Table 5 shows the multi-year average precipitation (P), potential evapotranspiration (E0), runoff depth (Q), underlying surface parameter (n) (calculated using Fu's equation), and the elasticity coefficients of the three influencing factors (⁠⁠, ⁠, ⁠), calculated using Equations (9)–(11) for the study area during Period I and Period II. Figure 4 shows the relative rate of change in Period II compared to Period I (i.e., Figure 4 = (variable in Period II – variable in Period I) × 100/variable in Period I).
Table 5

Hydrometeorological characteristics and elastic coefficients of the study area during Period I and Period II

BasinPeriodP (mm)E0 (mm)Q (mm)nQ/PE0/P
HF I 413.4 968.7 45.2 2.49 0.11 2.34 2.41 −1.41 −3.07 
II 408.5 982.1 9.6 3.75 0.02 2.40 3.70 −2.70 −4.25 
KY I 409.3 1,051.7 77.7 1.99 0.19 2.57 1.92 −0.92 −2.85 
II 412.6 1,069.1 35.8 2.56 0.09 2.59 2.49 −1.49 −3.39 
WD I 425.6 1,066.1 45.0 2.44 0.11 2.51 2.37 −1.37 −3.20 
II 412.5 1,089.6 30.2 2.66 0.07 2.64 2.60 −1.60 −3.54 
YR I 467.7 996.1 37.2 2.90 0.08 2.13 2.80 −1.80 −3.13 
II 456.7 1,014.1 25.7 3.14 0.06 2.22 3.06 −2.06 −3.45 
FR I 500.1 1,031.0 41.6 2.91 0.08 2.06 2.80 −1.80 −3.05 
II 455.1 1,019.4 15.8 3.57 0.03 2.24 3.50 −2.50 −3.83 
BL I 538.6 921.9 34.4 3.63 0.06 1.71 3.46 −2.46 −2.88 
II 548.6 953.0 23.2 4.10 0.04 1.74 3.96 −2.96 −3.20 
JR I 548.8 907.4 43.5 3.46 0.08 1.65 3.27 −2.27 −2.67 
II 532.2 928.4 27.4 3.84 0.05 1.74 3.68 −2.68 −3.06 
YL I 690.5 1,085.5 160.3 2.24 0.23 1.57 2.07 −1.07 −2.01 
II 633.4 1,056.3 91.0 2.71 0.14 1.67 2.53 −1.53 −2.33 
QR I 635.6 998.3 93.8 2.79 0.15 1.57 2.58 −1.58 −2.21 
II 562.6 950.1 35.7 3.68 0.06 1.69 3.51 −2.51 −2.86 
BasinPeriodP (mm)E0 (mm)Q (mm)nQ/PE0/P
HF I 413.4 968.7 45.2 2.49 0.11 2.34 2.41 −1.41 −3.07 
II 408.5 982.1 9.6 3.75 0.02 2.40 3.70 −2.70 −4.25 
KY I 409.3 1,051.7 77.7 1.99 0.19 2.57 1.92 −0.92 −2.85 
II 412.6 1,069.1 35.8 2.56 0.09 2.59 2.49 −1.49 −3.39 
WD I 425.6 1,066.1 45.0 2.44 0.11 2.51 2.37 −1.37 −3.20 
II 412.5 1,089.6 30.2 2.66 0.07 2.64 2.60 −1.60 −3.54 
YR I 467.7 996.1 37.2 2.90 0.08 2.13 2.80 −1.80 −3.13 
II 456.7 1,014.1 25.7 3.14 0.06 2.22 3.06 −2.06 −3.45 
FR I 500.1 1,031.0 41.6 2.91 0.08 2.06 2.80 −1.80 −3.05 
II 455.1 1,019.4 15.8 3.57 0.03 2.24 3.50 −2.50 −3.83 
BL I 538.6 921.9 34.4 3.63 0.06 1.71 3.46 −2.46 −2.88 
II 548.6 953.0 23.2 4.10 0.04 1.74 3.96 −2.96 −3.20 
JR I 548.8 907.4 43.5 3.46 0.08 1.65 3.27 −2.27 −2.67 
II 532.2 928.4 27.4 3.84 0.05 1.74 3.68 −2.68 −3.06 
YL I 690.5 1,085.5 160.3 2.24 0.23 1.57 2.07 −1.07 −2.01 
II 633.4 1,056.3 91.0 2.71 0.14 1.67 2.53 −1.53 −2.33 
QR I 635.6 998.3 93.8 2.79 0.15 1.57 2.58 −1.58 −2.21 
II 562.6 950.1 35.7 3.68 0.06 1.69 3.51 −2.51 −2.86 
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Figure 4
Rate of change for the period before the abrupt change point (Period I) and after (Period II) (%).
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Rate of change for the period before the abrupt change point (Period I) and after (Period II) (%).

Figure 4
Rate of change for the period before the abrupt change point (Period I) and after (Period II) (%).
View largeDownload slide

Rate of change for the period before the abrupt change point (Period I) and after (Period II) (%).

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