Table 1 Comparison of the primary sediment-supply control indicator (PSCI) and the dominant physical processes contributing to the total sediment volume exchange (\({\Delta V}_{T}\)) at the 41 catchment-estuary-coastal systems considered.

Label	System name	Estuary surface area (km²)	Catchment area (km²)	Primary sediment-supply control indicator (PSCI)	Dominant processes contributing to \(\Delta {V}_{\mathrm{T}}\)
Label	System name	Estuary surface area (km²)	Catchment area (km²)	Primary sediment-supply control indicator (PSCI)	BI	BV	FS
B_000	Mar Muerto	247	1448	0.17058	X
B_067	Kaipara	780	5392	0.14466	X
B_090	Gabon	750	5925	0.12658	X
B_001	Lugana Superior	220	2028	0.10848	X
B_006	San Diego	107	1167	0.09169	X
B_111	Hue	100	1783	0.05609	X
B_093	Inhambane	110	2377	0.04628	X
B_137	Lisboa	320	8022	0.03989	X
B_315	Thuan An	110	3800	0.02895	X		X
B_104	Miani Hor	314	11,066	0.02838	X		X
B_317	Dyfi	17.3	670	0.02582	X
B_089	Muni	185	7995	0.02314	X
B_073	Cacheu	130	5797	0.02243	X
B_303	Tweed River	22.7	1066	0.02129	X
B_012	Tubarao Lagoon	120	5636	0.02129	X		X
B_301	Wilson	48	2263	0.02121	X
B_080	Freetown	206	11,110	0.01854	X		X
B_136	Setubal	110	6516	0.01688	X
B_019	Rio Chone	32	2311	0.01385	X		X
B_312	Exe	19.2	1402	0.01368	X
B_091	Zaire	520	40,989	0.01269	X		X
B_311	Mawddach	3.65	314	0.01160	X
B_308	Nambucca River	12.6	1090	0.01156	X		X
B_313	Conwy	5.6	502	0.01107	X
B_305	Hastings River	30	3594	0.00835	X		X
B_314	Teign	4.04	487	0.00830	X		X
B_316	Alsea	9.1	1225	0.00743	X		X
B_309	Bellinger River	8.2	1152	0.00712	X		X
B_139	Gironde	480	79,750	0.00602	X		X
B_304	Richmond River	38.4	6924	0.00555	X		X
B_095	Beira	130	23,830	0.00546	X		X
B_306	Shoalhaven	31.9	7087	0.00450	X
B_307	Macleay River	31.6	11,347	0.00278	X		X
B_017	Rio Deseado	90	38,743	0.00232	X
B_310	Bega River	3.8	1870	0.00203	X
B_071	Gambia	120	70,018	0.00171	X		X
B_318	Kalutara	1.75	2778	0.00063			X
B_140	Loire	55	103,552	0.00053	X		X
B_009	Columbia River	340	669,403	0.00051			X
B_319	Swan	52	121,000	0.00043	X	X
B_302	St Paul	1.02	20,281	0.00005			X

PSCI is the ratio between the estuary surface area and the river catchment area. Dominant contributing processes to the variation of \({\Delta V}_{T}\) are identified by examining the variations of the projected 50th percentile values of projected \({\Delta V}_{T}\) and the contributing processes (i.e., basin infilling (BI), basin volume change (BV), and fluvial sediment supply (FS)) over the 2020–2100 period (See Figure S1 and S2 of the Supplementary Information).

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