scholarly journals Preliminary assessment of impact of roundwood forwarding on soil water permeability and water table level in commercial thinnings on mineral soils

2019 ◽  
Author(s):  
Janis Ivanovs ◽  
Raitis Melniks ◽  
Jelena Stola ◽  
Olga Frolova
Keyword(s):  
Soil Water ◽  
Water Table ◽  
Water Permeability ◽  
Preliminary Assessment ◽  
Water Table Level ◽  
Mineral Soils

scholarly journals Temporary Confined Water-Induced Landslide in the Binary Structure of a Gentle Slope: A Case Study of the Fanshantou Landslide

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 596
Author(s):  
Lei Wang ◽  
Yuequan Shang ◽  
Jun Zheng ◽  
Yingqiu Zhang
Keyword(s):  
Water Table ◽  
Water Permeability ◽  
Rainfall Intensity ◽  
Soil Layer ◽  
Confined Water ◽  
Mountainous Areas ◽  
Initial Water ◽  
Southeast China ◽  
Gentle Slope ◽  
Water Table Level

With the increase in rainfall, landslides occur on many gentle slopes in the mountainous areas of southeast China. Gentle slopes have a particular dual geological structure, i.e., the lower part is a gravel soil layer with good water permeability, and the surface layer is clay soil with relatively poor water permeability. Under conditions of heavy rainfall, a gentle slope with this structure is likely to collect temporary confined water. The intermittent creep of the upper slope is caused by the floating force of the temporary confined water, which causes landslide disasters. The conditions that bring about temporary confined water are related not only to the stratum structure, but also to the rainfall intensity and the initial height of the water table level. On the basis of the characteristics of the stratum of the gentle slope landslide on the front of Fanshantou Mountain, we constructed a hydrological model in GEO-STUDIO. We investigated the effect of different rainfall intensities and initial water table levels on confined water under continuous rainfall conditions and conducted a corresponding stability analysis. The results show that when both the initial water table level and the rainfall intensity are high, temporary confined water is formed rapidly, increasing the chance of a landslide disaster. The research results provide a theoretical basis for the treatment of landslides on similar gentle slopes in the mountainous areas of southeast China.

scholarly journals Impact of Biochar on Soil Water Permeability Coefficient During 2 Year Field Experiment

2020 ◽  
Vol 609 ◽  
pp. 012108
Author(s):  
Maciej Gliniak ◽  
Jakub Sikora ◽  
Urszula Sadowska ◽  
Agnieszka Klimek-Kopyra ◽  
Agnieszka Latawiec ◽  
...  
Keyword(s):  
Field Experiment ◽  
Soil Water ◽  
Water Permeability ◽  
Permeability Coefficient ◽  
Water Permeability Coefficient

The biology of two species of Engaeus (Decapoda : Parastacidae) in Tasmania. III. Habitat, food, associated fauna and distribution

1977 ◽  
Vol 28 (1) ◽  
pp. 95 ◽  
Author(s):  
PJ Suter ◽  
AMM Richardson
Keyword(s):  
Dissolved Oxygen ◽  
Geographical Distribution ◽  
Water Table ◽  
Freshwater Crayfish ◽  
Associated Fauna ◽  
Water Table Level ◽  
Burrow Structure ◽  
Study Sites ◽  
North Western ◽  
Temperature Water

The habitats of two apparently sympatric freshwater crayfish, Engaeus cisternarius and E. fossor, in north-western Tasmania were compared. At two study sites data on rainfall, temperature, water table level, dissolved oxygen and pH were collected. E. fossor occupies regions below the water table, whilst E. cisternarius occupies drier areas above the water table. The burrow structure, burrow fauna, ectofauna and food were compared. The geographical distribution of each species is discussed.

