Need to understand the long term changes in the release from upstream storages to the intensively cultivated delta.
Normally flows are from July to Feb months only, over the years flow has reduced to Aug to Jan.
flow data is available for a network of 17 gauging stations in delta. how it can be studied ?
any suggested literature ?
Can i do the analysis in Excel ? if not please suggest some software ?
I would suggest you first calculate different parameters (annual values) that describe the flow regime at each station and then analyse their behaviour over time. One basic parameter to look at would be the annual number of zero flow days, but I guess you would also be interested how the annual flow volumes changed etc. You can calculate a whole set of parameters using the IHA software https://www.conservationgateway.org/ConservationPractices/Freshwater/EnvironmentalFlows/MethodsandTools/IndicatorsofHydrologicAlteration/Pages/indicators-hydrologic-alt.aspx
Of course you can do simple analyses in excel (time series plots to get an idea how your data change over time) but if you go to further statistical analyses a software such as minitab, statistica, SPSS, or similar is helpful.
In general, however, it seems you are super-lucky to have a lot of data to analyse!
Hello,
I have a question too.
How we can lag daily river flow for modelling??
for example modelling with GEP
There may be other considerations to include, and check for data availability or possible for development. Changes in rainfall during period of analysis? Changes in land use -- imperveous surfaces increase runoff peaks, reduce base flow. Changes in vegetation type such as pine trees in my vicinity can have ET of 30 inches, hardwoods 20 inches, grasslands 10 inches. Conversion to some species can exert substantial transpiration demand, enough to lower water tables and cause streamflow to decline. Also are there new or increased water uses in watershed, irrigation, wells, demand for water has increased from people, crops, industry, etc. Are gauged streams showing decline or just some of them. Are streams incising or adjusting to change (eroding, degrading, gullying, ditching or canals for drainage, drainage of wetlands). Are upstream releases of stored waters being changed for some reason? Is there increasing water management, storage or retention in dams, ponds? If there are no rainfall, land use, water use, water management or use, stream morphology or other changes, the problem becomes more difficult. It may be a combination of several factors such as those mentioned, producing this change.
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