Synthetic Unit Hydrograph for Un gauged Basin using Geomorphologic Instantaneous Unit Hydrograph GIUH based Nash model

Abstract

Maximum rivers from India are un-gauged, and it is extremely difficult under such newlinecircumstances to conduct research and obtain data for the construction of new and stable newlineWater Resources structures. As time passes, it becomes increasingly necessary to adopt newlinenew technologies. Many decades were spent collecting data with outdated technologies. newlineHowever, thanks to improved technology, the task may now be completed in a fairly short newlineperiod of time. Once the expertise is grasped, the largest survey or data gathering may be newlinecompleted quickly and in a matter of months rather than decades. A lot of research is being newlinedone to make it advance. newlineA detailed literature review was undertaken to determine the cost-effectiveness of several newlinegeomorphological approaches for creating Synthetic Unit Hydrographs for gauged and ungauged catchments, as well as to detect which strategy produces the least amount of newlinemistakes and is the most efficient. newlineThe present study examines one of the most widely used flood hydrograph modelling newlineapproaches for gauged and un-gauged basins. Efforts have been made to produce Synthetic newlineUnit Hydrograph (SUH) with the help of the Nash Model, which has a low relative error newlineand the research is based on the Geomorphological Instantaneous Unit Hydrograph newline(GIUH). Under the suggested methodology forty-one tributaries of Narmada basin were newlineselected from the state of Madhya Pradesh and Gujarat for study purposes. Uri or Uri Wagh newlineRiver, one of the main tributaries of the Narmada River has been found completely ungauged, therefore the data obtained was insufficient to generate Unit Hydrograph. newlineThe Shuttle Radar Topography Mission (SRTM) Image popularly known as Digital newlineElevation Model (DEM) was used as an input. Under the suggested design process many newlinesteps were sequentially followed: DEM fill sink, flow direction, flow accumulation, newlinedrainage network map, ordered drainage map, etc. to achieve various Geomorphological newlinecharacteristics of the streams as output: Stream Order, Total number of streams of a newlinedifferent order, Stre