scholarly journals Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1059
Author(s):  
Chai Zhang ◽  
Bing Liang ◽  
Lei Liu ◽  
Yong Wan ◽  
Qichen Zhu
Keyword(s):  
Water Content ◽  
Water Movement ◽  
Hydraulic Characteristic ◽  
Inversion Method ◽  
Dry Density ◽  
Characteristic Parameters ◽  
Flow Process ◽  
Permeability Model ◽  
Saturated Water ◽  
Saturated Water Content

The unsaturated hydraulic characteristics of waste soil are an essential basis for predicting and evaluating leachate migration and distribution in landfills. The saturated water content and permeability coefficient were measured, and a multi-step drainage monitoring experiment was conducted indoors at different dry densities, particle sizes, and degradation ages. Single and dual permeability models were adopted to determine the unsaturated hydraulic characteristic parameters of waste. Results show that dry density and particle size are the key factors affecting the saturated water content and permeability of waste. A single degradation age has little effect on it. Respectively, the saturated water content has a linear relationship with dry density, and permeability has an exponential relationship with dry density under limited experimental data. The overflow numerical inversion method can accurately obtain the unsaturated hydraulic characteristic parameters of wastes and summarizes the values of the unsaturated hydraulic characteristic parameters of wastes with different attributes in the literature and the results of this study. The dual-permeability model performed significantly better than the single-permeability model for water movement, suggesting that a dual-domain description is required for water flow in landfills.

Prediction of soil saturated water content using evolutionary polynomial regression (EPR)

2013 ◽  
Vol 60 (8) ◽  
pp. 1155-1172 ◽  
Author(s):  
Shokufeh Salehi Khoshkroudi ◽  
Mohammad Ali Gholami Sefidkouhi ◽  
Mirkhalegh Ziatabar Ahmadi ◽  
Meysam Ramezani
Keyword(s):  
Water Content ◽  
Polynomial Regression ◽  
Evolutionary Polynomial Regression ◽  
Saturated Water ◽  
Saturated Water Content

Addition of suitably-designed zwitterions improves the saturated water content of hydrophobic ionic liquids

2012 ◽  
Vol 48 (91) ◽  
pp. 11220 ◽  
Author(s):  
Yoritsugu Ito ◽  
Yuki Kohno ◽  
Nobuhumi Nakamura ◽  
Hiroyuki Ohno
Keyword(s):  
Ionic Liquids ◽  
Water Content ◽  
Saturated Water ◽  
Saturated Water Content ◽  
Hydrophobic Ionic Liquids

scholarly journals The Saturated Water Content of Liquid Propane in Equilibrium with the sII Hydrate

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6295
Author(s):  
Kayode I. Adeniyi ◽  
Connor E. Deering ◽  
Robert A. Marriott
Keyword(s):  
Water Content ◽  
Relative Difference ◽  
Dew Point ◽  
Helmholtz Equations ◽  
Liquid Propane ◽  
Saturated Water ◽  
Three Phase ◽  
Reference Quality ◽  
Saturated Water Content ◽  
Good Agreement

In order to prevent solids from forming during the transportation and handling of liquid propane, C3H8(l), the fluid is dehydrated to a level below the water dew point concentration for the coldest operating temperature. Thus, accurate calculation of the saturation water content for C3H8 is important to determine the designed allowable concentration in liquid C3H8. In this work, we measured the water content of liquid C3H8 in the presence of the structure II hydrate from p = 1.081 to 40.064 MPa and T = 241.95 to 276.11 K using a tunable diode absorption spectroscopy technique. The water content results were modelled using the reference quality reduced Helmholtz equations and the Sloan et al. model for the non-hydrate and hydrate phases, respectively. Calculations show a good agreement (an average difference of less than 12 ppm) when compared to our measurements. Furthermore, the model was also used for calculating the dissociation temperatures for three phase loci, where a relative difference greater than 5 K was observed compared to the literature, hence our previously model reported by Adeniyi et al. is recommended for three phase loci calculations.

