Study on Risk Assessment and Early Warning of Flood-Affected Areas when a Dam Break Occurs in a Mountain River
Abstract
:1. Introduction
2. Study Area
2.1. Dam and Reservoir
2.2. Disasters in Previous Years
2.3. Earthquake Situation
2.4. Evaluation of Dam-Break Flood
2.5. Flood Risk and Its Components
3. Methodology
3.1. Fuzzy Analytic Hierarchy Process
3.2. Combination of FAHP and Analysis of Mountain Rivers
4. Application of FAHP
4.1. Establish Hierarchical Structure Model
4.2. Use AHP to Determine the Weight Vector W
4.2.1. Construct Judgment Matrix
4.2.2. Calculate the Single Ordering Weight Value and Check the Consistency
4.2.3. Solve Weight Vector W
4.3. Use the FSEM to Determine the Judgment Matrix R
4.3.1. Residential Area Data
4.3.2. Criteria for Classification of the Risk Level in Flood-Affected Areas
4.3.3. Quantitative Representation of Judgment Matrix R
4.3.4. Taking Santan Village as an Example to Calculate the Judgment Matrix R
- (1)
- x = 500, b1 = 10, b2 = 50, b3 = 100, b4 = 300, , , ,Fuzzy subset R1 = (r11, r12, r13, r14, r15) = (0, 0, 0, 0.3, 0.7)
- (2)
- When the evaluation factor is flood arrival time (10−a2), according to the data in Table 4 and Table 5:x = 10 − 0.24 = 9.76, b1 = 2, b2 = 4, b3 = 6, b4 = 8, , , ,Fuzzy subset R2 = (r21, r22, r23, r24, r25) = (0, 0, 0, 0.41, 0.59)
- (3)
- x = 147, b1 = 50, b2 = 75, b3 = 100, b4 = 125, , , ,Fuzzy subset R3 = (r31, r32, r33, r34, r35) = (0, 0, 0, 0.43, 0.57)
- (4)
- x = 147, b1 = 50, b2 = 75, b3 = 100, b4 = 125, ,, ,Fuzzy subset R4 = (r41, r42, r43, r44, r45) = (0.67, 0.33, 0, 0, 0)
- (5)
- x = 1.2, b1 = 1, b2 = 2, b3 = 4, b4 = 10Due to , considering Table 6, ,, ,Fuzzy subset R5 = (r51, r52, r53, r54, r55) = (0.3, 0.7, 0, 0, 0)
5. Discussion and Results
5.1. Santan Village
5.2. Panzhihua City Flooded Area
- (1)
- When the evaluation factor is the population (a1):Fuzzy subset R1 = (r11, r12, r13, r14, r15) = (0, 0, 0, 0, 1)
- (2)
- When the evaluation factor is flood arrival time (10−a2):Fuzzy subset R2 = (r21, r22, r23, r24, r25) = (0, 0, 0, 0.48, 0.52)
- (3)
- When the evaluation factor is flood level (a3):Fuzzy subset R3= (r31, r32, r33, r34, r35) = (0, 0, 0, 0.45, 0.55)
- (7)
- When the evaluation factor is evacuation time (a4):Fuzzy subset R4 = (r41, r42, r43, r44, r45) = (0, 0, 0, 0.2, 0.8)
- (5)
- When the evaluation factor is local GDP (a5):Fuzzy subset R5 = (r51, r52, r53, r54, r55) = (0, 0, 0, 0.03, 0.97)
5.3. Other Flood-Affected Areas
5.4. Applications of Study Results
5.4.1. Quxue Hydropower Station
5.4.2. Guanmaozhou Hydropower Station
6. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Digital Scale Value | The Significance |
---|---|
