CN105868579B - A kind of lake ecological water level computational methods - Google Patents
A kind of lake ecological water level computational methods Download PDFInfo
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Abstract
The invention discloses a kind of lake ecological water level computational methods, its step：1：Germination period water level value calculates：A, search or establish lake level area；B, hygrophyte and emergent aquactic plant under given water level are calculated and sprouts region area；C, calculate submerged plant and sprout area；D, calculate water plant and sprout area's area；E, humidogene and emergent aquactic plant, the coverage of submerged plant under given water level are calculated；F, by step-length, calculate water plant under different water levels and sprout the region gross area；G, water level vegetation coverage relation is utilized；2：Seedling growth stage ecological water place value calculates；3：Growth, diffusion period ecological water place value calculate；4：Maturity period ecological water place value calculates；5：Seed dispersal phase ecological water place value calculates；6：Rest period water level value calculates；7：Lake ecological stage hydrograph.Calculating process and parameter are simple, can be widely applied to subtropical zone shallow lake eco-grounderwater level and assess.
Description
Technical field
The present invention relates to water resources in lake management and ecological restoration of lakes field, be more particularly to it is a kind of using aquatic vegetation as
The lake ecological water level computational methods of management objectives, suitable for subtropical zone shallow lake eco-grounderwater level management, restoration of the ecosystem
And ecosystem protection.
Background technology
It is that the important problem faced is protected and repaired to water resources in lake management and the ecosystem that eco-grounderwater level, which is assessed, at present state
The computational methods used on border mainly have three classes：1) hydrological data method, based on Q95 in hydrologythMethod calculates the minimum life in lake
State water level, or will for many years lowest water level as minimum eco-grounderwater level；2) morphological analysis, using area of lake as functional parameter,
In water level-area curve, minimum eco-grounderwater level is used as using water level corresponding to area of lake rate of change maximum；3) it is biological
Minimum space demand method, minimum eco-grounderwater level is determined to the demand of living space with lake different kind organism.The above method is present
Two it is main the shortcomings that, when calculate it is more be based on hydrological data, lake is biological and the weight very littles of ecosystem demand；Second, with
Calculate the process for based on the minimum eco-grounderwater level in lake, not considering SEA LEVEL VARIATION.The present invention is used as ecosystem using lake aquatic vegetation
The representative monoid of system, using different period history of life vegetation developments to the demand of water level as standard, calculate different vegetation coverage mesh
Lake ecological stage hydrograph under mark.Using the water level demand of lacustrine plant as core, the eco-grounderwater level drawn is one for invention
Graph, calculating process and parameter are simple, can be widely applied to subtropical zone shallow lake eco-grounderwater level and assess.
The content of the invention
It is easy to implement the method it is an object of the present invention to provide a kind of lake ecological water level computational methods, it is easy to operate, it is accurate to calculate not
With water level process corresponding to vegetation coverage, provided reliably for water resources in lake management, eco-grounderwater level regulation and control and restoration of the ecosystem
Technical support, response of the water plant to SEA LEVEL VARIATION are most sensitive；Basis necessary to water plant provides for other aquatic animals
Condition, such as food, habitat, breed place；Revegetation is the important goal and performance assessment criteria that lake is repaired；Covered with vegetation
Cover degree is index, is easy to tracking and monitoring；Water plant can form the natural landscape of grace, and its aesthetic values is easy to by public understanding
And receiving.
In order to realize above-mentioned purpose, the present invention uses following technical measures：
The technology of the present invention is conceived：1) according to Subtropical Chinese lake water plant life history characteristics, it is classified as germination period (2-
March), seedling growth stage (the 4-5 months), growth diffusion period (the 6-7 months), the maturity period (the 8-9 months), the seed dis persal phase (the 10-11 months), stop
The dormancy phase (December-January next year)；2) establish germination period water level and the relation of region area can be sprouted, seek the given vegetation coverage of calculation
Under water level value；3) so according to seedling growth stage, growth diffusion period, the maturity period, the seed dis persal phase, rest period plant water level
Demand calculates the water level range in the period；4) different times ecological water place value is connected into a graph, be the lake to
Determine the eco-grounderwater level graph under vegetation coverage.
