 Full-text available
|
|
|
|
|
|
Vol.57,
No.2,
PP.57-98
Content:  PDF( 0.79MB ) Editorial Scope and Editorial Board:  PDF( 0MB )
|
|
| 1 |  | Examining the Characteristics of Shallow Groundwater Flow in a Slope and a Floodplain Through Groundwater Aeration Sound | | | 2 | | Differences Between Traditional and UAV-Based Surface Grain Size Surveys and Their Implications for Hydraulic Parameter Estimation 57(2):67-76Yi-Cheng Liu[1]* Chuan-Shun Yen[2] Hui-Pang Lien [3]* Corresponding Author. E-mail :  kenji700808@gmail.com.tw Show preview | PDF( 6.21MB ) | | Differences Between Traditional and UAV-Based Surface Grain Size Surveys and Their Implications for Hydraulic Parameter Estimation | 
Close | | Yi-Cheng Liu[1]* Chuan-Shun Yen[2] Hui-Pang Lien [3] |
AbstractSurface grain-size distribution (GSD) is a key factor controlling river hydraulics, bed stability, and soil
and water conservation design. Traditional field sampling provides high accuracy but is labor-intensive and limited by
terrain and safety constraints. UAV-based image analysis has emerged as an alternative approach, although fine-particle
detection remains challenging. This study evaluates UAV-derived surface grain-size analysis in the Puya River near
Xinmei Bridge, Taiwan, using 1,303 ground-truth measurements collected from upstream and downstream sampling plots. High-resolution UAV orthophotos were processed with BASEGRAIN software and compared with field data.Uncorrected UAV results show systematic underestimation of fine particles, leading to D₅₀ errors up to 50 %. Excluding particles smaller than 3 cm reduced D₅₀ and D₈₄ errors to approximately 10-20 %, significantly improving engineering
applicability.
Key Words: UAV-based image analysis, Surface grain size distribution, Manning’sn | 〔1〕Assistant Researcher. of Construction and Disasters Prevention Research Center, Feng Chia University, Taichung, Taiwan, R.O.C.
〔2〕Agency of Rural Development and Soil and Water Conservation, MOA
〔3〕Professor, Dept. of Water Resources Engineering and Conservation, Feng Chia University, Taichung, Taiwan, R.O.C. * Corresponding Author. E-mail : kenji700808@gmail.com.tw | Received: 2026/01/13
Revised: 2026/05/15
Accepted: 2026/07/03
|
|
|
| | | 3 | | Effects of Organic Amendments on Surface Runoff and Sediment Yield of Selected Erosion-prone Soils on Varying Geologic for- Mations at a Laboratory Scale 57(2):77-87Agim Leonard Chimaobi1 Igwe Charles Arinzechukwu2 Ihem Emmanuel Emengamgha1
Egboka Nzube Thaddeus1 Chukwu Ebelechukwu Daniel1 Aririguzo Bernadine Ngozi1
Ogu Christian Ekene3 Nwankwo Vivian Ijeoma1 Ekejiuba Chidiebere Igwegbe1
Osisi Adaku Felicia1 Afangide Akaninyene Isaiah1 Okoro Linus Chidi4* Corresponding Author. E-mail : Leonard.agim@futo.edu.ng Show preview | PDF( 0.87MB ) | | | | 4 | | Analysis of River Sediment Transportation and Sediment Yield in the Shihmen Reservoir Watershed | |
|
|
MAP
