[Objective] The temporal and spatial characteristics of soil erosion in the Yellow River alluvial area of Northeast He'nan Province in 2019 were analyzed in order to provide reference data for regional soil erosion control

ecological environment construction

and economic and social development.[Methods] The study was conducted in Lankao County. The multi-source remote sensing images were used as the basic data to calculated wind erosion and water erosion modulus using a wind erosion model and the CSLE model. Soil erosion and its influencing factors for each half-month in 2019 were studied

and the characteristics of soil erosion in 2019 were comprehensively analyzed.[Results] ① The half-month U values changed over time

following an "M" shape. The values were higher during the 3rd-9th and the 21st-22nd half-month periods. The half-month value of W showed a "wave-like" change

where values were higher during the 13th-18th half-month periods. The values of R and the average values of B with respect to forest

garden

and grass first increased and then decreased with time during 2019; the former had higher values in the 9th-16th half-month periods

and the latter had higher values in the 12th-18th half-month periods. ② The half-month wind erosion modulus in Lankao County showed a "wave-like" shape. Wind erosion was strong in the 4th-9th and the 21st-22nd half-month periods. The cumulative wind erosion modulus for the entire year was in the range of 0-5 186.31 t/(km2·yr)

with an average value of 153.26 t/(km2·yr). The wind erosion modulus of Yifeng Township and Zhangjun Tomb Town was relatively high

and these high values were mostly located on irrigated land and mining land. ③ The half-month water erosion modulus in Lankao County first increased and then decreased with time. During the 12th-18th half-month periods

water erosion was relatively strong. The annual cumulative water erosion modulus ranged from 0-8 028.86 t/(km2·yr)

and the average value was 9.54 t/(km2·yr). There were strong water erosion areas in Dongbatou Township and Chengguan Town

mainly on mining land. ④ Soil erosion in Lankao County in 2019 occurred in 17 half-month periods

accounting for 70.83% of the year. During the 4th-9th half-month periods

Lankao County had the largest soil erosion area

and all of the erosion in this area was wind erosion. The area of soil erosion was 271.66 km2 in 2019

accounting for 24.34% of the county's area. Erosion was mainly due to mild wind erosion

accounting for 96.83% of the area of soil erosion. Wind erosion mainly occurred in Yifeng Township

Zhangjun Tomb Town

Guying Town

and Dongbatou Township. Water erosion mainly occurred in Yifeng Township.[Conclusion] Soil erosion in Lankao County in 2019 mainly occurred in the 4th-9th and 21st-22nd half-months

and was mainly in the form of mild wind erosion

mainly distributed in Yifeng Township

Zhangjun Tomb Town

Guying Town

and Dongbatou Township. Future efforts to monitor and prevent soil erosion should focus on erosion occurring on irrigated land and mining land during these time periods.