US 12,324,368 B2
Aerial seeding bioremediation method for coal mining subsidence area
Yinli Bi, Xi'an (CN); Shaopeng Ma, Beijing (CN); Yakun Gao, Beijing (CN); Longjie Zhang, Beijing (CN); and Huili Zhou, Beijing (CN)
Assigned to XI'AN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Xi'An (CN); and CHINA UNIVERSITY OF MINING AND TECHNOLOGY (BEIJING), Beijing (CN)
Filed by Xi'an University of Science and Technology, Xi'an (CN); and China University of Mining and Technology (Beijing), Beijing (CN)
Filed on Jan. 27, 2022, as Appl. No. 17/586,056.
Claims priority of application No. 202110178130.4 (CN), filed on Feb. 9, 2021.
Prior Publication US 2022/0248597 A1, Aug. 11, 2022
Int. Cl. A01C 21/00 (2006.01); A01C 7/08 (2006.01); B64U 101/32 (2023.01)
CPC A01C 21/00 (2013.01) [A01C 7/08 (2013.01); B64U 2101/32 (2023.01)] 2 Claims
OG exemplary drawing
 
1. An aerial seeding bioremediation method for a coal mining subsidence area, comprising steps of:
S1, obtaining a topographic map of the coal mining subsidence area;
S2, grading the topographic map in terms of ground slopes, wherein, in the step S2, the topographic map of the coal mining subsidence area is divided into a gridded mining area topographic map with grids of 50˜100 m so as to grade the ground slopes,
wherein, a standard for grading the ground slopes is as follows:
1) A slope which is <15° is a level-one slope; 2) a slope which is 15° ˜25° is a level-two slope; 3) a slope which is 25° ˜35° is a level-three slope; 4) a slope which is of 35° ˜60° is a level-four slope; and 5) a slope which is 60° ˜90° is a level-five slope;
S3, determining seeding coefficients of aerial seeding operation according to a grading result of the ground slopes and ground coverage rates of the coal mining subsidence area,
wherein, a slop seeding coefficient is obtained according to the grading result of the ground slopes;
a product of the slop seeding coefficient and a ground coverage seeding coefficient is a seeding coefficient of the aerial seeding operation; and
the ground coverage seeding coefficient is assigned a value according to a grade level of a ground coverage rate,
wherein, the ground coverage seeding coefficient is determined according to the following a)-d):
a) a ground coverage rate which is 80%˜100% is a level-one coverage rate, for which there is no need to sow grass seeds;
b) a ground coverage rate which is 50%˜80% is a level-two coverage rate, for which the ground coverage seeding coefficient is set to 0.5;
c) a ground coverage rate which is 20%˜50% is a level-three coverage rate, for which the ground coverage seeding coefficient is set to 0.8;
d) a ground coverage rate which is 0%˜20% is a level-four coverage rate, for which the ground coverage seeding coefficient is set to 1.0,
wherein, the slope seeding coefficient is obtained by Formula (1):

OG Complex Work Unit Math
in the Formula (1), a represents the slope seeding coefficient, and b represents a maximum slope within a grade level of ground slope;
S4, determining height adjustment parameters during unmanned aerial vehicle, UAV, aerial seeding, wherein, a height adjustment parameter is determined by Formula (2):
e=d×tan(b)  (2)
in the Formula (2), e represents the height adjustment parameter, d represents a UAV aerial seeding width, and b represents a maximum slope within a grade level of ground slope; and
S5, performing, by a UAV, the aerial seeding operation according the grading result of the ground slopes, the seeding coefficients of the aerial seeding operation, and the height adjustment parameters.