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Surface Water
Changes in land use and land cover and establishment of SCS runoff Curve Number in Suddagedda basin – A research report by National Institute of Hydrology
Posted on 24 Jun, 2010 11:52 PMThe study was taken up as a part of the representative basin studies being done by NIH and involved hydrological land use & land cover mapping for the Suddagedda basin of Andhra Pradesh. Mapping was carried out through visual interpretation for the years December 1987, April 1989, December 1992 and November 1996 using IRS IB-LISS II, LANDSAT 5-TM and IRS IC-LISS III data.
Land use and land cover are the most important surface characteristics of a basin. They are very dynamic features over space and time and it is difficult to get real time information on them through conventional means. Planners need to update knowledge of natural resources, which can be obtained quickly, economically and accurately through remote sensing techniques. Further, the land use map of a basin or region provides hydrologically significant categories, which are essential for estimation of reliable runoff from ungauged basins.
Geomorphological study of Devak basin - A research report by National Institute of Hydrology
Posted on 24 Jun, 2010 11:49 PMThe study attempts to find out the effects of geomorphology on watershed runoff response in the Devak basin and tries to identify the parameters that are more closely related to runoff. A chief objective of the study is to regionalize the hydrologic models describing the rainfall-runoff process.
The advanced knowledge of geomorphology of the region is of importance in the field of flood control measures and engineering projects, since geomorphological characteristics of river basins in mountainous areas affect runoff processes and formation of floods in the areas.
Hydrological soil classification of Suddagedda basin - A research report by National Institute of Hydrology
Posted on 24 Jun, 2010 11:27 PMThe study undertakes hydrological soil classification of Suddagedda basin of Andhra Pradesh based on field and laboratory experiments on the soil samples. The hydrologic soil properties of an area are essential to accurately estimate the runoff generated due to storm in the area. The main soil parameters generally considered for analysis are soil texture, soil structure, infiltration rate and hydraulic conductivity.
Rainfall-runoff modeling of Western Ghat region of Karnataka - A research report by National Institute of Hydrology
Posted on 24 Jun, 2010 11:17 PMThe study develops a regional conceptual catchment water balance model for five catchments in the Western Ghat region of Karnataka. The model can be used to estimate the water yield from ungauged catchments located in the region.
The water yield is an integration of discharge as a function of time for a specified duration and reflects the volumetric relationship between rainfall and runoff. The estimation of water yield is required for solution of water resources problems normally encountered in design of storage facilities. It is of use in understanding the water availability for agriculture, industrial and drinking purpose as also for estimating the dependable water supply for power generation and irrigation projects.
Computation of water surface profile using HEC river analysis system - A research report by National Institute of Hydrology
Posted on 24 Jun, 2010 11:15 PMThe study uses HEC-RAS to analyse the water surface profiles of Malaprabha river system upto Khanapur for different combinations of discharges through various reaches of the river system. The river system is divided into eleven reaches, and forty one cross sections have been measured and interpolated within these reaches.
Discharge values have been assigned for different reaches according to the ratio of contributing area for each reach. The bridge across the river at Khanapur is reproduced in the modeling system to test its capabilities. Various return period floods have been allowed to pass through the river system to compute the individual water surface profiles.
Geomorphological and land use planning for Danda watershed - A research report by National Institute of Hydrology
Posted on 24 Jun, 2010 11:13 PMThe study attempts to quantify geomorphological characteristics, generate various thematic databases in Geographic Information Systems (GIS) format and derive landuse information using remote sensing digital data for the Danda watershed in the Tehri-Garhwal district of Uttarakhand. Based on these it develops a land capability classification and generates alternate land use plan.
An integrated approach is followed wherein remote sensing and Geographical Information systems (GIS) techniques have been utilized for evaluation of the catchment characteristics such as geomorphology, landuse, soil and slope. The linking of the geomorphological parameters with the hydrological characteristics of the basin provides a simple way to understand the hydrologic behavior of the basin.
Sediment yield estimation for Lower Satluj basin - A research report by National Institute of Hydrology
Posted on 23 Jun, 2010 11:43 PMThe study develops a relationship between suspended sediment load and discharge for three basins - Kasol, Suni and Lower Satluj. The sediment load (tonnes/ year) and sediment yield (tonnes/ sqkm/ year) in suspension and as bed load of sand & gravel through the river channel, reflects upland erosion in the drainage basin and deposition of sediments in the alluvial bottomlands. A good deal of the sediment eroded from upland areas is deposited on lower hills slopes, in bottomlands, lakes and reservoirs.
Capacity evaluation of Bhakra reservoir using digital analysis of satellite data - A research report by National Institute of Hydrology
Posted on 23 Jun, 2010 10:48 PMThe study assesses sedimentation rate, water spread area and volume of the Bhakra reservoir in Satluj basin using remote sensing data of IRS-1B satellite and LISS-II sensor data of the years 1988-89 and 1996-97. The original elevation-area capacity curves and the reservoir levels on the eight dates of pass of the satellite were obtained from the Bhakra Beas Management Board, Nangal.
Using the trapezoidal formula, the capacity in between the maximum (513.904 m) and minimum (450.436 m) observed levels was assessed for the year 1996-97. The loss of capacity till 1988-89 was 491.315 mcum and till 1996-97 was 807.354 mcum. These could be attributed to the sediment deposition in the zone of study of reservoir.
Estimating hydrological parameters for water balance studies in Tambarapani river basin - A research report by National Institute of Hydrology
Posted on 23 Jun, 2010 10:35 PMThe study develops a water balance of a sub-basin, Pachaiar, of the Tambarapani river basin in Tamil Nadu. The various components of water balance have been estimated by using the process generating module of Simulator for Water Resources in Rural Basins (SWRRB), a model developed by the United States Department of Agriculture (USDA).
The performance of the USDA model has been validated internationally by various researchers. Since the model required continuous weather data, a time series of it has been generated using another model. The efficiency of this model has been checked with a meteorological station outside the basin.
Precipitation network design for Myntdu-Leska basin in Meghalaya - A research report by National Institute of Hydrology
Posted on 23 Jun, 2010 10:23 PMThe study develops a precipitation network design for the Myntdu-Leska basin, which lies near Cherrapunji, the zone of highest rainfall in the world. Network design offers an estimation of the number and location of the rain gauge stations to provide adequate information regarding rainfall falling over the catchment.