CN-122010308-A - Light compensation and re-suspension double-constraint water level pulse closed-loop submerged community restoration method

CN122010308ACN 122010308 ACN122010308 ACN 122010308ACN-122010308-A

Abstract

The invention relates to the technical field of water treatment and water restoration, in particular to a method for restoring a water level pulse closed-loop submerged community with double constraints of light compensation and re-suspension, which calculates the light compensation depth and determines a target water level zone based on water environment parameters; setting a low water level field planting window, performing a sediment endogenous control procedure and a slow-rise domestication stage in sequence, dynamically updating water environment parameters to correct a target water level zone, superposing water level pulses on a reference operating water level to form a water level curve when a water quality purification characterization parameter deviates from a purification control target threshold set and/or algae risk rises, performing boundary constraint and protection by using a resuspension and endogenous release risk weighting index, and setting pulse parameters according to a rolling period and switching a maintenance water level into a purification maintenance stage to realize full-period operation control. The method provided by the invention can stably promote transparency, inhibit water bloom and promote restoration of submerged communities under the conditions of high disturbance and high endogenous.

Inventors

WANG CUNSHI
ZHANG TINGYU
ZHANG XIAOKE
WANG HUILI
ZHU JIANZHONG

Assignees

安庆师范大学

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. A light compensation and resuspension double-constraint water level pulse closed-loop submerged community restoration method is characterized by comprising the following steps: s1, collecting water area to be purified including water level Transparency and transparency And/or turbidity Illumination of the surface layer And/or underwater light profile Acquiring at least one water quality purification characterization parameter and an endogenous pollution characterization parameter, and setting a purification control target threshold set and an endogenous control threshold set; s2, calculating according to the water environment parameters to determine a target water level zone Is of the light compensation depth of (1) And selecting the water level of the planting window for different stage water level operation Reference operating water level And maintaining the water level ; S3, sequentially executing a low water level field planting window setting, a sediment endogenous control procedure and a slow-rising domestication stage on the water area to be purified, and dynamically updating water environment parameters to correct a target water level zone ; S4, constructing a water level pulse stage comprising a purifying operation boundary of a resuspension risk weighting index and an endogenous release risk weighting index, and judging whether to enter the water level pulse stage; operating at a baseline water level when the water quality purification characterizing parameter deviates from the purification control target threshold set and/or algae risk increases Upper superimposed water level pulse Forming a water level curve And the water level always meets And boundary constraint and protection are carried out by using a resuspension risk weighting index and an endogenous release risk weighting index; s5, constructing comprehensive indexes of water purification operation Comprehensive index with endogenous control In a rolling cycle Setting pulse parameters of the water level pulse stage, and switching the water level to the maintenance water level And entering a purification maintenance stage to realize full-cycle operation control.
2. The water level pulse closed-loop submerged community restoration method according to claim 1, wherein the water quality purification characterization parameter at least comprises chlorophyll Total phosphorus Total nitrogen Dissolved oxygen One or a combination thereof; The endogenous pollution characterization parameters at least comprise overlying water to dissolve inorganic phosphorus Inorganic phosphorus is dissolved in pore water of bottom mud Oxidation-reduction potential of bottom mud-water interface One or a combination thereof.
3. The water level pulse closed-loop submerged community restoration method according to claim 1, characterized in that in step S2, it comprises: Fitting or transparency using exponential decay model Obtaining the light attenuation coefficient of the water body through empirical conversion estimation The method comprises the following steps: obtaining the light attenuation coefficient of the water body through exponential decay model fitting The method comprises the following steps: ; Wherein, the Representing the underwater illumination depth; Using transparency Obtaining the light attenuation coefficient of the water body through empirical conversion estimation The method comprises the following steps: ; Wherein, the Is an experience coefficient; according to the light attenuation coefficient of the water body Calculating the light compensation depth The calculation formula is as follows: ; Wherein, the Compensating the light intensity of the target submerged plant; Based on the light compensation depth Target canopy height Safety margin Determining a target water level zone The method comprises the following steps: Upper limit of Meet the height from the water surface to the target canopy The optical path distance at the top is not greater than Wherein the safety margin Can be taken out Lower limit of Determining by combining shallow water stress, operation safety and engineering boundary conditions; At the target water level Is used for selecting the water level of the planting window for different stage water level operation Reference operating water level And maintaining the water level 。
4. The water level pulse closed-loop submerged community restoration method according to claim 1, characterized in that in step S3, it comprises: the setting of the low water level field planting window comprises that when the water level is the water level of the field planting window Is to maintain the fixed planting window duration Setting a low water level planting window for completing planting source, planting or fixing propagule of submerged plant, and restricting with turbidity As a purification operation constraint in a field planting period; the sediment endogenous control procedure comprises paving and/or adding substrate blocking material and/or substrate stabilizing material before or during the subsequent gradual rising domestication stage or water level pulse stage, and setting consolidation time During the consolidation period The internal limiting water level change rate does not exceed the consolidation limit value To reduce the risk of re-suspension and endogenous release; The slow-rise domestication stage comprises moving water level from planting window water level Adjust to the reference operating water level In the adjusting process, the water level change rate is not more than the domestication limit value And comprises at least one steady-state holding section According to updated transparency at the end of each steady-state hold segment And/or underwater light profile Recalculating the light compensation depth And to the target water level zone And the reference operating water level And correcting to maintain the submerged plant canopy to meet the light compensation constraint.
