CN111144716A - Novel river health evaluation method - Google Patents
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- CN111144716A CN111144716A CN201911271192.9A CN201911271192A CN111144716A CN 111144716 A CN111144716 A CN 111144716A CN 201911271192 A CN201911271192 A CN 201911271192A CN 111144716 A CN111144716 A CN 111144716A
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- 230000036541 health Effects 0.000 title claims abstract description 58
- 238000011156 evaluation Methods 0.000 title claims abstract description 20
- 238000012216 screening Methods 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 4
- 230000007774 longterm Effects 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
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Abstract
The invention discloses a novel river health evaluation method, which comprises the following steps: firstly, screening and evaluating ecological indexes of river health according to characteristics of the river and changes of the cascade barrage to the river; secondly, continuously and long-term monitoring the indexes of the screened rivers; thirdly, calculating an index based on the collected data, and determining the change condition of the deviation index of the index after the index is compared with the natural river; fourthly, dividing index grades according to the characteristics of the deviation index; and fifthly, comprehensively evaluating the influence condition of the river health of the cascade barrage. The invention can not only reflect the influence degree of the river under damming through positive and negative deviation index analysis, but also evaluate the health condition of each damming area river reach and provide more accurate research for the health condition of the whole river, thereby providing suggestions for river management.
Description
Technical Field
The invention belongs to the technical field of river research, and relates to a novel river health evaluation method.
Background
In recent years, with the continuous improvement of urban functions, the requirement of urban river regulation on river landscape is higher and higher, the step development of the barrage becomes a great feature of urban river landscape, and the barrage brings economic and social functions and simultaneously has some adverse effects on the ecological system health of rivers, such as the problems of sediment flow reduction, reservoir sedimentation, reservoir water quality deterioration, black water body formation accompanied by odor and the like are gradually obvious. Moreover, the barrage developed in steps has a more serious influence on the health of the river than a single barrage because of the characteristics of accumulation, latency and the like. Therefore, the research on the influence of the development of the cascade barrage on the health of the river ecosystem has important significance on the management of rivers and the development of cities.
The influence of a single cascade reservoir on the health of a river ecosystem is researched more widely, which is mainly reflected in the improvement of river health indexes and evaluation methods, but the influence of continuous cascade dams on the ecological health of the river is less, and particularly, a method for continuously researching the change of the river health by one dam is less.
The health influence of the cascade barrage on the ecological system of the river is mainly reflected in the changes of the hydrologic situation, the water quality condition, the biological indexes and the deposited sediment components, so the standard is an evaluation method aiming at the influence of the cascade barrage on the ecological health of the river. Firstly, screening health indexes which accord with the river according to the characteristics of the river and the influence degree of the cascade barrage on the river, and carrying out long-term dynamic monitoring on the screened indexes; secondly, comparing the collected data with a natural river, and calculating the deviation degree of the river, including positive deviation and negative deviation, wherein the positive deviation refers to that the health index is more beneficial to the health of the river than the natural river section, and the negative deviation refers to that the health index is not beneficial to the health of the river; and finally, constructing an evaluation system, and dividing the index grades according to the deviation degree of each index of the cascade barrage so as to evaluate the overall health condition of the river.
Disclosure of Invention
The invention aims to provide a novel river health evaluation method.
The specific technical scheme is as follows:
a novel river health evaluation method comprises the following steps:
firstly, screening and evaluating ecological indexes of river health according to characteristics of the river and changes of the cascade barrage to the river;
secondly, continuously and long-term monitoring the indexes of the screened rivers;
thirdly, calculating an index based on the collected data, and determining the change condition of the deviation index of the index after the index is compared with the natural river;
fourthly, dividing index grades according to the characteristics of the deviation index;
and fifthly, comprehensively evaluating the influence condition of the river health of the cascade barrage.
Further, when comprehensive health evaluation is carried out, the step damming area monthly measured indexes are compared with monthly measured data of an upstream natural river which is not disturbed by a damming area, the deviation index (formula 1) of the measured index data is used for calculating the indexes of each dam, the grade standard (table 1) of each index is formulated according to the index property represented by the deviation index, then the comprehensive health index (formula 2) of the river is calculated by a weighted average method, finally the grade standard of river health of the river city section is determined by referring to the river health grade divided by the water conservancy part, and the grade standard is divided into ideal conditions, health, sub-health, unhealthy and pathological conditions, wherein the ideal conditions represent that the indexes are close to a reference point or an expected target, and the health, sub-health, unhealthy and pathological conditions respectively represent that the indexes are smaller, moderate, larger and obviously different from the reference point or the expected target.
In the formula: m is the index deviation, p is the measured index value, and n is the value of the reference point.
In the formula: r is a comprehensive health index; wiIs the ithA weight of the index; xiIs the score of the ith index.
Further, determination of the classification level of the deviation index, (1) classification of the water quality index is: according to the division of the quality standard of surface water environment (GB3838-2002), if the DO concentration value is greater than 7.5, the water quality is I-type water quality, and compared with a natural river section, if P is greater than 1, the DO concentration value of the natural river section is greater than that of a dam-building area, and negative deviation is obtained. Conversely, if P <1, the deviation is positive. Similarly, other water quality indexes are graded in accordance with the classification. (2) And (3) dividing the water ecological index grades according to the water pollution types corresponding to the plankton diversity index, wherein the higher the plankton diversity index is, the lighter the represented water pollution type is, the lower the plankton diversity index is, the higher the represented water pollution type is, the P is more than 1, the plankton diversity index representing the natural river section is higher than the dam building area and is negative deviation, and otherwise, the positive deviation is. (3) And (3) dividing the hydrological index grade, wherein the hydrological index has no clear corresponding standard, so that the hydrological index is subjected to correlation analysis on water quality and water ecology, the index with the maximum correlation is taken out, if the significant positive correlation is presented, the hydrological index dividing grade is consistent with the dividing grade of the corresponding index, and if the significant negative correlation is presented, the hydrological index dividing grade is opposite to the dividing grade of the corresponding index.
