Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (3): 389-405.doi: 10.1007/s11442-019-1605-2
• Research Articles • Previous Articles Next Articles
Wei YANG1,2(), Liping ZHANG1, Yanjun ZHANG1,*(
), Zongli LI3, Yi XIAO1, Jun XIA1
Received:
2018-03-01
Accepted:
2018-05-08
Online:
2019-03-25
Published:
2019-03-20
Contact:
Yanjun ZHANG
E-mail:yangweivv@126.com;zhangyj1015@whu.edu.cn
About author:
Author: Yang Wei (1991-), PhD, specialized in numerical simulation of water environment. E-mail:
Supported by:
Wei YANG, Liping ZHANG, Yanjun ZHANG, Zongli LI, Yi XIAO, Jun XIA. Developing a comprehensive evaluation method for Interconnected River System Network assessment: A case study in Tangxun Lake group[J].Journal of Geographical Sciences, 2019, 29(3): 389-405.
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Table 1
Evaluation system of IRSN scheme"
Index categories | Indexes | Units | Implications |
---|---|---|---|
Hydrodynamic evaluation indexes | Mean flow velocity | m/s | Reflecting the water renewable capability and the self-purification ability. |
Maximum flow velocity | m/s | Representing the maximum flow velocity of the lake. | |
Stagnant water ratio | % | The proportion of the stagnant water area (the velocity less than 0.0006 m/s) to the total area. | |
Water quality evaluation indexes | Water quality improvement rate | % | Reflecting the change trend of water quality indexes in lakes. |
Concentration change index | - | Reflecting the improvement of water quality in lakes, and the larger concentration change index is, the better the water quality becomes. | |
Water quality category ratio | % | Reflecting the spatial distribution of water quality before and after water diversion. | |
Water standard exceeding ratio | % | Reflecting the exceeding standard ratio of each pollutant before and after diversion. | |
Socioeconomic indexes | Economic benefits | yuan | Reflecting the environmental benefits of water quality improvement in lakes. |
Costs | yuan | Reflecting the costs incurred in the operation of the project. | |
Net benefits | yuan | It is the difference between economic benefits and costs. The greater the net benefits, the better the water diversion effect. |
Table 2
The calibration parameters in hydrodynamic and water quality model"
Parameter name | Value | Parameter name | Value |
---|---|---|---|
Coriolis force constant | 7.27×10-5 s-1 | Wind resistance coefficient | 0.0012 |
Horizontal diffusion coefficient | 0.5 m2/s | Vertical diffusion coefficient | 0.8 m2/s |
Horizontal eddy viscosity | 8.9 m2/s | Vertical eddy viscosity | 8.9 m2/s |
Roughness | 0.02 | NH3-N degradation coefficient | 0.05 d-1 |
TP degradation coefficient | 0.008 d-1 | TN degradation factor | 0.015 d-1 |
Table 3
The IRSN schemes of the Tangxun Lake group"
Connectivity schemes | Flow discharge (m3/s) | Outlets | Water diversion routes | |
---|---|---|---|---|
From Donghu Lake | From Liangzi Lake | |||
Scheme I | 40 | 0 | Outlet 1, Outlet 2 | Route A, Route B |
Scheme II | 0 | 40 | Outlet 2 | Route C |
Scheme III | 40 | 40 | Outlet 1, Outlet 2 | Route A, Route B, Route C |
Scheme IV | 0 | 40 | Outlet 2, Outlet 3 | Route C, Route D |
Scheme V | 40 | 40 | Outlet 1, Outlet 2, Outlet 3 | Route A, Route B, Route C, Route D |
Table 4
The flow velocity and stagnant water ratio under different schemes"
Schemes | Mean flow velocity (m/s) | Maximum flow velocity (m/s) | Stagnant water ratio (%) |