5. The water level pulse closed loop submerged community restoration method of claim 4, further comprising: When the endogenous pollution characterization parameter or the phosphorus diffusion flux When the endogenous control threshold set is not met, performing a supplemental substrate blocking/stabilizing procedure or extending consolidation duration And suspending entering a water level pulse stage; The phosphorus diffusion flux Using approximation, the expression is: ; Wherein, the Is equivalent diffusion coefficient; To diffuse boundary layer thickness.
6. The water level pulse closed-loop submerged community restoration method according to claim 4, wherein the substrate blocking material comprises a phosphorus control cover layer material, an isolation layer material or a composite structure thereof; the substrate stabilizing material comprises a cure stabilizing material, a flocculation-consolidation material, or a combination thereof, and the consolidation period During which the water level change rate limit value Less than the domestication limit value 。
7. The water level pulse closed-loop submerged community restoration method according to claim 1, characterized in that in step S4, it comprises: turbidity based on-line monitoring And turbidity change rate Is used for constructing a resuspension risk weighting index by normalization quantity weighting And sets an upper limit of permission, the expression is: ; ; Wherein, the Indicating normalized turbidity; Indicating the turbidity change rate after normalization; Are all weight coefficients, and ; Based on the dissolution of inorganic phosphorus by overlying water Inorganic phosphorus is dissolved in pore water of bottom mud Oxidation-reduction potential at bottom mud-water interface Construction of endogenous release risk weighting indicators by normalized quantity weighting of (a) And sets an upper limit of permission, the expression is: ; Wherein, the Indicating normalized overlying water to dissolve inorganic phosphorus; representing the difference value of the normalized sludge pore water-soluble inorganic phosphorus and the overlying water-soluble inorganic phosphorus; representing the oxidation-reduction potential of the normalized sediment-water interface; Are all weight coefficients, and ; When re-suspending risk weighting index Or an endogenous release risk weighting indicator When reaching its upper allowable limit, or turbidity change rate Exceeding a threshold value Entering a protection strategy when in use; the protection strategy at least comprises limiting the water level change rate, reducing the water level pulse amplitude, prolonging the pulse rising/falling process, prolonging the low water level residence time, suspending the water level pulse and restoring to the reference operation water level And performing or enhancing a sludge endogenous control process.
8. The water level pulse closed-loop submerged community restoration method according to claim 1, characterized in that in step S4, it comprises: The re-suspension risk weighting index is used in the whole water level pulse stage Weighting indicators with endogenous release risk All lower than the allowable upper limit thereof to realize disturbance inhibition on algae/attached biological films, reduce shading and promote transparency improvement; The water level curve The expression of (2) is: ; In the formula, Operating water level as reference Water level pulse From parameter sets Definition respectively corresponding to and including pulse amplitude Cycle of Rise time Time of descent High water level residence time And low water level residence time Pulse parameters of (2); The water level pulse Adopts an asymmetric waveform and satisfies the rising time And falling time The ratio is not greater than Or not less than And pulse amplitude Is that Cycle of Is that Low water level residence time Occupy the period of A kind of electronic device 。
9. The water level pulse closed loop submerged community restoration method of claim 8, characterized in that in step S5, it comprises: In a rolling cycle Obtaining coverage of submerged plants Index of community structure The water quality purification characterization parameters and the endogenous pollution characterization parameters, and the comprehensive index of water body purification operation is constructed Comprehensive index with endogenous control ; Comprehensive index of water purification operation The expression of (2) is: ; Wherein, the Representing the normalized transparency; represents normalized dissolved oxygen; representing normalized chlorophyll; 、 Representing normalized total phosphorus and total nitrogen; is a weight coefficient, and ; Endogenous control integrated index The expression of (2) is: ; Wherein, the Indicating normalized overlying water to dissolve inorganic phosphorus; representing the difference value of the normalized sludge pore water-soluble inorganic phosphorus and the overlying water-soluble inorganic phosphorus; Indicating normalized turbidity; is a weight coefficient, and ; Comprehensive index of water purification operation Is mainly aimed at lifting by endogenous control comprehensive index Is improved as constraint target, when the light compensation constraint is satisfied Re-suspension constraint With endogenous constraints Under the condition of (a) and (b), for the parameter set And the reference operating water level Performing rolling setting; 、 respectively the comprehensive indexes of water body purification operation Comprehensive index with endogenous control Upper allowable limit of (2); Comprehensive index for water purification operation Reach the purification target threshold set and endogenous control comprehensive index Reaching the threshold set of the endogenous control target and continuously meeting at least With a rolling cycle When the controller stops the water level pulse and switches the water level to the maintained water level Enters a purge maintenance phase.
10. A system for performing the water level pulse closed loop submerged community restoration method of any one of claims 1-9, characterized by comprising: The water level execution unit is used for adjusting the opening of the gate, starting and stopping/frequency conversion of the pump station and water inlet and outlet of the storage facility so as to realize a target water level curve; The light field and turbidity monitoring unit is used for acquiring surface illumination And/or underwater light profile Transparency and transparency And/or turbidity ; A water quality monitoring unit for obtaining chlorophyll Total phosphorus Total nitrogen Dissolved oxygen At least one or a combination of water quality purification characterization parameters; an endogenous monitoring unit for obtaining the water-coated dissolved inorganic phosphorus Dissolving inorganic phosphorus in pore water Oxidation-reduction potential of bottom mud-water interface An endogenous contamination characterization parameter of at least one of or a combination thereof; Community monitoring unit for obtaining coverage of submerged plant And community structure index ; And the controller is used for receiving the monitoring data of each monitoring unit, executing constraint calculation, risk discrimination and pulse parameter setting, and outputting a control instruction to the water level executing unit.

