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What are the commonly used methods for measuring the ecological discharge flow of hydropower stations?
The measurement methods for ecological discharge flow of hydropower stations are mainly divided into the following:
1. Pipeline discharge type on-site environment: The outlet of the hydropower station is discharged through a pipeline, usually requiring the construction of a dedicated pipeline for discharge flow, and the appropriate pipe diameter is determined according to the discharge flow demand.
. Measurement method: Directly measure the flow rate using devices such as electromagnetic flow meters or ultrasonic flow meters. Features: High measurement accuracy, relatively easy installation and construction, similar to ordinary water supply pipelines, but limited applicability, not all hydropower stations are suitable for this installation environment.2. Channel discharge type on-site environment: The outlet is connected to the channel, and a measuring weir needs to be manually built to adapt to the irregular shape of the channel.
. Measurement method: The ecological flow is discharged through manual pumping, and the pump head is converted based on the pump power to obtain the discharge flow data. This method determines whether there is a discharge flow by monitoring the current of the water pump, and only needs to monitor the power of the water pump to convert the flow value. Features: Easy installation, low cost; The accuracy is average, the scope of application is small, and continuous power supply to the water pump is required, thus consuming power resources.3. Artificial pumping and discharging on-site environment: Manually pumping and discharging water through a separately i
Fourth, the on-site environment of unit power generation and discharge: using the power generation of the generator set to convert the discharge flow rate, similar to the third type of method.
. Measurement method: Directly monitor the power generation of the unit to calculate the discharge flow data. Simply install a suitable electricity meter and calculate the discharge flow value by taking in the generated power. Features: Easy installation, low cost; The accuracy is average, the scope of application is small, and it is mainly suitable for dam type hydropower stations.Fifth, Gate Opening Discharge Type Site Environment: When the site conditions do not allow for civil construction, sensors can be installed to measure the water level before and after the gate, as well as the gate opening, in order to convert the discharge flow rate.
. Measurement method: The discharge flow rate value is calculated by the telemetry terminal RTU, which has a built-in calculation formula that calculates the discharge flow rate based on the actual collected relevant parameter values.2. Calculation of well water volume
The calculation of well water volume mainly adopts the pumping test method, which directly calculates the water level drop and water output through measurement.
.First, the core calculation formula for well water output (Q) is: Q=S × q-S: water level drop depth (the number of meters the water level drops when pumping is stable) - q: unit water output (the water output corresponding to the water level drops quickly for every meter of drop, in units of m ³/acre of disorderly shed/h
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