In this paper, we focus on the importance of conducting the necessary tests either
field or laboratory in order to obtain realistic values for soil hydrodynamic parameters
allowing the best result to simulate the actual situation of any engineering
facility.
The importance of this research highlights in earth dams and dikes which have great
importance to economic, environmental and human. It is necessary to be complete
accuracy when creating a mathematical model to study stability of these structures. From
here comes the need to calculate these parameters rather than extracted from engineering
codes, that we will use them to simulate the effect of long rainfall on the distribution of
water content in the Hweez dam soil and hence its stability. We will build a mathematical
model for dam using PCSiWaPro® depending on transition flow chart. concerning that,
hydraulic conductivity and volumetric water content in the soil are functions of pore water
pressure. These equations with their functions give a smooth transition of the studied
model where the saturated state is considered as a special case of the used equations.
Clayey expansive soils are fine grained soil with a low strength. Its
swelling potential and shear strength are significantly affected by
the water content.
This research aims to study the effect of the initial water content
on both shear strength and the required displacement to reach the
maximum strength.
The performance of some barley genotypes was evaluated under rain-fed
conditions in Dara'a (Izra'a) during two successive growing seasons (2009-2010/
2010-2011) in order to determine the most relevant physiological traits, which
are genetically as
sociated with drought tolerance and grain yield. The trial was
laid out according to the factorial complete randomized block design, with
three replicates. The leaf area index (LAI) was significantly lower in the wild
relatives compared with the varieties and land races. Relative water content
was significantly higher during the second growing season (87.19%) compared
with the first one (71.57%). Solute leakage was significantly lower during the
second growing season (69.50%) compared with the first growing season
(76.49%). It was noticed that the genotypes which have achieved significantly
higher grain yields, could also maintain significantly higher relative water
content in the leaves, (Acsad176, Acsad1182 and Acsad60), and were superior in
maintaining membrane integrity, and leaf area index, indicating the
importance of such traits in improving drought tolerance and maintaining
production capacity.
This experiment was conducted at two ecologically different regions, Boka,
and Gellien, using 3 lines of X.triticosecale Wittmack (372, C.187, and C.G.2)
and 6 cultivars of wheat (5 of them were triticum durum Cham1, Cham3,
Cham5, Bohoth5, and Hau
rani, and one of triticum aestivum Cham6), to assess
the changes in water content and dry matter in the grains during the period
from anthesis to physiological maturity .The results showed that all genotypes
had the same moisture content curves, whereas it had seemed that the two
durum wheat cultivars (Cham1 and Bohoth5) exhibited a disturbance in the
moisture development curves in the first region, and the same observation was
noticed on (Cham1, Cham3, and Cham5) in the second region. However,
triticale lines had a higher test weight of 1000 grain compared with wheat
cultivars in the two regions, and there was a positive relationship between grain
fill duration and the weight of 1000 grain, whereas, there was a depression in
the test weight of wheat cultivars in the second region in comparison with the
first one, but it is associated with an increase of protein percentage, and this
might be attributed to temperature elevation during grain fill stage.
