Impacts of grass basal diameter on runoff erosion force and energy consumption in gully bed in dry-hot valley region, Southwest China

Morphological characteristics of gullies affected by the soil type of artificial slopes in the Dry‐hot Valley Region, Southwest China

“…These soils are characterized by low fertility, limited organic matter content, an inadequate soil aggregate structure, and susceptibility to desertification (He & Huang, 1995;Qian & Ling, 1989). As a consequence, gullies are well developed, among which the soil erosion rates can range from 8,000 to 20,000 tÁkm À2 Áa À1 , with the mean distribution density of gullies varying from 3 to 5 kmÁkm À2 and reaching a maximum density of 7.4 kmÁkm À2 (Yang et al, 2022;Zhong, 2000) (Figure 2). Over the past few decades, to mitigate gully erosion, increase agricultural area, and upgrade land quality, a series of land consolidation projects aiming to "level gullies into arable land" have been implemented in the Dry- hot Valley Region.…”

“…As a result, a large amount of farmland (approximately 7,000 hm 2 ) has been newly reclaimed, accompanied by many artificial slopes. However, because of extreme climate conditions, unique material compositions and inadequate protective measures, these artificial slopes are highly susceptible to soil erosion, and the erosion modulus can reach as high as 8,000 tÁkm À2 Áa À1 , resulting in a new main source of sediment in the study area (Yang et al, 2018) (Figure 3).…”

“…Because of the extreme climate conditions, unique material composition and inadequate protective measures, these artificial slopes are highly susceptible to gully erosion, and the soil erosion rate can reach up to 8,000 to 20,000 tÁkm À2 Áa À1 , accounting for a major sediment source in the Jinsha River basin (Yang, 2017;Yang et al, 2018). Unfortunately, until recently, there has been a lack of research on the morphological characteristics of gullies on artificial slopes in the Dry-hot Valley Region.…”

Digital elevation model cell size effect on erosion‐deposition simulation using the unit stream power erosion and deposition model in the dry‐hot valley region of Southwest China

“…In addition, this area has a wide distribution of the Yuanmou Formation, which was divided into four sections and 28 layers that are composed of fluvial, lacustrine and paludal deposits (represented sequentially by sand, fine sand, clay, loam and interbedded gravel) and features a loose structure and high erodibility (Deng et al, 2015;Qian & Jiang, 1992). Due to the combination of rainy season's heavy rainfall and weak loose stratum in dry-hot valley region, gully erosion is well developed, among which the average gully distribution density ranges from 3 to 5 kmÁkm À2 with a maximum density of 7.4 kmÁkm À2 , and the soil erosion rates are estimated ranging from 8000 to 20,000 tÁkm À2 Áa À1 (Yang et al, 2022;Zhong, 2000).…”