Long-Term Rainfall Variability and Trends for Climate Risk Management in the Summer Monsoon Region of Southeast Asia

Table 5

Rainfall trend at the river basin level in three monsoons.

Basin	Kendall’s tau	Z value	value	Sen’s slope	Kendall’s tau	Z value	value	Sen’s slope	Kendall’s tau	Z value	value	Sen’s slope
	Dry intermonsoon (Feb–Apr)				Southwest monsoon (May–Oct)				Northeast monsoon (Nov–Jan)
Chao Phraya	0.0951	0.8648	0.3871	1.12	0.2390	2.1902	0.0285	3.58	−0.0488	−0.4380	0.6614	−0.11
Gulf of Thailand Coast	0.1000	0.9097	0.3629	1.78	0.0537	0.4829	0.6291	1.49	0.0902	0.8199	0.4123	0.59
Hong (Red River)	−0.0171	−0.1460	0.8839	−0.13	0.0659	0.5952	0.5516	0.84	0.0732	0.6626	0.5075	0.22
Irrawaddy	−0.0073	−0.0561	0.9552	−0.04	0.1732	1.5837	0.1133	2.83	−0.1805	−1.6611	0.0987	−0.38
Mekong	0.1171	1.0670	0.2860	1.07	0.2317	2.1218	0.0338	2.61	0.1073	0.9771	0.3285	0.34
Peninsula Malaysia	0.0146	0.1235	0.9017	0.44	0.2244	2.0554	0.0398	3.10	0.3537	3.2460	0.0012	5.05
Salween	−0.0122	−0.1010	0.9195	−0.08	0.1024	0.9322	0.3512	1.20	−0.0293	−0.2583	0.7961	−0.10
Sittang	0.0317	0.2808	0.7789	0.40	0.3927	3.6055	0.0003	10.63	−0.0659	−0.5952	0.5516	−0.21
Vietnam, Coast	0.1171	1.0670	0.2860	0.84	0.1561	1.4265	0.1537	2.67	0.3171	2.9091	0.0036	3.37