A descriptive model of the relationship between rainfall and soil water table

1980 ◽  
Vol 47 (1-2) ◽  
pp. 103-114 ◽  
Author(s):  
K. Rennolls ◽  
R. Carnell ◽  
V. Tee
Keyword(s):  
Soil Water ◽  
Water Table ◽  
Descriptive Model ◽  
The Relationship

scholarly journals SENSIBILIDADE DE PLANTAS DE SOJA AO REBAIXAMENTO DO NÍVEL FREÁTICO

Irriga ◽  
2005 ◽  
Vol 10 (2) ◽  
pp. 135-145
Author(s):  
Jocelito Saccol de Sá ◽  
Décio Eugênio Cruciani ◽  
Sérgio Nascimento Duarte ◽  
José Roberto Brito Pereira
Keyword(s):  
Soil Water ◽  
Water Table ◽  
Sao Paulo ◽  
Additional Treatment ◽  
Statistical Experimental Design ◽  
São Paulo ◽  
Level Control ◽  
Drainage Rate ◽  
Water Logging ◽  
Soybean Plants

SENSIBILIDADE DE PLANTAS DE SOJA AO REBAIXAMENTO DO NÍVEL FREÁTICO  Jocelito Saccol de Sá; Décio Eugênio Cruciani; Sérgio Nascimento Duarte; José Roberto Brito PereiraDepartamento de Engenharia Rural, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo,  Piracicaba - SP, [email protected].  1.      RESUMO A diversificação de culturas em terras baixas é de grande interesse em diversas regiões produtoras de arroz, no Brasil e no exterior. O cultivo de soja é uma opção economicamente viável para a ocupação dessas áreas em rotação e/ou em sucessão à orizicultura. Este trabalho foi realizado em casa de vegetação localizada em uma área experimental da ESALQ/USP, Piracicaba – SP, com o objetivo de avaliar os efeitos de rebaixamentos sucessivos do nível freático (NF) no desenvolvimento e na produtividade de plantas de soja, cv. BR-16, e identificar o estádio de desenvolvimento da cultura com maior sensibilidade à inundação do solo. O delineamento utilizado foi o inteiramente casualizado, em arranjo fatorial (2x5) com um tratamento adicional (testemunha), sendo os fatores estudados: período de desenvolvimento da cultura durante a inundação do solo (estádios V8 e R4) e rebaixamento do NF (10, 20, 30, 40 e 60 cm dia-1). As plantas de soja apresentaram maior suscetibilidade à inundação do solo durante o período vegetativo. As taxas de rebaixamento do NF influenciaram o desenvolvimento e a produtividade dessa cultura. O aumento da velocidade de drenagem reduziu os danos ocasionados às plantas pelo excesso de água no solo, principalmente no estádio menos tolerante a essa condição. UNITERMOS: inundação, coeficiente de drenagem.  SÁ, J. S.; CRUCIANI, D. E.; DUARTE, S. N. E PEREIRA, J. R. B. SENSITIVITY OF SOYBEAN PLANTS TO WATER TABLE DRAWDOWN   2 ABSTRACT Agricultural diversification in low lands is very important in several Brazilian regions and countries, especially in irrigated rice lands. Soybean is a viable economic option for low lands. This study was carried out in an experimental area at ESALQ/USP, Piracicaba, São Paulo – Brazil. The objectives were to estimate the effects of water table drawdown in the growth and crop yield of soybean cv. BR-16 and to identify the most sensitive crop stages to soil water logging. The statistical experimental design was a completely randomized one with factorial arrangement (2x5) one additional treatment (control) and four replications. The study was done in the V8 e R4 crop stages. The water table was lowered 10, 20, 30, 40 and 60cm per day, from initial level. Control plants where only irrigated without flooding. The soybean plants showed highest susceptibility to soil water logging in the vegetative stage. The water table drawdown rates influenced the development and productivity of soybean plants. The drainage rate increase reduced the damage caused to the plants by the water excess in the soil, mainly in the less tolerant stage. KEYWORDS: flooding, drainage coefficient.

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