Methods for estimating the dynamic flood retention capacity of wetlands

Abstract

A method for estimating the dynamic flood retention capacity of a wetland, executed by a control unit, includes the following steps: retrieving an absolute topographic elevation distribution of a wetland from a database; dividing the wetland into multiple grid areas and mapping these grid areas to the absolute topographic elevation distribution to obtain multiple bottom absolute elevations; identifying a lowest point in the absolute topographic elevation distribution, measuring the height difference between the wetland's water surface and the lowest point using a water level measuring device, and generating a current absolute water level based on the sum of the absolute elevation of the lowest point and the height difference; executing a unit remaining capacity calculation program to obtain the volume of a columnar space extending downwards from each grid area, and based on the described values ​​of the grid areas... The sum of the volumes of the columnar spaces generates a remaining water capacity. The procedure for calculating this unit remaining capacity includes: determining whether the absolute elevation of the bottom is lower than the absolute elevation of the current water level. If so, the volume can be expressed as V = (HFULL - HCL) * A, where V is the volume, HFULL is the absolute elevation of the wetland at full water level, HCL is the absolute elevation of the current water level, and A is the area of ​​the grid region. If not, the volume can be expressed as V = (HFULL - HBL) * A, where V is the volume, HFULL is the absolute elevation of the wetland at full water level, HBL is the absolute elevation of the bottom, and A is the area of ​​the grid region.

Claims

1. A method for estimating the dynamic flood retention capacity of a wetland, executed by a control unit, comprising the following steps: retrieving an absolute topographic elevation distribution of a wetland from a database; dividing the wetland into multiple grid areas and mapping these grid areas to the absolute topographic elevation distribution to obtain multiple bottom absolute elevations; identifying a lowest point in the absolute topographic elevation distribution, measuring the height difference between the water surface of the wetland and the lowest point using a water level measuring device, and generating an absolute elevation of the current water level based on the sum of the absolute elevation of the lowest point and the height difference; executing a unit remaining capacity calculation program to obtain the volume of a columnar space extending downward from each grid area, and obtaining a flood retention capacity based on the sum of the volumes of the columnar spaces of the grid areas, wherein... The remaining capacity calculation procedure includes: determining whether the absolute elevation of the bottom is lower than the absolute elevation of the current water level; if so, the volume table is V=(HFULL-HCL)*A, where V is the volume, HFULL is the absolute elevation of the wetland at full water level, HCL is the absolute elevation of the current water level, and A is the area of ​​the grid area; if not, the volume table is V=(HFULL-HBL)*A, where V is the volume, HFULL is the absolute elevation of the wetland at full water level, HBL is the absolute elevation of the bottom, and A is the area of ​​the grid area; and forming a lookup table by combining a plurality of different absolute elevations of the current water level with a plurality of different flood detention capacities, and storing the lookup table in the database.

2. The method for estimating the dynamic flood retention capacity of wetlands as described in claim 1, further includes an inflow rate estimation procedure, which includes: Mapping the absolute elevation of the current water level at a first point in time to the lookup table yields two adjacent binding points; an interpolation calculation is performed based on these two adjacent binding points to obtain a first flood detention capacity; mapping the absolute elevation of the current water level at a second point in time to the lookup table yields two adjacent binding points; an interpolation calculation is performed based on these two adjacent binding points to obtain a second flood detention capacity, the second point in time differing from the first point in time by a time interval; and calculating the flood detention capacity difference between the first and second flood detention capacities, and generating an inflow rate based on the ratio of the flood detention capacity difference to the time interval.

3. The method for estimating the dynamic flood storage capacity of wetlands as described in claim 2, further includes a full-capacity time estimation procedure, which includes: Map the reference table to the absolute elevation of the current water level at the current time to obtain two adjacent binding points among these binding points; perform an interpolation calculation based on the two adjacent binding points to obtain a current flood detention capacity; and generate a full-capacity estimate time based on the ratio of the current flood detention capacity to the inflow rate.

4. The method for estimating the dynamic flood retention capacity of wetlands as described in claim 3, wherein, The control unit further includes a wireless communication device, and the control unit transmits the information on the water inflow rate and the estimated time to full capacity to a central control platform via the wireless communication device.

5. The method for estimating the dynamic flood retention capacity of wetlands as described in claim 4, wherein, The control unit further includes a display device, which displays the water inlet rate and the estimated time to full capacity.

6. The method for estimating the dynamic flood retention capacity of wetlands as described in claim 5, wherein the control unit has a camera unit to capture dynamic images of the wetland, and the dynamic images are transmitted to the central control platform via the wireless communication device.

7. The method for estimating the dynamic flood retention capacity of wetlands as described in claim 6, wherein, The control unit is powered by green electricity.

8. The method for estimating the dynamic flood retention capacity of wetlands as described in claim 7, wherein the green power is provided by solar power, wind power or hydropower.

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