Visibility of River Plume Fronts with an X-Band Radar

Table 1

Mean front intensity of the river plume front with respect to the wind speed and direction. The frequency is the number of images in the category. The three numbers shown in the breakdown denote the percentage of images assessed with front intensities of 0, 1, and 2, respectively.

	Wind direction
	NWN, N, NNE; SSW, S, and SSE	NW, NE; SW, and SE	ENE, E, ESE; WSW, W, and WNW
Wind speed [m/s]
>6
Mean front intensity	0.29	0.79	0.96
Frequency	35	199	1497
Breakdown [%]	(77, 17, and 6)	(38, 45, and 17)	(31, 42, and 27)
3, 4, and 5
Mean front intensity	0.24	0.36	0.60
Frequency	463	611	2284
Breakdown [%]	(80, 16, and 4)	(72, 21, and 7)	(54, 31, and 15)
1 and 2
Mean front intensity	0.07	0.16	0.24
Frequency	1321	427	465
Breakdown [%]	(94, 5, and 1)	(88, 8, and 4)	(81, 14, and 5)