A kind of lake ecological water level computational methods, its step are as follows：
Step 1：Germination period (the 2-3 months) ecological water place value (Wgerm) calculate：
1-1：Search or establish lake level-area relationship FA~W；
1-2：Calculate given water level (Wgive) under hygrophyte and emergent aquactic plant sprout region area (Ae), the regional extent
For Wgive- 0.2m~WC, WCFor lake mean annual water level.According to water level-area relationship, by Wgive- 0.2m and WCBring into respectively
FA~W, the difference calculated between the two is sought, is the A under given water leveleValue；
1-3：Calculate submerged plant and sprout region area (As), the region water level range is Wgive- 0.2m~Wgive- 2SD,
SD is the 3-6 months minimum moon transparency, can refer to 1 year transparent degrees of data.According to water level-area relationship, by Wgive- 0.2m and
Wgive- 2SD brings F into respectivelyA~W, the difference calculated between the two is sought, is the A under given water levelsValue；
1-4：The region gross area (A can be sprouted by calculating water plantt), At=Ae+As；
1-5：Calculate the coverage that humidogene is overall with emergent aquactic plant, submerged plant and water plant under given water level
(C, %), very humidogene and water vegetation coverage Ce=Ae/AC× 100%；ACFor water surface face corresponding to the mean annual water level of lake
Product；Submerged vegetation coverage Cs=As/AC× 100%；Water plant collective coverage C=At/AC× 100%；
1-6：By 0.1m step-lengths, repeat step 1-2~1-5, given water level W is calculated respectivelyL、WL+0.1m、WL+0.2m…WC
Lower water plant sprouts the region gross area and total coverage, WLFor lowest water level over the years, water level-vegetation coverage relation is established
FC~W；
1-7：Using water level-vegetation coverage relation, the given vegetation coverage target (C of calculation is soughttarg) under germination period it is most suitable
Ecological water place value (Wgerm).Given vegetation coverage target (Ctarg) it is lake management target；
Step 2：Seedling growth stage (the 4-5 months) ecological water place value (Wgrow) calculate：
4-5 month seedling growth stages should keep stable level and slowly go up, and amount of increase must not exceed 0.4m monthly, therefore April gives birth to
State water level optimum range is Wgerm~Wgerm+ 0.4m, May, eco-grounderwater level optimum range was Wgerm~Wgerm+0.8m；
Step 3：Growth, diffusion period (the 6-7 months) ecological water place value (Wdisp) calculate：
Keep stable level June and slowly go up, amount of increase must not exceed 0.4m monthly, and its eco-grounderwater level optimum range is
Wgerm~Wgerm+1.2m；July, water level needed to go up, but amount of increase must not exceed at the top of emergent aquactic plant, i.e. the 0.5m/ months, therefore ecological water in July
Position optimum range is Wgerm+(WC-Wgerm)/2~Wgerm+2.5m；Such as (WC-Wgerm)/2 >=2.5, then it is Wgerm+ 1.3m~Wgerm+
2.5m；
Step 4：Maturity period (the 8-9 months) ecological water place value (Wmatu) calculate：
8-9 month water levels need to go up to flood hygrophilous vegetation region, prevent terrestrial plant invasion and lakes and swamps, ecology
The low value of water level need to be more than or equal to mean annual water level, and peak is no more than lake warning line (Wwarn), therefore maturity period life
State water level optimum range is WC~Wwarn；
Step 5：Seed dispersal phase (October-November) ecological water place value (Wseed) calculate：
Seed dispersal phase water level need to be gradually reduced according to natural water level fluctuation pattern, October water level with keeping July always,
November, water level was with being consistent June.October, eco-grounderwater level optimum range was Wgerm+(WC-Wgerm)/2~Wgerm+2.5m；Such as (WC-
Wgerm)/2 >=2.5, then it is Wgerm+ 1.3m~Wgerm+2.5m；November, eco-grounderwater level optimum range was Wgerm~Wgerm+1.2m；
Step 6：Rest period (December-January next year) ecological water place value (Wwint) calculate：
Rest period lowest water level need to be consistent with germination period, and the suitable amplitude of peak level is consistent with water level in May.12
The January moon-next year, eco-grounderwater level optimum range was Wgerm~Wgerm+0.8m；
Step 7：Lake ecological stage hydrograph (Winte)：
Each period ecological water place value is connected, forms eco-grounderwater level graph W under given aquatic vegetation coverage targetinte
=Wgerm+Wgrow+Wdisp+Wmatu+Wseed+Wwint；When vegetation coverage target changes, according to above-mentioned calculation procedure again
Calculate eco-grounderwater level graph.