Description

Light compensation and re-suspension double-constraint water level pulse closed-loop submerged community restoration method Technical Field The invention relates to the technical field of water treatment and water ecological restoration, in particular to a water level pulse closed-loop submerged community restoration method with double constraints of light compensation and resuspension. Background Eutrophication and cyanobacterial bloom induced by the eutrophication are one of typical water environment problems faced by shallow lakes, reservoirs and landscape water bodies. Eutrophication is often accompanied by the decrease of transparency of water, the increase of suspended particles, the aggravation of day and night fluctuation of dissolved oxygen and the structural degradation of an ecological system, and is prominently represented by the decline or even disappearance of submerged plants, and the water is converted from grass-type clear water state to algae-type muddy water state, so that the self-cleaning capability of the water is reduced, and the functions of landscapes and ecological services are weakened. In ecological restoration and water purification engineering, submerged plants play an important role in restoring the clean water state and improving the water quality by constructing underwater habitat, absorbing and fixing nitrogen and phosphorus, inhibiting algae, stabilizing sediment and the like. However, the phenomenon of planting submerged plants, recovering failure and repeated reseeding is common in actual engineering, and the reasons are mainly concentrated in three key bottlenecks, namely, firstly, water bloom and suspended particles cause insufficient underwater illumination, the submerged plants are difficult to cross a light compensation threshold at the initial stage of planting, secondly, shallow water storm disturbance or engineering disturbance causes sediment to be resuspended, the abundance of water column particles is increased, the underwater light environment is further weakened, positive feedback of turbidity, shading and fading is formed, thirdly, even if exogenous load is reduced, the historically accumulated phosphorus in the bottom mud can still maintain higher water phosphorus level through endogenous release, the water quality improvement is not expected, and the endogenous release process can last for a long time, so that the long-term stability of submerged plant recovery is weakened. Aiming at the problems, the prior engineering and patent technology mainly comprises physical measures such as sediment dredging, water diversion flushing, aeration and the like, chemical measures such as flocculation/algae removal/phosphorus fixation material and the like, biological-ecological purification measures with aquatic plants as cores and the like. Wherein, the water level/water depth regulation and control can directly influence underwater illumination, temperature and hydrodynamic conditions, and is widely used for water ecological restoration engineering. For example, the Chinese invention with publication number CN106045053A provides a method for purifying water quality of water with controllable water level and recovering submerged vegetation, which comprises the steps of seeding herba Sonchi Oleracei by lowering water level to below 10cm, adjusting water level to 25-40cm after about 15d, cutting other pioneer submerged plants, and then raising water level to 1-1.2m and further raising water level to above 1.5m to realize colonisation and purification. The scheme embodies the thought of 'staged water level gradient+species configuration', but the water level regulation is more mainly based on preset steps, the quantitative constraint based on transparency/light attenuation and light compensation depth is lacking, meanwhile, the on-line constraint mechanism is lacking for the running risk of 'stormy waves-resuspension-turbidity jump', the control of the endogenous release of the sediment usually depends on external management or general measures, and the reproducible stable purification effect is difficult to realize in shallow water systems with strong disturbance and high endogenous load. For another example, the Chinese invention with publication number of CN104743675A discloses a method for controlling submerged plant growth to treat lake eutrophication, emphasizes that the submerged plant is planted and controlled at a key time point, so that the submerged plant obtains better illumination and water temperature conditions. The method has a certain advantage in terms of engineering operability, but generally takes an empirical period/key node as a main part, is difficult to adapt to the situations of rapid fluctuation of water transparency, frequent resuspension events and dynamic change of endogenous release, and when the water enters a muddy water state and presents high endogenous load, the water depth regulation is not enough to meet the multi-target requirement