Determination of soil–water characteristic curve variables

Kajian Analisis Perbandingan Jumlah Pemanfaatan Air Tanah

“…Di dalam tanah,sifat aliran mungkin laminar atau turbulen. Tahanan terhadap aliran bergantung pada jenis tanah, ukuran butiran, bentuk butiran, rapat massa, serta bentuk geometri rongga pori (Zhai dan Rahardjo, 2012). Untuk menghitung tekanan hidrostatis yang terjadi dalam tanah dapat digunakan persamaan Bernoulli yakni: …”

Relative Sensitivity Analysis of the Soil Water Characteristics Curve

“…Soil Water Characteristics Curve)은 불포화 토양 특성 구 명을 위한 가장 기본적이고 중요한 요인이며 (Satyamaga et al, 2013;Zhai and Rahardjo, 2012), 토양수분 공급 특성 구명에 중요한 요인이다 (Shao et al, 2009). 또한 SWCC는 포화수리전도도 (Ks: Saturated hydraulic conductivity)와 함께 불포화 토양의 수리학적 특성을 결정짓는 요인이지만 불포화 토양에 대한 토양물리학적 모델의 결정적인 입력 factor 결정이나 SWCC측정에는 오랜 시간과 노력이 소요된 다 (Chiu et al, 2012;Ghanbarian et al, 2015).…”

Effects of grain-size distribution and hysteresis on soil-water characteristic curve (SWCC)

“…The van Genuchten (1980) and equations are widely adopted in unsaturated soil mechanics (Yang et al, 2004;Gallage and Uchimura, 2010;Chin, et. al., 2010;Zhai and Rahardjo, 2012). Table 2.2 summarises the other unimodal SWCC equations found in the literature.…”

“…This is most important for bimodal SWCCs, as bimodal SWCC equations have more curve-fitting parameters, which may require more time and have higher potential for numerical error in the curve-fitting procedure. Another problem for existing bimodal SWCC equations is the non-uniqueness of parameters from curve-fitting, which means that different combinations of the parameters may produce the same SWCC (Wijaya and Leong, 2016;Zhai and Rahardjo, 2012). The non-uniqueness gives problems when correlating parameters with other soils properties.…”

“…The sigmodal SWCCs, called unimodal SWCCs, which are illustrated in Figure 1.1, are more commonly used in practice. Well-graded soils and uniform soils often give unimodal SWCCs (Fredlund et al, 2000;Zhai and Rahardjo, 2012;Li et al, 2014 Corey (1964), van Genuchten (1980) and…”