FA~WFor lake level-area relationship；ACFor lake for many years, more than 25 years, water surface area corresponding to mean water,
(unit：km2)；WCFor lake mean annual water level (unit：m)；WLLake lowest water level over the years since for own water-stage record
(unit：m)；WgiveIt is the water level value (unit specified in calculating process to give water level：m)；WwarnIt is (single for lake warning line
Position：m)；SD is the minimum moon transparency (unit of 3-6 month lake water：m)；AeIt is (single for hygrophyte and emergent aquactic plant distributed areas area
Position：km2)；AsFor submerged plant distributed areas area (unit：km2)；AtFor the water plant distributed areas gross area (unit：
km2)；CeFor humidogene and very water vegetation coverage (unit：%)；CsFor submerged vegetation coverage (unit：%)；C is water plant
Total coverage (unit：%)；CtargFor given aquatic vegetation coverage target, i.e., the protection target specified in lake management is (single
Position：%)；FC~WFor aquatic vegetation coverage and the relation of water level；WgermFor germination period ecological water place value；WgrowGiven birth to for Seedling Stage
State water level value；WdispTo grow diffusion period ecological water place value；WmatuFor maturity period ecological water place value；WseedGiven birth to for the seed dispersal phase
State water level value；WwintFor rest period ecological water place value；WinteTo give the eco-grounderwater level graph under vegetation coverage target.
The present invention compared with prior art, has advantages below and effect：
A：By water level-vegetation coverage relation, the eco-grounderwater level under different vegetation coverages can be accurately calculated, and calculate
Water level demand of the parameter according to water plant, thus the eco-grounderwater level calculated directly reflects ecosystem situation, compensate for existing
Computational methods do not focus on the defects of biology and ecosystem；
B：Eco-grounderwater level graph is calculated, the limitation that conventional art only calculates minimum eco-grounderwater level is breached, is expected to make lake
Pool eco-grounderwater level management, which reaches, to become more meticulous；
C：Eco-grounderwater level graph can be adjusted according to different management objectives, be advantageous to carry out lake level adaptability
Management, existing computational methods are unable to reach this point, and calculating process and parameter are simple, can be widely applied to subtropical zone shallow water
Lake ecological water level is assessed.
Embodiment
Present invention implementation is described in further detail below.
Embodiment 1：
A kind of lake ecological water level computational methods, its calculation procedure are as follows：
Step 1：Germination period (the 2-3 months) ecological water place value (Wgerm) calculate
1-1：Search or establish lake level-area relationship FA~W；
1-2：Calculate given water level (Wgive) under hygrophyte and emergent aquactic plant sprout region area (Ae), the regional extent
For Wgive- 0.2m~WC, WCFor lake mean annual water level.Such as：Certain lake mean annual water level is 20.0m, corresponding lake
Water surface area is 100km2, it is 18.8- that hygrophyte and emergent aquactic plant, which sprout distribution elevation scope, when calculating water level 19.0m
20.0m.According to water level-area relationship, by Wgive- 0.2m and WCBring F into respectivelyA~W, the difference calculated between the two is sought, is given
A under water leveleValue；
1-3：Calculate submerged plant and sprout region area (As), the region water level range is Wgive- 0.2m~Wgive- 2SD,
SD is the 3-6 months minimum moon transparency, can refer to 1 year transparent degrees of data.According to water level-area relationship, by Wgive- 0.2m and
Wgive- 2SD brings F into respectivelyA~W, the difference calculated between the two is sought, is the A under given water levelsValue；
1-4：The region gross area (A can be sprouted by calculating water plantt), At=Ae+As；
1-5：Calculate the coverage that humidogene is overall with emergent aquactic plant, submerged plant and water plant under given water level
(C, %), very humidogene and water vegetation coverage Ce=Ae/AC× 100%；Submerged vegetation coverage Cs=As/AC× 100%；It is aquatic
Plant collective coverage C=At/AC× 100%；
1-6：By 0.1m step-lengths, repeat step 1-2~1-5, given water level W is calculated respectivelyL、WL+0.1m、WL+0.2m…WC
Lower water plant sprouts the region gross area and total coverage, WLFor lowest water level over the years, water level-vegetation coverage relation is established
FC~W；
1-7：Using water level-vegetation coverage relation, the given vegetation coverage target (C of calculation is soughttarg) under germination period it is most suitable
Ecological water place value (Wgerm).Given vegetation coverage target (Ctarg) it is lake management target, such as：Needed in certain lake management
Aquatic vegetation coverage reaches 40%, now Ctarg=40%.