1 | Two elements comparison, with the same importance |
3 | Two elements comparison, the element i is slightly more important than the element j |
5 | Two elements comparison, the element i is obviously more important than the element j |
7 | Two elements comparison, the element i is intensively more important than the element j |
9 | Two elements comparison, the element i is extremely more important than the element j |
2, 4, 6, 8 | Take the average value of the adjacent judgment value |
Reciprocal | If the importance ratio of element i to element j is aij, the importance ratio of element j to element i is aji = 1/aij |
Matrix Order (n) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
RI | 0 | 0 | 0.58 | 0.89 | 1.12 | 1.24 | 1.32 | 1.41 | 1.45 | 1.49 | 1.52 | 1.54 | 1.56 | 1.58 | 1.59 |
aj | a1 | a2 | a3 | a4 | a5 | |
---|---|---|---|---|---|---|
ai | ||||||
a1 | 1 | 5 | 3 | 5 | 7 | |
a2 | 1/5 | 1 | 1/3 | 1 | 3 | |
a3 | 1/3 | 3 | 1 | 3 | 5 | |
a4 | 1/5 | 1 | 1/3 | 1 | 3 | |
a5 | 1/7 | 1/3 | 1/5 | 1/3 | 1 |
Num | Place Name | Population | Flood Arrival Time (h) | Flood Level (m) | Evacuation Time (h) | Local GDP (Million $) |
---|---|---|---|---|---|---|
1 | Santan Village | 500 | 0.24 | 147 | 0.267 | 12 |
2 | Oufangyingdi | 100 | 0.24 | 147 | 0.233 | 8 |
3 | Gantianbao | 200 | 0.60 | 144 | 0.50 | 10 |
4 | Jinhe | 200 | 0.60 | 144 | 0.50 | 26 |
5 | Panzhihua City flooded area | 129,100 | 1.67 | 138 | 2.0 | 1500 |
6 | Xinlong Village | 800 | 2.28 | 133 | 0.267 | 17.6 |
7 | Hepiao Village | 300 | 2.80 | 129.5 | 0.233 | 11 |
8 | Yuzuo | 1000 | 3.12 | 127 | 0.20 | 40 |
9 | Lazuo | 1000 | 3.12 | 127 | 0.233 | 40 |
10 | Lumuzu | 20 | 3.50 | 122 | 0.267 | 3 |
11 | Yishala Ecological zone | 200 | 3.70 | 120 | 0.247 | 11.3 |
12 | Tuoji Factory | 100 | 3.90 | 118.5 | 0.367 | 9 |
13 | Luomodi | 200 | 4.20 | 112 | 0.350 | 25 |
14 | Yimoshidu | 500 | 4.50 | 108 | 0.233 | 19 |
15 | Jiangbian Town | 800 | 4.74 | 106 | 0.40 | 75 |
16 | Bingnong Village | 100 | 5.22 | 103.5 | 0.40 | 9 |
17 | Xikangzhi | 150 | 5.28 | 103 | 0.433 | 14 |
18 | Wande | 200 | 5.28 | 103 | 0.667 | 21 |
19 | Jiangzhu | 200 | 5.64 | 100 | 0.564 | 20 |
20 | Xinshan Village | 150 | 6.10 | 96.2 | 0.530 | 10 |
21 | Xin’an | 200 | 6.36 | 95 | 0.636 | 60 |
22 | Wumushu | 40 | 6.85 | 92 | 0.233 | 3 |
23 | Pulong | 80 | 6.85 | 92 | 0.933 | 12 |
24 | Yituzhuang | 100 | 6.90 | 92.5 | 0.333 | 13 |
25 | Luji | 80 | 7.38 | 93 | 0.20 | 11 |
26 | Longshu | 30 | 7.62 | 91.6 | 0.60 | 16 |
27 | Makou | 40 | 7.78 | 89.5 | 0.8 | 5 |
28 | Wujia Village | 100 | 7.92 | 88.6 | 0.30 | 22 |
19 | Huaizuo | 50 | 8.39 | 85.3 | 0.56 | 6 |
30 | Dalishu | 100 | 8.55 | 84 | 0.43 | 24 |
