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A calculation method and water level technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of not considering the water level change, the small weight of lake organisms and ecosystems, etc.
Active Publication Date: 2016-08-17
INST OF AQUATIC LIFE ACAD SINICA
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Problems solved by technology
The above method has two main shortcomings. One is that the calculation is mostly based on hydrological data, and the weight of lake organisms and ecosys
Method used
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Embodiment 1
[0034] A method for calculating the ecological water level of a lake, the calculation steps are as follows:
[0035] Step 1: Ecological water level value (W germ )calculate
[0036] 1-1: Find or establish the lake water level-area relationship F A～W ;
[0037] 1-2: Calculate the given water level (W give ) Germination area of hygrophytes and emergent plants (A e ), the range of this area is W give -0.2m~W C , W C is the average water level of the lake for many years. For example: the average water level of a lake for many years is 20.0m, and the corresponding lake surface area is 100km 2 , when the calculated water level is 19.0m, the germination distribution elevation range of hygrophytes and emergent plants is 18.8-20.0m. According to the water level-area relationship, the W give -0.2m and W C into F A～W , calculate the difference between the two, that is, A at a given water level e value;
[0038] 1-3: Calculate the germination area of submerged plants (A ...
Embodiment 2
[0058] Calculation of the ecological water level of a lake in Hubei, the steps are as follows:
[0059] Step 1: Ecological water level value (W germ )calculate
[0060] 1-1: Find or establish the lake water level-area relationship F A～W ;
[0061] After consulting the data, the lake water level-area relationship is obtained as the following equation (F A～W ): A=-0.2811W 4 +20.862W 3 -582.37W 2 +7267.9W-34015 (14.0≤W≤20.0), where A is the area (unit: km 2 ), W is the water level (unit: m);
[0062] 1-2: Calculate the given water level (W give ) Germination area of hygrophytes and emergent plants (A e ), the range of this area is W give -0.2m~W C , W C is the average water level of the lake for many years. According to the water level-area relationship, the W give -0.2m and W C into F A～W , calculate the difference between the two, that is, A at a given water levele value;
[0063] According to the data, the annual average water level of the lake is 19.0m, and...
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Abstract
The invention discloses a calculation method of a lake ecological water level. The calculation method comprises the following steps: 1, calculating the water level value of a germination stage: A, finding or establishing a lake water level-area; B, calculating the area of a germination region of hygrophytes and emergent aquatic plants under a given water level; C, calculating the germination area of submerged plants; D, calculating the area of a germination region of aquatic plants; E, calculating the coverage degree of the hygrophytes and emergent aquatic plants and the submerged plants under the given water level; F, calculating the total area of the germination regions of the aquatic plants under different water levels according to step sizes; G, using a water level-vegetation coverage degree relation; 2, calculating the ecological water level value of a seedling growth period; 3, calculating the ecological water level values of growth and diffusion periods; 4, calculating the ecological water level value of a mature period; 5, calculating the ecological water level value of a seed dispersal period; 6, calculating the water level value of a dormancy period; 7, calculating a lake ecological water level hydrograph. The calculation method is simple in calculation process and parameters, and can be widely used in evaluation of ecological water levels of shallow lakes in subtropical areas.
Description
technical field [0001] The invention relates to the fields of lake water resources management and lake ecological restoration, and more specifically relates to a lake ecological water level calculation method with aquatic vegetation as the management target, which is suitable for the management of shallow lake ecological water levels, ecological restoration and ecosystem protection in subtropical regions. Background technique [0002] Ecological water level assessment is an important problem facing lake water resources management and ecosystem protection and restoration. At present, there are three main types of calculation methods used in the world: 1) Hydrological data method, based on the Q95 method in hydrology th The lowest ecological water level of the lake is calculated by the method, or the lowest water level for many years is taken as the lowest ecological water level; 2) The morphological analysis method uses the lake area as the functional index, and in the water l...
Claims
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Application Information
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