Quantitative Assessment of Impact of the Proposed Poyang Lake Hydraulic Project (China) on the Habitat Suitability of Migratory Birds
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Approach for Habitat Suitability Evaluation
2.2.1. Selection of Evaluation Factors
2.2.2. Selection of Typical Wet and Dry Years and Remote Sensing Images
2.2.3. Calculation of the Habitat Suitability Evaluation Factors
2D Hydrodynamic Model
- Mesh partition: The topography of the lake was acquired from a digital elevation model developed in 2010. The shore boundary was defined based on the historical maximum water level recorded in the lake, as shown in Figure 3. Rivers and dish-shaped lakes within the model range were partially encrypted. The unstructured triangular mesh that was developed consisted of 206,970 elements and 106,475 nodes.
- Boundary condition: We considered the discharge hydrograph of 11 main lake inlets of the 5 rivers (Ganjiang, Xiujiang, Fuhe, Rao, and Xinjiang) as the upstream open boundary conditions of the hydrodynamic model and the water level hydrograph in Hukou, which is called the water exchange channel of Poyang Lake and Yangtze River, as the downstream boundary condition. In addition, to account for inflows to Poyang Lake from unmonitored sources other than the eleven main inlets [22], the inflow data were multiplied by a coefficient (1.10) in order to maintain the water balance in the model [13] (achieving inflow approximately equal to the outflow in a simulated hydrological cycle).
- Parameters determination: We used a spatially varying roughness coefficient based on topographical features, ranging from 0.018 in the river zone to 0.028 in the vegetation area of the beach.
- Model validation: The model was verified using water level data from 2010–2011 for the Xingzi, Duchang, Kangshan, Longkou, Tangyin stations in the lake and using discharge data from 2010 for Hukou station. Due to the lack of the measured data of 2011 in Longkou Station and Hukou Station, we only verified the corresponding hydrograph of 2010. The water regimes in Poyang Lake for 2010–2011 were simulated by the established hydrodynamic model. The discharge and water level processes of the hydrological station (Figure 3) in the lake were extracted, and the observations were used to verify the simulation results. According to the Figure 4 and Table 2, the average water level error ranged from 0.09 to 0.40 m, the Nash–Sutcliffe (N–S) coefficient [38] (used to verify the quality of the hydrological and hydrodynamic model simulation results) was between 0.909 and 0.990, and the N–S coefficient of Hukou Station was 0.926. The average discharge error was 741.79 m3/s. As such, the hydrodynamic model built in this study had good precision and could be used for later calculations.
RS and GIS
Correction of Evaluation Factors
- For the southern region (from the entrance of the five rivers to the PLHP (Figure 3): The corresponding hydrodynamic model simulation results of scenes with the PLHP were used to correct the landscape classification results and vegetation cover results of remote sensing images without the PLHP. For the results of landscape classification, the hydrodynamic model was used to simulate water depth to correct the deep and shallow water areas in the remote sensing images, but the rest of the area was unchanged. For the results of vegetation coverage, the vegetation coverage on the water surface was assigned a value of 0 by the water surface simulated by the hydrodynamic model, but the rest of the area was unchanged.
- For the northern region (from the location of the PLHP to Hukou Station (Figure 3): In the hydrodynamic model, the PLHP downstream water level processes of S1 and S2 were compared with those of S3 and S4, respectively, and the difference in water level process was minimal. Therefore, the landscape classification and vegetation coverage results of S1 and S2 were used as the results of S3 and S4 of those factors, respectively, and they were included in the calculation.
2.2.4. Normalization of the Habitat Suitability Evaluation Factors
2.3. Matter Element Model
3. Results
3.1. Single Factor Evaluation of Habitat Suitability for Migratory Birds
3.2. Comprehensive Evaluation of Habitat Suitability for Migratory Birds
3.3. Impact of the PLHP on Migratory-Bird Habitats in Each Nature Reserves
4. Discussion
4.1. The Local Fishing Way, Namely “Lake Enclosed in Autumn”