Compared with the prior art, the invention has the beneficial effects that:
the invention can not only reflect the influence degree of the river under damming through positive and negative deviation index analysis, but also evaluate the health condition of each damming area river reach and provide more accurate research for the health condition of the whole river, thereby providing suggestions for river management.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the specific examples below.
TABLE 1 health index score for river section in damming area
1. Evaluation system and index for river health
The ecological indexes are screened according to the characteristics of the river and the influence degree of the cascade barrage on the river, and quantitative evaluation is carried out, as shown in table 2.
TABLE 2 evaluation index of river health in damming area
1.1 Overall evaluation of the impact of the Cascade barrage on river health
And obtaining a comprehensive evaluation result based on the weighted sum average of all indexes. Table 3 is the river health rating scale.
TABLE 3 damming zone river health rating
| Health grade | Ideal situation | Health care | Sub-health | Unhealthy | Pathological state |
| Value range | 1～0.8 | 0.8～0.6 | 0.6～0.4 | 0.4～0.2 | 0.2～0 |
Examples
10 Tishui river is the first-level branch of yellow river originating from kauyi county Hui mountain, full length 370km, passing through the 10 source along the way, going to the west city area, going eastern through civil union, ledo, Ann san county, watershed area 16120km2The ice and snow melt method belongs to plateau continental climate, the annual average temperature is between 1.1 and 0.3 ℃, ice and snow melt in 4 to 5 months per year, and spring flood is formed. The rainfall is increased in the 7-8 months to form the flood season, the runoff of the 6-9 months accounts for more than 70% of the total runoff of the whole year, and the duration of the flood season is longer.
According to the method, 5 continuous step dams built in a city section of the water river are selected as research objects, wherein the height of a dam body is 2.0-2.5m, the dam length is 50m, the water surface can be stably maintained to form a large continuous water surface in a flood season or a non-flood season, and a good landscape effect is presented; and taking a natural river without artificial interference as a reference object, and studying the influence degree of the 5 step dams on the ecological health of the river in the water river city section one by one in the non-flood season.
According to the characteristics of the river city zone, screening evaluation indexes of river health and displaying the evaluation indexes in Table 4.
Table 4 10 moisture river city section river health evaluation index system
The health index score and the health grade of each barrage are shown in table 5 with reference to the evaluation criteria of table 1.
Table 5 Each river segment damming area river index weighting and scoring
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.
Claims (2)
1. A novel river health evaluation method is characterized by comprising the following steps:
firstly, screening and evaluating ecological indexes of river health according to characteristics of the river and changes of the cascade barrage to the river;
secondly, continuously and long-term monitoring the indexes of the screened rivers;
thirdly, calculating an index based on the collected data, and determining the change condition of the deviation index of the index after the index is compared with the natural river;
fourthly, dividing index grades according to the characteristics of the deviation index;
and fifthly, comprehensively evaluating the influence condition of the river health of the cascade barrage.
2. The new river health evaluation method according to claim 1, wherein the average measured monthly index of the stepped damming area is compared with the average monthly data of the natural river which is not disturbed by the upstream damming area, calculating the indexes of each dam by using the deviation index formula (1) of the measured index data, establishing the grade standard of each index according to the index property represented by the deviation index, then, a weighted average method is used for calculating a comprehensive health index expression (2) of the river, finally, the level standard of the river health of the flashy river city section is determined by referring to the river health level divided by the water conservancy division, and the level standard is divided into an ideal condition, a health condition, a sub-health condition, an unhealthy condition and a sick condition, wherein an ideal condition indicates proximity to a reference point or an expected target, and healthy, sub-healthy, unhealthy, and ill-conditioned indicates minor, moderate, major, and significant differences from the reference point or the expected target, respectively;
in the formula: m is the index deviation degree, p is the index measured value, and n is the value of the reference point;
in the formula: r is a comprehensive health index; wiIs the weight of the ith index; xiIs the score of the ith index.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115343439A (en) * | 2022-10-14 | 2022-11-15 | 广东广宇科技发展有限公司 | Urban inland river basin water quality monitoring method |
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| CN106934559A (en) * | 2017-03-31 | 2017-07-07 | 河海大学 | A kind of assessment indicator system for water project management modernization |
| CN109118101A (en) * | 2018-08-24 | 2019-01-01 | 华北水利水电大学 | A kind of River Health Assessment method suitable for Shelter in South China Cities river |
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- 2019-12-12 CN CN201911271192.9A patent/CN111144716A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN101714193A (en) * | 2009-12-29 | 2010-05-26 | 北京师范大学 | River ecosystem-oriented scheduling function optimization method of power generation reservoir |
| CN105005833A (en) * | 2015-08-20 | 2015-10-28 | 长江水资源保护科学研究所 | Method for evaluating influence of hydropower cascade development on watershed ecology safety |
| CN106934559A (en) * | 2017-03-31 | 2017-07-07 | 河海大学 | A kind of assessment indicator system for water project management modernization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115343439A (en) * | 2022-10-14 | 2022-11-15 | 广东广宇科技发展有限公司 | Urban inland river basin water quality monitoring method |
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Application publication date: 20200512 |