COSH-tool

Quick summary

Developed by: SINTEF Energy Research

Date: 27-11-2018

Type: Tool (computer model)

Suitable for: Mitigating rapid, short-term variations in flow (hydro-peaking operations) in all phases (planning, implementation, maintenance)

Introduction

COSH-Tool is a software written in Python used for quantifying fluctuations in water level and discharge which may occur in rivers subjected to hydropeaking. COSH-Tool was developed at SINTEF Energy as a part of the CEDREN EnviPeak project (Norwegian Research Council, Grant number 193818) with the aim of providing characteristics of hydropeaking events in regulated rivers in order to classify the hydropeaking regimes of rivers. The tool enables the analysis of long time series of water level or discharge by applying an automated processing to the time series. It provides a set of indicators that characterize fluctuations of water level and discharge in rivers and lakes/reservoirs.

Application

COSH-Tool can be applied to any water level or discharge time series provided by measurements (field work) or simulation (numerical modelling). The analysis of the time series with COSH-Tool does not require any coding from the user and is executed through an interface.

Input files: The input file is a water level or discharge time series. COSH-Tool handles time series with typical time step ranging from minute to hour.

Output files: COSH-Tool computes a set of parameters that characterise water level and discharge fluctuations. The parameters can be classified in three categories: 1) magnitude of the variations; 2) timing and rapidity; and 3) frequency. The parameters are listed in Table 1.

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	Parameter	Unit
Magnitude	Flow	m3/s
	Stage	m
	Flow maximum/minimum of a flow increase	m3/s
	Flow maximum/minimum of a flow decrease	m3/s
	Stage maximum/minimum of a flow increase	m
	Stage maximum/minimum of a flow decrease	m
	Flow ratio of a flow increase/decrease	-
Scale of time	Mean rate of flow increase/decrease	m3/(s*h)
	Mean rate of stage increase/decrease	cm/h
	Maximal rate of flow increase/decrease	m3/(s*h)
	Maximal rate of stage increase/decrease	cm/h
	Time of the start/end of a flow increase	hh:mm
	Time of the start/end of a flow decrease	hh:mm
	Duration between a flow increase and a flow decrease	min
	Duration between a flow decrease and a flow increase	min
Frequency	Count of flow increases/decreases per year	-
	Portion of days with n flow increases/decreases per day	-
	Portion of flow increases/decreases during daylight, twilight, darkness	-