Influences of Change of Plasma on CBR of Eolian Sand

2011 ◽  
Vol 250-253 ◽  
pp. 3120-3127 ◽  
Author(s):  
Chang Ning Jin ◽  
Yu Hong Zhang
Keyword(s):  
Water Content ◽  
Clay Particle ◽  
Dry Density ◽  
Mechanism Analysis ◽  
Particle Content ◽  
Clay Particles ◽  
Eolian Sand ◽  
Cbr Test ◽  
Saturated Water Content ◽  
Test Result

The plasma in the eolian sand, included silt particle and clay particle, change easily and hugely. For studying their influences on the strength property of eolian sand, mixed silt particles and clay particles in different proportion into the eolian sand to carry out CBR test. The test result indicates that, along with the increase of silt particle and clay particle content the CBR value also increases within a certain range, which indicates the increase of silt particle and clay particle content can firstly improve the gradation of eolian sand; after the gradation is improved can obtain large compaction dry density, and at the same time also can enhance the earth strength, included the CBR value. The range of silt particle and clay particle content made the CBR value increase is also very large: ≤40% when formed under dry state, and ≤45% when formed under optimum or saturated water content; if the water content in forming could be retained at all times, the former could be ≤55% and the latter still ≤45%. The mechanism analysis further indicates that, when there were no excessive silt particles and clay particles, in the large range of silt particles and clay particles changing from small to large, the engineering nature of eolian sand will be improved due to the improvement of gradation, which is advantageous to the extensive application of dry compaction process; but the eolian sand formed by dry compaction is defective on microstructure, and so the requirements for silt particle and clay particle content should be more strict in practical works.

Influence of leaf surface wax and leaf area to water content ratio on cuticular transpiration in western conifers, U.S.A.

1990 ◽  
Vol 20 (9) ◽  
pp. 1306-1311 ◽  
Author(s):  
Julian L. Hadley ◽  
William K. Smith
Keyword(s):  
Water Content ◽  
Leaf Surface ◽  
Leaf Water ◽  
Leaf Water Content ◽  
Forest Trees ◽  
Cuticular Transpiration ◽  
Saturated Water ◽  
Surface Wax ◽  
Saturated Water Content ◽  
Leaf Surface Wax

High cuticular water loss, desiccation, and leaf mortality during winter in conifers at alpine timberline represent especially dramatic examples of the ecophysiological importance of cuticular transpiration. However, little research has been conducted on the winter water relations of forest trees, even though recent evidence suggests a potentially high leaf mortality due, at least in part, to winter desiccation. Two factors that could have important influences on cuticular transpiration, leaf surface wax and the ratio of leaf area (A) to saturated water content (Mw), were compared for six conifer species common to the central Rocky Mountains, United States. Leaves were collected from forest trees at the end of winter (May) to compare the amount of leaf surface wax, cuticular conductance to water vapor (gc), and leaf water content. Decreases in relative leaf water content were much more linearly related to transpiration per unit saturated water content than either gc or A/Mw, separately. Only A/Mw appeared correlated with the rate of cuticular transpiration. Also, linear increases in gc occurred with increasing leaf water content. Estimated desiccation resistance during winter corresponded closely to the degree of drought tolerance characterized previously for each species based only on summer growth conditions. Thus, winter desiccation resistance may be an important, yet under-emphasized, ecological factor influencing conifer distribution patterns.

scholarly journals ESTIMASI TOTAL AIR TERSEDIA BAGI TANAMAN PADA BERBAGAI TEKSTUR TANAH MENGGUNAKAN METODE PENGUKURAN KANDUNGAN AIR JENUH

2019 ◽  
Vol 2 (4) ◽  
pp. 164
Author(s):  
Fitria Dwi Darmayati ◽  
Tarsicius Sutikto
Keyword(s):  
Water Content ◽  
Soil Texture ◽  
Empirical Equation ◽  
Tropical Regions ◽  
Pressure Plate ◽  
Available Water ◽  
Saturated Water ◽  
Saturated Water Content ◽  
New Equation ◽  
Plate Apparatus

