Assessment of land cover on soil erosion in Lam Phra Phloeng watershed by USLE model

Wattanasetpong, Jatuwat; Seeboonruang, Uma; Sirikaew, Uba; Chen, Walter

doi:10.1051/matecconf/201819202017

Cited by 1 publication

(2 citation statements)

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“…Rainfall is typically low, but is excessive in the rainy season, causing annual flooding. In 1967, the Thai Royal Irrigation Department (RID) operated the LPP dam, with a retention capacity of 170 million m 3 , to prevent floods in the rainy seasons and for irrigation in the dry seasons. This watershed has a major river, the Lam Phra Phloeng River, so sediment is eroded and moved into the LPP reservoir.…”

Section: General and Topographymentioning

confidence: 99%

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Impact of Climate Change on Soil Erosion in the Lam Phra Phloeng Watershed

Sirikaew

Seeboonruang

Tanachaichoksirikun

et al. 2020

Water

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Soil erosion plays a vital role in reducing reservoir capacity. The Lam Phra Phloeng (LPP) dams were built for flood protection and irrigation. However, they have experienced reservoir sedimentation, and the capacity of the reservoir has decreased. The surrounding soil surface was easily eroded and transported by heavy rainfall and surface runoff to streams and eventually into the reservoir. Understanding this soil erosion and sedimentation is necessary for preventing further decline of reservoir capacity and water management. This research aims to estimate long-term average annual soil erosion and predict sediment yield in the reservoir due to climate change. The methodology is determined soil loss parameters and sediment yield using the Universal Soil Loss Equation (USLE) with the Sediment Delivery Ratio (SDR). The USLE and SDR methods differed from field data, with an average absolute error of 4.0%. The Global Climatic Model, Institute Pierre Simon Laplace-Climate Model version 5A (IPSL-CM5A-MR), with Representative Concentration Pathways (RCP) 2.6, 4.5, and 8.5, was downscaled and analyzed to forecast future rainfall in the watershed. The high intensity of rainfall contributed to higher soil erosion, in RCP 8.5. Interestingly, the high and very high-risk areas increased, but the moderate risk area declined, indicating that the moderate risk area should be a priority in land management. However, the heavy rainfall and high slope gradient led to a slight increase in the soil erosion in some areas because the land covers were evergreen and deciduous forest. The prediction of sediment yield was positively correlated with the intensity of rainfall in the central part of the watershed, because the rainfall and runoff led the sediment to the river and streams, indicating that the land cover should be managed to prevent capacity decline.

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Section: General and Topographymentioning

confidence: 99%

“…Nowadays global disasters are being caused by human activity and climate change [1,2]. One problem is soil erosion, affecting the ecosystem, public utility system, and agricultural productivity [3]. Several factors affect soil erosion, such as water, ice (glacier), snow, air (wind), plants, animals, and human action [4].…”

Section: Introductionmentioning

confidence: 99%