Step 2：Seedling growth stage (the 4-5 months) ecological water place value (Wgrow) calculate
4-5 month seedling growth stages should keep stable level and slowly go up, and amount of increase must not exceed 0.4m monthly, therefore April gives birth to
State water level optimum range is Wgerm~Wgerm+ 0.4m, May, eco-grounderwater level optimum range was Wgerm~Wgerm+0.8m；
Step 3：Growth, diffusion period (the 6-7 months) ecological water place value (Wdisp) calculate
Keep stable level June and slowly go up, amount of increase must not exceed 0.4m monthly, and its eco-grounderwater level optimum range is
Wgerm~Wgerm+1.2m；July, water level needed to go up, but amount of increase must not exceed at the top of emergent aquactic plant, i.e. monthly, therefore July is ecological by 0.5m
Water level optimum range is Wgerm+(WC-Wgerm)/2~Wgerm+2.5m；Such as (WC-Wgerm)/2 >=2.5, then it is Wgerm+ 1.3m~Wgerm
+2.5m；
Step 4：Maturity period (the 8-9 months) ecological water place value (Wmatu) calculate
8-9 month water levels need to go up to flood hygrophilous vegetation region, prevent terrestrial plant invasion and lakes and swamps, ecology
The low value of water level need to be more than or equal to mean annual water level (WC), peak is no more than lake warning line (Wwarn), therefore the maturity period
Eco-grounderwater level optimum range is WC~Wwarn。
Step 5：Seed dispersal phase (October-November) ecological water place value (Wseed) calculate
Seed dispersal phase water level need to be gradually reduced according to natural water level fluctuation pattern, October water level with keeping July always,
November, water level was with being consistent June.October, eco-grounderwater level optimum range was for Wgerm+(WC-Wgerm)/2~Wgerm+ 2.5m, such as
(WC-Wgerm)/2 >=2.5, then it is Wgerm+ 1.3m~Wgerm+2.5m；November, eco-grounderwater level optimum range was Wgerm~Wgerm+
1.2m；
Step 6：Rest period (December-January next year) ecological water place value (Wwint) calculate
Rest period lowest water level need to be consistent with germination period, and the suitable amplitude of peak level is consistent with water level in May.12
The January moon-next year, eco-grounderwater level optimum range was Wgerm~Wgerm+0.8m；
Step 7：Lake ecological stage hydrograph (Winte)
Each period ecological water place value is connected, forms eco-grounderwater level graph W under given aquatic vegetation coverage targetinte
=Wgerm+Wgrow+Wdisp+Wmatu+Wseed+Wwint；When vegetation coverage management objectives change, according to above-mentioned calculation procedure
Recalculate eco-grounderwater level graph.
After above-mentioned steps, ecological water place value month by month under given aquatic vegetation coverage can be obtained at present and
Optimum range.
The eco-grounderwater level that described lake is applied to any lake calculates.