ABSTRACT This research was about determine the water content using the method of saturated water content that has been carried out and were suitable in Canada, However, this method needs to be tested for tropical regions such as in Jember. This present study aimed to determine the accuracy and characteristics of the empirical equations that used in determine the water content using the method of saturated water content in several classes of soil texture. Soil samples consist of the Raung Mountains, Argopuro Mountains, and Southern Mountains zones which are expected to represent several texture classes. The empirical equation is Yfc = a + b (xfc), to determine the water content in the field capacity condition, Yw = a + b (xw), to determine the water content in a permanent wilt point condition. The empirical equation for total available water is AT = Yfc - Yw. Based on the results of the study obtained a new equation from the results regression analysis of the saturated water content value with the measurements of Pressure Plate Apparatuse results, named Yfc = -2.4742 + 0.6551 (x) and Yw = -16.949 + 0.557 (x). From the equation, then determined total available water based on the Karkanis Equation and the New Equation. The appropriateness test of the method of saturated water content using Graph 1: 1 was carried out on each total available water data (Karkanis equation and new equation) which results showed that the method was invalid to be applied to the study location (R2 = 0.0239). Key words: Total Available Water, Soil Texture, Pressure Plate Apparatus, Saturated Water Content ABSTRAK Penelitian mengenai penetapan kandungan air menggunakan metode pengukuran kandungan air jenuh telah dilakukan di Canada hasilnya sesuai untuk daerah tersebut. Namun metode tersebut perlu diuji untuk daerah tropika seperti di Jember. Penelitian ini dilakukan untuk mengetahui akurasi dan karakteristik persamaan empiris yang digunakan dalam penetapan total air tersedia dengan metode kandungan air jenuh pada beberapa kelas tekstur tanah. Contoh tanah terdiri atas zona Pegunungan Raung, Pegunungan Argopuro, dan Pegunungan Selatan yang diharapkan mewakili beberapa kelas tekstur. Persamaan empiris yang digunakan adalah Yfc = a + b(xfc), untuk kandungan air kapasitas lapang, Yw = a +b(xw), untuk kandungan air titik layu permanen. Persamaan empiris untuk total air teredia yaitu AT = Yfc - Yw. Hasil dari penelitian diperoleh Persamaan Baru dari hasil analisis regresi nilai kandungan air jenuh dengan hasil pengukuran Pressure Plate Apparatuse yaitu Yfc = -2,4742 + 0,6551 (x) dan Yw = -16,949 + 0,557 (x). Dari persamaan tersebut kemudian ditentukan total air tersedia berdasarkan Persamaan Karkanis dan Persamaan Baru. Uji kelayakan metode pengukuran kandungan air jenuh dengan menggunakan Grafik 1:1 dilakukan pada masing-masing data total air tersedia (Persamaan Karkanis dan Persamaan baru) yang hasilnya menunjukkan bahwa metode tersebut tidak valid/sahih untuk diterapkan pada lokasi penelitian (R2 = 0,0239). Kata Kunci : Total Air Tersedia, Tekstur tanah, Pressure Plate Apparatus, Kandungan Air Jenuh.

scholarly journals Study on Water Absorption–Dehydration Characteristics for SAP Composite Soil for Rainwater Harvesting

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2380
Author(s):  
Youwei Qin ◽  
Tao Yang ◽  
Siyuan Wang ◽  
Fangling Hou ◽  
Pengfei Shi ◽  
...  
Keyword(s):  
Water Absorption ◽  
Water Content ◽  
Rainwater Harvesting ◽  
Soil Column ◽  
Comparative Investigation ◽  
Absorption Capacity ◽  
Superabsorbent Polymer ◽  
Saturated Water ◽  
Saturated Water Content ◽  
Cinnamon Soil

As a water absorption material, superabsorbent polymer (SAP) has gained its popularity in agriculture and environmental remediations. This study conducted a comparative investigation on saturated water content of cinnamon soil mixed with SAP. Two SAPs, SAP1 and SAP2, with different behaviors were tested, where SAP1 is an organic superabsorbent polymer, and SAP2 is polyacrylic acid sodium salt polymer. The saturated water content of SAP composite cinnamon soil was investigated with the weighing method. The repeated water absorption capacity and dehydration behavior of SAP composite soil under different designed rainfall intensity were investigated with a soil column tester. The results showed that (1) cinnamon soil mixed with SAP increased the saturated soil water content, and SAP1 was more effective than SAP2; (2) SAP held strong water absorption ability and recycling efficiency with eight repeated absorption–dehydration tests; (3) the average dehydration time for SAP composite soil were 626 h and 1214 h under 5-year and 10-year design rainfall intensities.

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