31 | Luhe Village | 50 | 8.64 | 83.4 | 0.670 | 26 |
32 | Pumie | 50 | 8.82 | 82.7 | 0.187 | 21 |
33 | Yanba | 60 | 9.06 | 81 | 1 | 23 |
34 | Yinmin | 50 | 9.30 | 78 | 0.87 | 34 |
35 | Tuobuka Town | 200 | 9.94 | 74.5 | 0.400 | 60 |
Evaluation Factors and Their Assignment | Population a1 | Flood Arrival Time (10−a2) | Flood Level a3 | Evacuation Time a4 | Local GDP a5 |
---|---|---|---|---|---|
Slight danger | ≤10 | ≤2 | ≤50 | ≤0.4 | ≤10 |
General danger | (10)–50 | (2)–4 | (50)–75 | (0.4)–0.5 | (10)–20 |
Obvious danger | (50)–100 | (4)–6 | (75)–100 | (0.5)–0.6 | (20)–40 |
Intensive danger | (100)–(300) | (6)–(8) | (100)–(125) | (0.6)–(0.8) | (40)–(100) |
Extreme danger | ≥300 | ≥8 | ≥125 | ≥0.8 | ≥100 |
Evaluation Factor Interval | Risk Level | ||||
---|---|---|---|---|---|
I | II | III | IV | V | |
0 | 0 | 0 | |||
0 | 0 | 0 | |||
0 | 0 | 0 | |||
0 | 0 | 0 | |||
0 | 0 | 0 | |||
0 | 0 | 0 | |||
0 | 0 | 0 | |||
0 | 0 | 0 |
Slight Danger | General Danger | Obvious Danger | Intensive Danger | Extreme Danger |
---|---|---|---|---|
0.08 | 0.07 | 0 | 0.3 | 0.55 |
Slight Danger | General Danger | Obvious Danger | Intensive Danger | Extreme Danger |
---|---|---|---|---|
0 | 0 | 0 | 0.18 | 0.82 |
Num | Place Name | Fuzzy Comprehensive Evaluation Set B | Grade | Risk Level |
---|---|---|---|---|
1 | San Tan Village | 0.08, 0.07, 0.00, 0.30, 0.55 | V | Extreme danger |
2 | Oufangyingdi | 0.10, 0.05, 0.25, 0.40, 0.20 | IV | Intensive danger |
3 | Gantianbao | 0.03, 0.08, 0.05, 0.65, 0.20 | IV | Intensive danger |
4 | Jinhe | 0.00, 0.06, 0.09, 0.65, 0.20 | IV | Intensive danger |
5 | Panzhihua City | 0.00, 0.00, 0.00, 0.18, 0.82 | V | Extreme danger |
6 | Xinlong Village | 0.07, 0.07, 0.01, 0.28, 0.57 | V | Extreme danger |
7 | Hepiao Village | 0.09, 0.06, 0.00, 0.46, 0.39 | IV | Intensive danger |
8 | Yuzuo | 0.08, 0.03, 0.03, 0.32, 0.55 | V | Extreme danger |
9 | Lazuo | 0.07, 0.03, 0.03, 0.32, 0.55 | V | Extreme danger |
10 | Lumuzu | 0.23, 0.42, 0.03, 0.23, 0.10 | II | General danger |
11 | Yishala Ecological zone | 0.09, 0.06, 0.04, 0.74, 0.08 | IV | Intensive danger |
12 | Tuoji Factory | 0.08, 0.07, 0.30, 0.50, 0.06 | IV | Intensive danger |
13 | Luomodi | 0.06, 0.06, 0.10, 0.79, 0.00 | IV | Intensive danger |
14 | Yimoshidu | 0.07, 0.06, 0.14, 0.38, 0.35 | IV | Intensive danger |
15 | Jiangbian Town | 0.05, 0.05, 0.15, 0.34, 0.41 | V | Extreme danger |
16 | Bingnong Village | 0.08, 0.08, 0.43, 0.41, 0.00 | III | Obvious danger |
17 | Xikangzhi | 0.02, 0.14, 0.31, 0.53, 0.00 | IV | Intensive danger |
18 | Wande | 0.00, 0.04, 0.23, 0.74, 0.00 | IV | Intensive danger |
19 | Jiangzhu | 0.00, 0.06, 0.30, 0.64, 0.00 | IV | Intensive danger |
