Table 1. Median travel times for dispersal scenarios from the Modoc Point Road Bridge to fixed larval catch sites in the Williamson River and Upper Klamath Lake, Oregon, May 14–July 24, 2009. 


[Scenario: ∆disp, maximum difference in travel times between all dispersal scenarios; ∆speed, maximum difference in travel times between all speed scenarios; ∆elev+, difference in travel times between scenarios C+ and C; ∆elev-, difference in travel time between scenarios C- and C; ∆2007, difference in travel time between scenarios C-2007 and C; ∆2008, difference in travel time between scenarios C-2008 and C. Also shown is the ratio of R_E/A of the cumulative number of particles that exited the domain at the lake outlet to the cumulative number of particles that reached the age limit of 46 days at the end of the simulation. Abbreviations: N, number of particles sampled; p50, 50th percentile; OSU, Oregon State University; TNC, The Nature Conservancy; USGS, U.S. Geological Survey; –, no data]


Scenario	Near Williamson River channel												North delta			South delta			Upper Klamath Lake shoreline, north of Williamson River mouth
	TNC A			TNC B			USGS 25535			TNC D			USGS 25980			TNC C			USGS 25977			USGS 25976
	N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)
Comparison by dispersal type, based on 14,992 particles released
1A	553	1.1		276	2.2		538	2.1		167	4.3		265	9.4		263	8.0		201	11.3		150	13.9
2B	571	1.1		271	2.0		498	2.0		144	4.2		313	9.2		318	7.3		205	11.5		157	13.1
3C	608	1.1		295	2.1		519	2.1		157	4.3		290	9.4		345	7.2		204	10.7		156	13.9
4D	492	1.1		276	2.0		530	2.0		166	4.2		330	8.3		258	7.4		173	11.0		135	13.6
∆disp	–	0.0		–	0.2		–	0.2		–	0.1		–	1.1		–	0.7		–	0.8		–	0.8
Comparison by swim speed, based on 3,748 particles released
5C-1.2	147	1.1		73	2.1		118	2.2		35	4.3		82	10.1		112	7.1		60	12.0		41	13.8
C	149	1.1		61	2.1		129	2.1		42	4.2		71	9.3		89	7.3		43	10.2		38	14.5
6C-5.8	184	1.1		88	2.1		151	2.1		44	4.7		113	9.8		95	7.0		35	15.0		42	12.9
∆speed	–	0.0		–	0.0		–	0.1		–	0.5		–	0.8		–	0.3		–	4.8		–	1.7
Comparison by lake elevation, based on 3,748 particles released
7C-	94	1.2		51	2.1		81	2.0		33	3.4		74	8.9		0	–		48	10.9		57	11.0
C	149	1.1		61	2.1		129	2.1		42	4.2		71	9.3		89	7.3		43	10.2		38	14.5
8C+	113	1.1		59	2.3		73	2.5		35	4.1		43	11.1		96	4.2		14	21.8		15	20.3
∆elev+	–	0.0		–	0.0		–	-0.1		–	-0.8		–	-0.4		–	-7.3		–	0.7		–	-3.5
∆elev-	–	0.0		–	0.2		–	0.4		–	-0.1		–	1.8		–	-3.1		–	11.5		–	5.7
Comparison by shoreline configuration, based on 3,748 particles released
9C-2007	–	–		–	–		–	–		–	–		–	–		–	–		2	28.6		28	2.5
10C-2008	180	1.1		96	2.0		109	1.9		–	–		109	7.0		–	–		82	8.0		107	8.7
C	149	1.1		61	2.1		129	2.1		42	4.2		71	9.3		89	7.3		43	10.2		38	14.5
∆2007	–	–		–	–		–	–		–	–		–	–		–	–		–	18.4		–	-12.1
∆2008	–	0.0		–	-0.2		–	-0.2		–	–		–	-2.2		–	–		–	-2.2		–	-5.8

