Geomorphic changes after the 2021 Central European flood in the Ahr Valley by LiDAR-based differences

Environmental Sciences Europe

Table 2 The table displays calculated values for areal coverage in [m²], volumes in [m³], erosion (E) and deposition (D) ratios for areal coverage (A) and volume (V), and the net surface changes for areal coverage and volume for all subareas.

Area	_minLoD [cm]	Area [m²]		E_A/D_A	Net change Area [m²]	Volume [m³]		E_V/D_V	Net change Volume[m³]
Area		Erosion	Deposition			Erosion	Deposition
1	–	95,855	226,963	0.42	131,108	24,030	36,915	0.65	12,885
	7.4	42,257	126,066	0.34	83,809	22,354	33,371	0.67	11,017
	20	23,645	52,496	0.45	28,851	20,079	23,900	0.84	3,821
2	–	324,165	796,430	0.41	472,265	59,230	112,060	0.53	52,830
	7.4	140,826	402,021	0.35	261,195	52,866	97,333	0.54	44,467
	20	52,258	138,921	0.38	86,663	42,170	65,004	0.65	22,834
3	–	712,043	352,879	2.02	− 359,164	107,795	75,019	1.44	− 32,776
	7.4	357,227	183,520	1.95	− 173,707	94,117	69,070	1.36	− 25,047
	20	95,097	87,881	1.08	− 7,216	61,824	57,099	1.08	− 4725
4	–	70,819	199,211	0.36	128,392	42,071	63,858	0.66	21,787
	7.4	44,807	128,612	0.35	83,805	41,146	60,842	0.68	19,696
	20	29,770	65,786	0.45	36,016	39,291	53,293	0.74	14,002
5	–	156,178	96,313	1.62	− 59,865	31,242	23,070	1.35	− 8,172
	7.4	56,837	45,581	1.25	− 11,256	27,838	21,362	1.30	− 6,476
	20	28,936	20,652	1.40	− 8,284	24,497	18,278	1.34	− 6,219
6	–	36,796	61,342	0.60	24,546	6,727	15,071	0.45	8,344
	7.4	17,112	31,854	0.54	14,742	6,094	14,157	0.43	8,063
	20	7,205	16,131	0.45	8,926	4,888	12,197	0.40	7,309
x̄	–	232,643	288,856	0.91	56,213	45,183	54,332	0.85	9,149
	7.4	109,844	152,942	0.80	43,098	40,736	49,356	0.83	8,620
	20	39,485	63,645	0.70	24,159	32,125	38,295	0.84	6,170

Results are presented for three considerations of a minimum Level of Detection (minLoD) = threshold, which are no minLoD, the calculated technical minLoD of 7.4 cm, and the conservative assumed minLoD of 20 cm. The average (x̄) values for each characteristic are presented in the last row.