Embodiment 2：
Hubei lake ecological water level calculates, and its step is as follows：
Step 1：Germination period (the 2-3 months) ecological water place value (Wgerm) calculate
1-1：Search or establish lake level-area relationship FA~W；
Through inspection information, it is below equation (F to obtain lake level-area relationshipA~W)：A=-0.2811W4+
20.862W3-582.37W2+ 7267.9W-34015 (14.0≤W≤20.0), wherein A are area (unit：km2), W is water level
(unit：m)；
1-2：Calculate given water level (Wgive) under hygrophyte and emergent aquactic plant sprout region area (Ae), the regional extent
For Wgive- 0.2m~WC, WCFor lake mean annual water level.According to water level-area relationship, by Wgive- 0.2m and WCBring into respectively
FA~W, the difference calculated between the two is sought, is the A under given water leveleValue；
According to data, it is 19.0m to obtain the lake mean annual water level, and corresponding water surface area is 304.3km2.Given water
Under position such as 17.0m, the water level range of hygrophyte and emergent aquactic plant distribution is 17.0-0.2~19.0m, i.e. 16.8~19.0m；
Bring 16.8 and 19.0 into water level-area equation (F respectivelyA~W), show that corresponding area is 245.3km under 16.8m2, under 19.0m
Corresponding area is 304.3km2, both differences are 59.02km2, hygrophyte and very moisture cloth area under as water level 17.0m
Ae。
1-3：Calculate submerged plant and sprout region area (As), the region water level range is Wgive- 0.2m~Wgive- 2SD,
SD is the 3-6 months minimum moon transparency (m), can refer to 1 year transparent degrees of data.According to water level-area relationship, by Wgive-0.2m
And Wgive- 2SD brings equation F into respectivelyA~W, the difference calculated between the two is sought, is the A under given water levelsValue；
The lake 3-6 months, minimum moon transparency was 1.0m, and the water level range of submerged plant distribution is 17.0-0.2~17.0-2
× 1.0m, i.e. 16.8~15.0m；Equation F is brought into respectively by 16.8 and 15.0A~W, the difference calculated between the two is sought, is given water
A under positionsValue, is 96.46km2。
1-4：The region gross area (A can be sprouted by calculating water plantt), At=Ae+As；
In the case of water level 17.0m, the lake water plant can sprout region gross area At=59.02+96.46, i.e.,
155.48km2；
1-5：Calculate the coverage that humidogene is overall with emergent aquactic plant, submerged plant and water plant under given water level
(C, %), very humidogene and water vegetation coverage Ce=Ae/AC× 100%；Submerged vegetation coverage Cs=As/AC× 100%；It is aquatic
Plant collective coverage C=At/AC× 100%；
In the case of water level 17.0m, the lake humidogene and very water vegetation coverage Ce=59.02/304.3 × 100%, it is
19.4%；Submerged vegetation coverage Cs=96.46/304.3 × 100%, it is 31.7%；Water plant collective coverage C=
155.48/304.3 × 100%, it is 51.1%；
1-6：By 0.1m step-lengths, repeat step B~E, given water level W is calculatedL、WL+0.1m、WL+0.2m…WCUnder aquatic plant
Thing sprouts the region gross area and total coverage, WLFor lowest water level over the years, water level-vegetation coverage relation F is establishedC~W；
Lake lowest water level over the years is 16.0m, and mean annual water level is 19.0m；According to above-mentioned calculation procedure, walked by 0.1m
It is long, aquatic vegetation covering angle value under 16.0-19.0m (16.0,16.1,16.2,16.3 ... 19.0) is calculated, water level vegetation is established and covers
Cover degree relation FC~WFor equation：C=5.1925W2-204.57W+2029.3。
1-7：Using water level-vegetation coverage relation, the given vegetation coverage target (C of calculation is soughttarg) under germination period it is most suitable
Ecological water place value (Wgerm).Given vegetation coverage target (Ctarg) it is lake management target；
Assuming that the management objectives of the current aquatic vegetation in the lake are 30%, according to water level vegetation coverage relation FC~W, draw and sprout
Hair phase water level need to be maintained at 18.0m, i.e. Wgerm=18.0m.