Scenario	Williamson River mouth, offshore			Williamson River mouth, in channel			Upper Klamath Lake shoreline, south of mouth						Upper Klamath Lake			Agency Lake								RE/A
	USGS 25981			OSU U6			OSU U5			OSU U4			OSU U8			USGS 25978			USGS 25979			OSU A1
	N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)		N	p50 (days)
Comparison by dispersal type, based on 14,992 particles released
1A	236	12.9		403	7.6		576	8.7		826	9.5		7	24.6		121	15.9		32	14.7		11	10.0	1.59
2B	264	12.9		350	7.4		500	7.9		734	9.5		16	32.0		149	14.4		52	16.0		8	14.1	1.34
3C	233	13.3		313	8.0		597	8.6		729	9.9		10	25.2		155	15.2		36	19.5		12	14.7	1.38
4D	186	12.0		255	6.5		497	8.0		658	9.0		14	29.3		135	12.0		33	14.0		17	15.0	1.44
	–	1.3		–	1.5		–	0.8		–	1.0		–	7.4		–	3.9		–	5.5		–	5.0	–
Comparison by swim speed, based on 3,748 particles released
5C-1.2	65	13.4		87	6.3		140	8.4		214	9.6		2	34.7		44	14.4		12	15.4		2	26.1	1.51
C	60	13.4		85	8.6		173	9.1		175	10.0		4	25.9		26	15.7		5	15.0		0	–	1.38
6C-5.8	61	12.6		78	7.0		114	7.4		176	9.4		10	29.4		50	17.0		16	15.4		5	26.2	1.11
∆speed	–	0.8		–	2.3		–	1.6		–	0.6		–	8.8		–	2.6		–	0.5		–	0.1	–
Comparison by lake elevation, based on 3,748 particles released
7C-	84	8.7		82	5.3		78	8.9		164	8.6		7	24.5		44	12.9		18	11.4		1	26.7	1.43
C	60	13.4		85	8.6		173	9.1		175	10.0		4	25.9		26	15.7		5	15.0		0	–	1.38
8C+	20	22.6		18	5.5		150	6.8		272	7.4		2	25.1		21	13.9		7	13.0		1	14.9	1.53
∆elev+	–	-4.6		–	-3.3		–	-0.2		–	-1.5		–	-1.3		–	-2.8		–	-3.6		–	–	–
∆elev-	–	9.2		–	-3.1		–	-2.3		–	-2.6		–	-0.8		–	-1.7		–	-1.9		–	–	–
Comparison by shoreline configuration, based on 3,748 particles released
9C-2007	177	2.1		109	2.0		72	4.3		188	5.2		5	18.4		0	–		0	–		0	–	1.75
10C-2008	110	7.6		63	5.7		37	11.0		134	10.5		5	20.8		68	11.8		20	14.5		2	15.5	0.98
C	60	13.4		85	8.6		173	9.1		175	10.0		4	25.9		26	15.7		5	15.0		0	–	1.38
∆2007	–	-11.3		–	-6.6		–	-4.8		–	-4.8		–	-7.5		–	–		–	–		–	–	–
∆2008	–	-5.8		–	-3.0		–	2.0		–	0.5		–	-5.0		–	-3.9		–	-0.4		–	–	–

¹Passive dispersal of tracked particles.


²Active dispersal by random swimming behavior with swim speed at 3.5 body lengths per second.


³Active dispersal by random swimming behavior with nighttime-only drift in the Williamson River channel with swim speed at 3.5 body lengths per second.


⁴Active dispersal by swimming downstream with currents at night, with nighttime-only drift in the Williamson River channel, and otherwise random swimming during the day, with swim speed at 3.5 body lengths per second.


⁵Scenario C with swim speed at 1.2 body lengths per second.


⁶Scenario C with swim speed at 5.8 body lengths per second.


⁷Scenario C with starting lake elevation 0.25 meter below observed elevation.


⁸Scenario C with starting lake elevation 0.19 meter above observed elevation.


⁹Scenario C with 2007 shoreline configuration.


¹⁰Scenario C with 2008 shoreline configuration.

First posted January 31, 2014