According to the flow reconstruction method, the natural flow change process of the MRYR without the influence of the TGR is obtained. Then, combined with 34 environmental flow parameters and ecological flow indicators, a variety of flow reconstruction scenarios (Table 4) were set up, and the comparison of each group of scenarios was used to quantitatively evaluate the impacts of the TGR operation and changes in other natural factors on the ecological and hydrological situation.
Different scenarios of flow in the MRYR
| Groups . | Scenarios . | Flow process in the MRYR . |
|---|---|---|
| Group 1 | Q1 | Measured flow process from 1965 to 2002 (Obspre-TGR) |
| Q2 | Measured flow process from 2003 to 2019 (Obspost-TGR) | |
| Q3 | Reconstruction flow process 1965–2002 (Simpre-TGR) | |
| Q4 | Reconstruction flow process 2003–2019 (Simpost-TGR) | |
| Group 2 | S1 | Measured EFC changes |
| S2 | Variation of EFC only under the influence of changes in natural factors | |
| S3 | EFC changes under TGR influence | |
| Group 3 | E1 | Measured changes in ecosurplus and ecodeficit |
| E2 | Variation of ecosurplus and ecodeficit only under the influence of changes in natural factors | |
| E3 | Ecosurplus and ecodeficit changes under TGR influence |
| Groups . | Scenarios . | Flow process in the MRYR . |
|---|---|---|
| Group 1 | Q1 | Measured flow process from 1965 to 2002 (Obspre-TGR) |
| Q2 | Measured flow process from 2003 to 2019 (Obspost-TGR) | |
| Q3 | Reconstruction flow process 1965–2002 (Simpre-TGR) | |
| Q4 | Reconstruction flow process 2003–2019 (Simpost-TGR) | |
| Group 2 | S1 | Measured EFC changes |
| S2 | Variation of EFC only under the influence of changes in natural factors | |
| S3 | EFC changes under TGR influence | |
| Group 3 | E1 | Measured changes in ecosurplus and ecodeficit |
| E2 | Variation of ecosurplus and ecodeficit only under the influence of changes in natural factors | |
| E3 | Ecosurplus and ecodeficit changes under TGR influence |