20 | Xinshan Village | 0.03, 0.10, 0.41, 0.46, 0.00 | IV | Intensive danger |
21 | Xin’an | 0.00, 0.07, 0.25, 0.68, 0.00 | IV | Intensive danger |
22 | Wumushu | 0.11, 0.50, 0.34, 0.05, 0.00 | II | General danger |
23 | Pulong | 0.02, 0.13, 0.66, 0.14, 0.06 | III | Obvious danger |
24 | Yituzhuang | 0.07, 0.18, 0.46, 0.30, 0.00 | III | Obvious danger |
25 | Luji | 0.11, 0.14, 0.65, 0.11, 0.00 | III | Obvious danger |
26 | Longshu | 0.03, 0.61, 0.26, 0.09, 0.00 | II | General danger |
27 | Makou | 0.08, 0.45, 0.36, 0.07, 0.05 | II | General danger |
28 | Wujia Village | 0.11, 0.11, 0.52, 0.26, 0.00 | III | Obvious danger |
29 | Huaizuo | 0.09, 0.33, 0.57, 0.01, 0.00 | III | Obvious danger |
30 | Dalishu | 0.08, 0.17, 0.50, 0.25, 0.00 | III | Obvious danger |
31 | Luhe Village | 0.07, 0.34, 0.51, 0.09, 0.00 | III | Obvious danger |
32 | Pumie | 0.15, 0.37, 0.48, 0.00, 0.00 | III | Obvious danger |
33 | Yanba | 0.08, 0.26, 0.57, 0.04, 0.06 | III | Obvious danger |
34 | Yinmin | 0.08, 0.36, 0.45, 0.06, 0.05 | III | Obvious danger |
35 | Tuobuka Town | 0.15, 0.18, 0.13, 0.54, 0.00 | IV | Intensive danger |
Num | Place Name | Risk Level | Num | Place Name | Risk Level |
---|---|---|---|---|---|
1 | Maowu Village | Extreme danger | 6 | Guxue Town | Obvious Danger |
2 | Rizhong Village | Intensive danger | 7 | Deze Village | General Danger |
3 | Riding Village | Intensive danger | 8 | Qugangding Village | General Danger |
4 | Xiayong Village | Obvious Danger | 9 | Benzilan Town | Slight Danger |
5 | Biyong Village | Obvious Danger | 10 | Zigeng Town | Slight Danger |
Num | Place Name | Risk Level | Num | Place Name | Risk Level |
---|---|---|---|---|---|
1 | Suba Town | Extreme danger | 5 | Tongkuangxi Village | Obvious Danger |
2 | Xiaojiangzi Village | Intensive danger | 6 | Tianjiashan Village | Obvious Danger |
3 | Yangba Village | Intensive danger | 7 | Tiaodungou Village | General Danger |
4 | Yaomoping Village | Intensive danger | 8 | Jianshe Town | General Danger |
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Fan, Q.; Tian, Z.; Wang, W. Study on Risk Assessment and Early Warning of Flood-Affected Areas when a Dam Break Occurs in a Mountain River. Water 2018, 10, 1369. https://doi.org/10.3390/w10101369
Fan Q, Tian Z, Wang W. Study on Risk Assessment and Early Warning of Flood-Affected Areas when a Dam Break Occurs in a Mountain River. Water. 2018; 10(10):1369. https://doi.org/10.3390/w10101369
Chicago/Turabian StyleFan, Qiang, Zhong Tian, and Wei Wang. 2018. "Study on Risk Assessment and Early Warning of Flood-Affected Areas when a Dam Break Occurs in a Mountain River" Water 10, no. 10: 1369. https://doi.org/10.3390/w10101369