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Flow routing model for upper Indus river (Pakistan) Hashmi, Danial
Abstract
For the flow forecasting of the Upper Indus Basin (UIB) Pakistan, it is observed that large quantities of ungauged lateral flows enter many sections of the Indus River system during the monsoon and the snow melt season. The river is steep, flow travel times are short, and the data are currently available only on a mean daily flow basis. There are very few gauging stations and the travel time between them is less than a day, so that standard routing procedures such as the Muskingum method was difficult to apply because of the large amount of ungauged lateral flows entering the main channel. Calibrating the Muskingum model was therefore difficult because of the ungauged lateral flows, and also because the coefficients used in the Muskingum method are a function of routing period and vary considerably when the routing period is less or greater than the travel time. There was a need for a model which could not only route the flows through the Upper Indus reaches but also could link all the sub basins contributing to the Indus flows. The whole UIB is divided into reaches, and a digital computer Link Model is developed which links these reaches and routes the flows through these reaches using the flow routing method developed by Quick and Pipes. The Link Model adds the known lateral flows to the main channel flows and also calculates the ungauged lateral flows if the stream gauging data for the downstream station is known. This Model can easily be interfaced with the UBC Watershed Model, which forecasts the land phase of the flow and the total system of models can be used for flow forecasting of UIB. The routing method adopted is very flexible and easy to calibrate, because the principal feature of the routing method is that the routing coefficients are determined directly from the stage-discharge and area-discharge measurements at the gauging stations, so the method is pre-calibrated before commencing routing, and therefore avoids the problem of accounting for ungauged lateral inflows. The model has been tested on a 400 km segment of the main stem Upper Indus River, which lies above Tarbela dam i.e, between Besham Qila and Kachura gauging stations Fig (5.1). and was found satisfactory. Given the required data the Model can be used in any similar system.
Item Metadata
Title |
Flow routing model for upper Indus river (Pakistan)
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
For the flow forecasting of the Upper Indus Basin (UIB) Pakistan, it is
observed that large quantities of ungauged lateral flows enter many sections of the
Indus River system during the monsoon and the snow melt season. The river is
steep, flow travel times are short, and the data are currently available only on a
mean daily flow basis. There are very few gauging stations and the travel time
between them is less than a day, so that standard routing procedures such as the
Muskingum method was difficult to apply because of the large amount of
ungauged lateral flows entering the main channel. Calibrating the Muskingum
model was therefore difficult because of the ungauged lateral flows, and also
because the coefficients used in the Muskingum method are a function of routing
period and vary considerably when the routing period is less or greater than the
travel time. There was a need for a model which could not only route the flows
through the Upper Indus reaches but also could link all the sub basins contributing
to the Indus flows.
The whole UIB is divided into reaches, and a digital computer Link Model
is developed which links these reaches and routes the flows through these reaches
using the flow routing method developed by Quick and Pipes. The Link Model
adds the known lateral flows to the main channel flows and also calculates the
ungauged lateral flows if the stream gauging data for the downstream station is
known. This Model can easily be interfaced with the UBC Watershed Model,
which forecasts the land phase of the flow and the total system of models can be
used for flow forecasting of UIB. The routing method adopted is very flexible and easy to calibrate, because
the principal feature of the routing method is that the routing coefficients are
determined directly from the stage-discharge and area-discharge measurements at
the gauging stations, so the method is pre-calibrated before commencing routing,
and therefore avoids the problem of accounting for ungauged lateral inflows.
The model has been tested on a 400 km segment of the main stem Upper
Indus River, which lies above Tarbela dam i.e, between Besham Qila and
Kachura gauging stations Fig (5.1). and was found satisfactory. Given the
required data the Model can be used in any similar system.
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Extent |
4634897 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-23
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0050412
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.