---|---|---|---|
Before diversion | 0.0015 | 0.0065 | 31.4 |
Scheme I | 0.0051 | 0.483 | 29.9 |
Scheme II | 0.0056 | 0.690 | 24.8 |
Scheme III | 0.0079 | 0.666 | 23.7 |
Scheme IV | 0.0084 | 0.749 | 23.0 |
Scheme V | 0.0087 | 0.743 | 21.6 |
Table 5
Water quality of the Tangxun Lake group before and after IRSN under different schemes"
Schemes | Lakes | Water quality improvement rate (%) | Concentration change index | Water quality category ratio (%) | Water standard exceeding ratios (%) | |||||
---|---|---|---|---|---|---|---|---|---|---|
NH3-N | TN | TP | I~III | IV | V | Worse than Grade V | ||||
Before diversion | TXL | - | - | - | - | 9.18 | 23.78 | 40.38 | 26.66 | 90.82 |
SL | - | - | - | - | 0 | 1.97 | 6.93 | 91.1 | 98.03 | |
Scheme I | TXL | -1.32 | 12.54 | 10.81 | 0.078 | 8.33 | 49.97 | 23.89 | 17.8 | 91.67 |
SL | 31.21 | 38.85 | 55.97 | 0.543 | 4.57 | 62.54 | 16.4 | 16.49 | 32.89 | |
Scheme II | TXL | 16.51 | 31.42 | 30.63 | 0.305 | 46.49 | 28.69 | 13.98 | 10.84 | 53.51 |
Scheme III | TXL | 15.85 | 33.5 | 32.43 | 0.321 | 45.31 | 31.48 | 13.37 | 9.83 | 54.69 |
SL | 31.21 | 38.85 | 55.97 | 0.543 | 4.57 | 62.54 | 16.4 | 16.49 | 32.89 | |
Scheme IV | TXL | 17.17 | 31.32 | 31.53 | 0.311 | 49.41 | 25.28 | 13.51 | 11.79 | 50.59 |
HJL | 21.52 | 14.87 | 51.72 | 0.366 | 6.91 | 15.25 | 43.45 | 34.39 | 93.09 | |
QLL | 2.33 | -1.6 | -62.14 | -0.298 | 21.03 | 19.03 | 29.74 | 30.2 | 78.97 | |
YL | 27.71 | 2.13 | 36.57 | 0.264 | 0 | 33.33 | 50.6 | 16.07 | 66.67 | |
Scheme V | TXL | 16.04 | 32.65 | 31.53 | 0.313 | 47.31 | 28.66 | 12.93 | 11.1 | 52.69 |
SL | 31.21 | 38.85 | 55.97 | 0.543 | 4.57 | 62.54 | 16.4 | 16.49 | 32.89 | |
HJL | 17.63 | 22.97 | 52.47 | 0.388 | 0.04 | 23.91 | 48.32 | 27.72 | 99.96 | |
QLL | 2.37 | -0.85 | -62.03 | -0.295 | 22.52 | 19.07 | 32.03 | 26.38 | 77.48 | |
YL | 27.76 | 2.2 | 36.83 | 0.265 | 0 | 33.35 | 50.57 | 16.08 | 66.65 |
Table 6
Benefits and investments under different schemes"
Schemes | Total flow discharge (m3/s) | Water pollutants (kg) | Economic benefits (×104 yuan) | Costs (×104 yuan) | Net benefits (×104 yuan) | ||
---|---|---|---|---|---|---|---|
NH3-N | TN | TP | |||||
Before diversion | - | 133821.2 | 212388.9 | 18383.1 | - | - | - |
Scheme I | 40 | 119334.1 | 174779.1 | 14984.7 | 203.33 | 117.50 | 85.83 |
Scheme II | 40 | 122782.3 | 167619.4 | 16223.4 | 193.62 | 117.50 | 76.11 |
Scheme III | 80 | 107856.8 | 144923.0 | 13418.5 | 355.11 | 235.01 | 120.11 |
Scheme IV | 40 | 119391.0 | 165971.8 | 14044.5 | 234.05 | 117.50 | 116.54 |
Scheme V | 80 | 105319.4 | 143262.0 | 11252.8 | 390.99 | 235.01 | 155.98 |
Table 7
Comprehensive evaluation results of the five schemes"
Schemes | Hydrodynamic evaluation indexes | Water quality evaluation indexes | Socio-economic index | ||||
---|---|---|---|---|---|---|---|
Mean flow velocity (m/s) | Stagnant water ratio (%) | Water quality improvement rate (%) | Concentration change index | Net benefits (million) | |||
NH3-N | TN | TP | |||||
Scheme I | 0.0051 | 29.9 | 2.85 | 12.66 | 13.57 | 0.114 | 85.83 |
Scheme II | 0.0056 | 24.8 | 10.61 | 20.19 | 19.68 | 0.196 | 76.11 |
Scheme III | 0.0079 | 23.7 | 13.88 | 26.13 | 27.46 | 0.271 | 120.11 |
Scheme IV | 0.0084 | 23.0 | 14.23 | 21.61 | 19.9 | 0.213 | 116.54 |
Scheme V | 0.0087 | 21.6 | 16.78 | 28.02 | 26.62 | 0.281 | 155.98 |
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