Research Article
An Evaluation of River Health for the Weihe River in Shaanxi Province, China
Table 3
The estimated values of membership degree for evaluation indicator of the Weihe River in Shaanxi Province.
| | Reach | Criterion layer | Indicator layer | Value of membership degree | | Excellent | Good | Moderate | Poor | Sick |
| | LW | Water quality | COD (mg/L) | 0.07 | 0.93 | 0.00 | 0.00 | 0.00 | | NH3-N (mg/L) | 0.00 | 0.68 | 0.32 | 0.00 | 0.00 | | Ecological function | Ratio of wetland area (%) | 0.00 | 0.00 | 0.00 | 0.14 | 0.86 | | Riparian vegetation coverage ratio (%) | 0.00 | 0.49 | 0.51 | 0.00 | 0.00 | | Guaranteed rate of discharge in dry flow season (%) | 0.00 | 0.10 | 0.90 | 0.00 | 0.00 | | Recreation function | Recreation value index | 0.00 | 0.00 | 0.50 | 0.50 | 0.00 |
| | WX | Water quality | COD (mg/L) | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | | NH3-N (mg/L) | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | | Ecological function | Riparian vegetation coverage ratio (%) | 0.00 | 0.58 | 0.42 | 0.00 | 0.00 | | Proportion of fish species (%) | 0.00 | 0.00 | 0.85 | 0.15 | 0.00 | | Guaranteed rate of discharge in dry flow season (%) | 0.00 | 0.00 | 1.00 | 0.00 | 0.00 | | Recreation function | Recreation value index | 0.00 | 0.00 | 0.21 | 0.79 | 0.00 |
| | XL | Water quality | COD (mg/L) | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | | NH3-N (mg/L) | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | | Ecological function | Ratio of wetland area (%) | 1.00 | 0.00 | 0.00 | 0.00 | 0.00 | | Riparian vegetation coverage ratio (%) | 0.00 | 0.53 | 0.47 | 0.00 | 0.00 | | Guaranteed rate of discharge in dry flow season (%) | 0.00 | 0.02 | 0.98 | 0.00 | 0.00 | | Flood control | Variation rate of streambed gradient (%) | 0.00 | 0.79 | 0.21 | 0.00 | 0.00 | | Capacity of flood discharge (%) | 0.00 | 0.00 | 0.00 | 0.83 | 0.17 |
| | LH | Water quality | COD (mg/L) | 0.00 | 0.00 | 0.00 | 0.95 | 0.05 | | NH3-N (mg/L) | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | | Ecological function | Riparian vegetation coverage ratio (%) | 0.00 | 0.86 | 0.14 | 0.00 | 0.00 | | Guaranteed rate of discharge in dry flow season (%) | 0.00 | 0.58 | 0.42 | 0.00 | 0.00 | | Flood control | Variation rate of streambed gradient (%) | 0.00 | 0.00 | 0.00 | 0.10 | 0.90 | | Requirement rate of bankfull discharge (%) | 0.00 | 0.00 | 0.00 | 0.99 | 0.01 |
| | DH | Water quality | COD (mg/L) | 0.00 | 0.00 | 0.17 | 0.83 | 0.00 | | NH3-N (mg/L) | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | | Ecological function | Ratio of wetland area (%) | 0.00 | 0.00 | 0.00 | 0.71 | 0.29 | | Guaranteed rate of discharge in dry flow season (%) | 0.00 | 0.00 | 0.96 | 0.04 | 0.00 | | Flood control | Variation rate of streambed gradient (%) | 0.00 | 0.00 | 0.02 | 0.98 | 0.00 | | Requirement rate of bankfull discharge (%) | 0.00 | 0.04 | 0.96 | 0.00 | 0.00 |
|
|
