115 experimental data for dynamic scour depth and 114 experimental data for static scour depth were acquired from previous research (Rajaratnam 1982; Aderibigbe & Rajaratnam 1996; Ansari 1999; Ansari et al. 2003; Chakravarti et al. 2014; Amin et al. 2021; Kartal & Emiroglu 2021; Chen et al. 2022; Shakya et al. 2022). Previous studies have shown that for long-impinging jets, scour depth varies logarithmically with non-dimensional parameters, whereas it varies linearly for short-impinging jets (Aderibigbe & Rajaratnam 1996; Beltaos & Rajaratnam 1977; Amin et al. 2021). We divided the data into two parts based on the impinging height, i.e., short-impinging jet and long-impinging jet ⁠, respectively. The range of the initial parameters used in the previous studies to predict static and dynamic scour depths is shown in Table 1.

Table 1

Range of parameters taken by researchers to estimate the scour characteristics

S. no. .	Authors .	Nozzle dia. (mm) .	Jet height (cm) .	Jet velocity (m/s) .	Median size D50 (mm) .
1	Aderibigbe & Rajaratnam (1996)	4–12	4–52.3	2.65–4.45	0.88–2.42
2	Ansari et al. (2003)	8–12.5	15–30	1.3–5.75	0.27
3	Chakravarti et al. (2014)	8–12.5	15–30	5.12–9.84	2.8
4	Amin et al. (2021)	12.5	0–50	2.12–2.61	0.54–1.10
5	Kartal & Emiroglu (2021)	10–20	2–24	10–23	1.28
6	Shakya et al. (2022)	16.2	5–32	1.57–3.94	0.84–3.38
7	Chen et al. (2022)	8–12	5–45	1.105–7.184	2.54

S. no. .	Authors .	Nozzle dia. (mm) .	Jet height (cm) .	Jet velocity (m/s) .	Median size D50 (mm) .
1	Aderibigbe & Rajaratnam (1996)	4–12	4–52.3	2.65–4.45	0.88–2.42
2	Ansari et al. (2003)	8–12.5	15–30	1.3–5.75	0.27
3	Chakravarti et al. (2014)	8–12.5	15–30	5.12–9.84	2.8
4	Amin et al. (2021)	12.5	0–50	2.12–2.61	0.54–1.10
5	Kartal & Emiroglu (2021)	10–20	2–24	10–23	1.28
6	Shakya et al. (2022)	16.2	5–32	1.57–3.94	0.84–3.38
7	Chen et al. (2022)	8–12	5–45	1.105–7.184	2.54

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