4.2. The Increased Unsuitable Area in S3, S4
4.3. Correction and Comparison of the Evaluation Results
5. Conclusions and Suggestions
Author Contributions
Funding
Conflicts of Interest
References
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Target Level | Evaluation Level | Evaluation Standard | Reference | |||
---|---|---|---|---|---|---|
M01 Suitable Level | M02 Less Suitable Level | M03 Less Unsuitable Level | M04 Unsuitable Level | |||
Habitat suitability for migratory birds | c1 duration of floods in the wet season | 90–123 days | 60–90 days | 30–60 days | 0–30 days | |
c2 landscape classification | Shallow water, quagmire | Sparse meadow, mire | Meadow, beach | Deep water | [6] | |
c3 water depth | 0–0.6 m | 0.6–2 m | 2–10, 0 m | 10–Max m | [24,25,28] | |
c4 vegetation coverage | 60%–100% | 45%–60% | 30%–45% | 0%–30% | [29] | |
c5 human activity distance | 1500–Max m | 1000–1500 m | 500–1000 m | 0–500 m | [26] | |
c6 level of nature reserve | National nature reserve | Provincial nature reserve | County-level nature reserve | Non-natural reserve |
Station Name | Observed Water Level Average/m | Simulated Water Level Average/m | Average Water Level Error/m | Nash–Sutcliffe Coefficient |
---|---|---|---|---|
Xingzi | 11.9 | 12.1 | 0.2 | 0.99 |
Tangyin | 13.32 | 13.43 | 0.09 | 0.95 |
Longkou | 13.68 | 13.83 | 0.15 | 0.982 |
Kangshan | 13.87 | 14.27 | 0.4 | 0.909 |
Duchang | 12.25 | 12.45 | 0.2 | 0.985 |
Suitability Level | S1 | S3 | S2 | S4 | ||||
---|---|---|---|---|---|---|---|---|
Area | Proportion | Area | Proportion | Area | Proportion | Area | Proportion | |
Suitable level | 1456.30 | 48.43% | 1184.10 | 39.37% | 922.5 | 30.67% | 1175.30 | 39.12% |
Less suitable level | 983.4 | 32.70% | 726.5 | 24.16% | 553 | 18.39% | 421.4 | 14.03% |
Less unsuitable level | 411.8 | 13.69% | 718.3 | 23.88% | 1324.10 | 44.03% | 1004.20 | 33.42% |
Unsuitable level | 155.6 | 5.17% | 378.7 | 12.59% | 207.7 | 6.91% | 403.6 | 13.43% |
Suitability Level | S1 | S3 | Change in the Proportion | Effect | |||
Area | Proportion | Area | Proportion | ||||
Suitable level | N | 489.3 | 86% | 386.7 | 69.71% | 16.29% | − |
P | 231.2 | 74% | 166.9 | 53.68% | 20.32% | − | |
C | 350 | 45% | 276.2 | 35.32% | 9.68% | − | |
Less suitable level | N | 62.8 | 11.33% | 57.7 | 10.40% | 0.93% | − |
P | 58.2 | 18.71% | 57.2 | 18.40% | 0.31% | − | |
C | 277.2 | 35.44% | 222.5 | 28.45% | 6.99% | − | |
Less unsuitable level | N | 13.4 | 2.41% | 110.1 | 19.85% | −17.44% | − |
P | 21.6 | 6.94% | 86.6 | 27.85% | −20.91% | − | |
C | 151.4 | 19.36% | 272.7 | 34.87% | −15.51% | − | |
Unsuitable level | N | 0 | 0 | 0 | 0 | 0 | 0 |
P | 0 | 0 | 0 | 0 | 0 | 0 | |
C | 3.6 | 0.46% | 10.7 | 1.37% | −0.91% | − | |
Suitability Level | S2 | S4 | Change in the Proportion | Effect | |||
Area | Proportion | Area | Proportion | ||||
Suitable level | N | 241.3 | 43.51% | 316.9 | 57.15% | −13.64% | + |
P | 135.6 | 43.60% | 166.4 | 53.52% | −9.92% | + | |
C | 284.3 | 36.65% | 355 | 45.39% | −8.74% | + | |
Less suitable level | N | 34.3 | 6.18% | 57.1 | 10.30% | −4.12% | + |
P | 56.8 | 18.26% | 54.5 | 17.53% | 0.73% | − | |
C | 186.9 | 23.89% | 99.3 | 12.70% | 11.19% | − | |
Less unsuitable level | N | 278.2 | 50.16% | 179.5 | 32.37% | 17.79% | + |
P | 118.4 | 38.07% | 89.5 | 28.79% | 9.28% | + | |
C | 304.5 | 38.93% | 314.2 | 40.17% | −1.12% | − | |
Unsuitable level | N | 1 | 0.14% | 1 | 0.14% | 0 | 0 |
P | 0 | 0 | 1 | 0.14% | -0.14% | − | |
C | 6.5 | 0.83% | 13.6 | 1.74% | -0.91 | − |
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Yao, S.; Li, X.; Liu, C.; Yuan, D.; Zhu, L.; Ma, X.; Yu, J.; Wang, G.; Kuang, W. Quantitative Assessment of Impact of the Proposed Poyang Lake Hydraulic Project (China) on the Habitat Suitability of Migratory Birds. Water 2019, 11, 1639. https://doi.org/10.3390/w11081639
Yao S, Li X, Liu C, Yuan D, Zhu L, Ma X, Yu J, Wang G, Kuang W. Quantitative Assessment of Impact of the Proposed Poyang Lake Hydraulic Project (China) on the Habitat Suitability of Migratory Birds. Water. 2019; 11(8):1639. https://doi.org/10.3390/w11081639
Chicago/Turabian StyleYao, Siyang, Xinyu Li, Chenglin Liu, Dongyang Yuan, Longhui Zhu, Xiangyu Ma, Jie Yu, Gang Wang, and Weiming Kuang. 2019. "Quantitative Assessment of Impact of the Proposed Poyang Lake Hydraulic Project (China) on the Habitat Suitability of Migratory Birds" Water 11, no. 8: 1639. https://doi.org/10.3390/w11081639