River Discharge Estimation based on Sentinel-1 Inland Water Monitoring System and ASTER DEM

Table 1. Table 1River channel cross-sectional morphology and its related parameters
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Table 1. Table 1River channel cross-sectional morphology and its related parameters
断面形状断面面积A 水力半径R
$A = \frac{1}{2} (θ - s i n 2 θ) r^{2}$ $R = \frac{A}{P} = \frac{1}{2} [1 - \frac{s i n 2 θ}{θ}] r$
$A = \frac{1}{2} B h$ $R = \frac{B h}{2 \sqrt[]{B^{2} + 4 h^{2}}}$
$A = \frac{1}{2} (B + b) h$ $R = \frac{(B + b) h}{2 b + 2 \sqrt[]{{(B - b)}^{2} + 4 h^{2}}}$
$A = B h$ $R = \frac{B h}{B + 2 h}$

Table 2. Table 2Fitting equations for the meandering section of the river and the valley section

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Table 2. Table 2Fitting equations for the meandering section of the river and the valley section

	河曲段	府谷段
趋势线方程	$y_{1} = p_{1} + p_{2} x_{1} + p_{3} {x_{1}}^{2} + p_{4} {x_{1}}^{3} + p_{5} {x_{1}}^{4} + p_{6} {x_{1}}^{5} + p_{7} {x_{1}}^{6}$	$y_{2} = p_{1} + p_{2} x_{2} + p_{3} {x_{2}}^{2} + p_{4} {x_{2}}^{3} + p_{5} {x_{2}}^{4} + p_{6} {x_{2}}^{5} + p_{7} {x_{2}}^{6}$
趋势线格式	多项式	多项式
相关系数	0.988 5	0.990 8
参数名及取值	p₁=792.8;p₂=0.011 6;p₃=9E-05; p₄=3E-07;p₅=-2E-10; p₆=-1E-12; P₇=-7E-16	p₁=771.76;p₂=0.017 8;p₃=0.000 1; p₄=-6E-08;p₅=6E-11;p₆=-3E-13; p₇=2E-16

Table 3. Table 3Partial hydraulic parameter values （Fugu section）

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Table 3. Table 3Partial hydraulic parameter values （Fugu section）

日期	水面面积/m²	水面宽/m	水深/m
2015/6/15	59 217.139 46	121.342	1.974
2015/7/9	53 326.370 61	109.271	1.780
2015/8/2	61 695.016 08	126.424	2.060
2015/8/9	49 914.044 23	102.283	1.664
2015/9/2	50 225.959 05	102.918	1.675
2015/11/13	60 144.894 99	123.248	2.005
2016/4/5	52 704.507 56	108.001	1.757
2016/6/9	46 503.888 48	95.295	1.551
2016/8/20	48 675.954 40	99.742	1.623
2016/9/25	46 195.512 16	94.659	1.540
2016/10/14	49 295.905 23	101.012	1.644
2016/10/19	47 125.630 04	96.565	1.571
2016/10/26	53 946.402 02	110.542	1.799
2016/10/31	49 605.944 61	101.648	1.654

Table 4. Table 4Accuracy assessment at Hequ and Fugu
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Table 4. Table 4Accuracy assessment at Hequ and Fugu
河段精度参数
NSE RMSE（m³/s)
河曲段 0.89 37.92
府谷段 0.10 135.60

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. River Discharge Estimation based on Sentinel-1 Inland Water Monitoring System and ASTER DEM[J]. Remote Sensing Technology and Application, 2025, 40(2): 288

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