on diurnal profile of surface air temperature and surface DO of lake water 8 . The study site, i.e. Lake Rudrasagar (2329N and 9001E) falls in Melaghar Block under Sonamura SubDivision of Tripura, the third smallest state of India. This natural lake is 50 km away from the state capital, Agartala. It has three sources of inflow and one outflow. Inflows are Noacherra, Durlavnarayan cherra and Kemtali cherra, whe...
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