Step 2：Seedling growth stage (the 4-5 months) ecological water place value (Wgrow) calculate
4-5 month seedling growth stages should keep stable level and slowly go up, and amount of increase must not exceed 0.4m monthly, therefore April gives birth to
State water level optimum range is Wgerm~Wgerm+ 0.4m, May, eco-grounderwater level optimum range was Wgerm~Wgerm+0.8m；
In the case of aquatic vegetation coverage target 30%, April, eco-grounderwater level optimum range was 18.0~18.4m, May
Eco-grounderwater level optimum range is 18.0~18.8m；
Step 3：Growth, diffusion period (the 6-7 months) ecological water place value (Wdisp) calculate
Keep stable level June and slowly go up, amount of increase must not exceed the 0.4m/ months, and its eco-grounderwater level optimum range is
Wgerm~Wgerm+1.2m；July, water level needed to go up, but amount of increase must not exceed at the top of emergent aquactic plant, i.e. monthly, therefore July is ecological by 0.5m
Water level optimum range is Wgerm+(WC-Wgerm)/2~Wgerm+2.5m；Such as (WC-Wgerm)/2 >=2.5, then it is Wgerm+ 1.3m~Wgerm
+2.5m；
In the case of aquatic vegetation coverage target 30%, June, eco-grounderwater level optimum range was 18.0~19.2m；
(WC-Wgerm)/2=(19.0-18.0)/2, i.e., 0.5, therefore eco-grounderwater level optimum range in July is 18.5~20.5m；
Step 4：Maturity period (the 8-9 months) ecological water place value (Wmatu) calculate
8-9 month water levels need to go up to flood hygrophilous vegetation region, prevent terrestrial plant invasion and lakes and swamps, ecology
The low value of water level need to be more than or equal to mean annual water level (WC), peak is no more than lake warning line (Wwarn), therefore the maturity period
Eco-grounderwater level optimum range is WC~Wwarn；
The lake warning line is 20.5m, and normal mean water is 19.0m for many years.In aquatic vegetation coverage target 30%
In the case of, August eco-grounderwater level optimum range is 19.0-20.5m, and September eco-grounderwater level optimum range is 19.0~20.5m；
Step 5：Seed dispersal phase (October-November) ecological water place value (Wseed) calculate
Seed dispersal phase water level need to be gradually reduced according to natural water level fluctuation pattern, October water level with keeping July always,
November, water level was with being consistent June.October, eco-grounderwater level optimum range was for Wgerm+(WC-Wgerm)/2~Wgerm+ 2.5m, such as
(WC-Wgerm)/2 >=2.5, then it is Wgerm+ 1.3m~Wgerm+2.5m；November, eco-grounderwater level optimum range was Wgerm~Wgerm+
1.2m；
In the case of aquatic vegetation coverage target 30%, October, eco-grounderwater level optimum range was with being consistent July
18.5~20.5m；November, eco-grounderwater level optimum range was with being consistent June, was 18.0~19.2m；
Step 6：Rest period (December-January next year) ecological water place value (Wwint) calculate
Rest period lowest water level need to be consistent with germination period, and the suitable amplitude of peak level is consistent with water level in May.12
The January moon-next year, eco-grounderwater level optimum range was Wgerm~Wgerm+0.8m；
In the case of aquatic vegetation coverage target 30%, December-January next year eco-grounderwater level optimum range be 18.0~
18.8m。
Step 7：Lake ecological stage hydrograph (Winte)
Each period ecological water place value is connected, forms eco-grounderwater level graph W under given aquatic vegetation coverage targetinte
=Wgerm+Wgrow+Wdisp+Wmatu+Wseed+Wwint；When vegetation coverage target changes, according to above-mentioned calculation procedure again
Calculate eco-grounderwater level graph.
By each period water level range connect, obtain the lake aquatic vegetation reach 30%, it is necessary to eco-grounderwater level scope such as
Following table.
| Month | Eco-grounderwater level (m) |
| January | 18.0-18.8 |
| 2 months | 18.0 |
| March | 18.0 |
| April | 18.0-18.4 |
| May | 18.0-18.8 |
| June | 18.0-19.2 |
| July | 18.5-20.5 |
| August | 19.0-20.5 |
| September | 19.0-20.5 |
| October | 18.5-20.5 |
| November | 18.0-19.2 |
| December | 18.0-18.8 |
Claims (1)
1. a kind of lake ecological water level computational methods, its step are as follows：
Step 1：Germination period 2-3 month ecological waters place value calculates：
A, search or establish lake level-area relationship FA~W；
B, hygrophyte and emergent aquactic plant under given water level are calculated and sprouts region area, the region water level range is Wgive- 0.2m~
WC, according to water level-area relationship, by Wgive- 0.2m and WCBring F into respectivelyA~W, the difference calculated between the two is sought, is given under water level
AeValue；
C, calculate submerged plant and sprout region area, the region water level range is Wgive- 0.2m~Wgive- 2SD, according to water level-face
Product relation, by Wgive- 0.2m and Wgive- 2SD brings F into respectivelyA~W, the difference calculated between the two is sought, to give the A under water levelsValue；
D, calculate water plant and sprout the region gross area, At=Ae+As；
E, the coverage that humidogene is overall with emergent aquactic plant, submerged plant and water plant under given water level, very humidogene and water are calculated
Vegetation coverage Ce=Ae/AC× 100%；Submerged vegetation coverage Cs=As/AC× 100%；Water plant collective coverage C=
At/AC× 100%；
F, by 0.1m step-lengths, repeat step B~E, given water level W is calculated respectivelyL、WL+0.1m、WL+0.2m…WCLower water plant
Sprout the region gross area and total coverage, WLFor lowest water level over the years, water level-vegetation coverage relation F is establishedC~W；
G, using water level-vegetation coverage relation, the most suitable ecological water place value of germination period under the given vegetation coverage target of calculation is sought, is given
It is lake management target to determine vegetation coverage target；
Step 2：Seedling growth stage 4-5 month ecological waters place value calculates：
4-5 month seedling growth stage stable levels simultaneously go up, and amount of increase must not exceed 0.4m monthly, and April, eco-grounderwater level was Wgerm~Wgerm
+ 0.4m, May, eco-grounderwater level scope was Wgerm~Wgerm+0.8m；
Step 3：Growth, diffusion period 6-7 month ecological waters place value calculate：
Stable level and go up June, amount of increase must not exceed 0.4m monthly, and its eco-grounderwater level scope is Wgerm~Wgerm+1.2m；July
Water level goes up, and amount of increase must not exceed at the top of emergent aquactic plant, i.e. monthly, July, eco-grounderwater level scope was W to 0.5mgerm+(WC-Wgerm)/2
~Wgerm+2.5m；
Step 4：The ecological water place value calculating of the month in maturity period 8-9：
8-9 month water levels go up to flood hygrophilous vegetation region, and the low value of eco-grounderwater level is more than or equal to mean annual water level, highest
Value is no more than lake warning line, and maturity period eco-grounderwater level scope is WC~Wwarn；
Step 5：October seed dispersal phase-ecological water place value calculating in November：
Seed dispersal phase water level is gradually reduced according to natural water level fluctuation pattern, October water level with keeping July always, November water
Position is with being consistent June, and October, eco-grounderwater level scope was Wgerm+(WC-Wgerm)/2~Wgerm+2.5m；November eco-grounderwater level scope
It is Wgerm~Wgerm+1.2m；
Step 6：December rest period-ecological water place value calculating in January next year：
Rest period lowest water level is consistent with germination period, and peak level amplitude is consistent with water level in May, December-January next year eco-grounderwater level
Scope is Wgerm~Wgerm+0.8m；
Step 7：Lake ecological stage hydrograph：
Each period ecological water place value is connected, forms eco-grounderwater level graph W under given aquatic vegetation coverage targetinte=
Wgerm+Wgrow+Wdisp+Wmatu+Wseed+Wwint；When vegetation coverage target changes, recalculated according to above-mentioned calculation procedure
Eco-grounderwater level graph；
FA~WFor lake level-area relationship；ACFor lake for many years, more than 25 years, area corresponding to mean water；WCIt is more for lake
Mean annual water (level)；WLTo have had the lake lowest water level over the years since water level record by oneself；WgiveTo give water level；WwarnWarned for lake
Guard against water level；SD is the minimum moon transparency of 3-6 month lake water；AeFor hygrophyte and emergent aquactic plant distributed areas area；AsPlanted for heavy water
Thing distributed areas area；AtFor the water plant distributed areas gross area；CeFor humidogene and very water vegetation coverage；CsPlanted for heavy water
Coated cover degree；C is the total coverage of water plant；CtargTo give aquatic vegetation coverage target；FC~WFor aquatic vegetation coverage
With the relation of water level；WgermFor germination period ecological water place value；WgrowFor Seedling Stage ecological water place value；WdispFor growth diffusion period life
State water level value；WmatuFor maturity period ecological water place value；WseedFor seed dispersal phase ecological water place value；WwintFor rest period ecological water
Place value；WinteTo give the eco-grounderwater level graph under vegetation coverage target.
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