TY - JOUR

T1 - Optimization of geometry of infiltrating wadis-trenches for MAR schemes with flash flood and treated wastewater pulses in desert dunes

AU - Kacimov, A.

AU - Al-Shukaili, A.

AU - Al-Mayahi, A.

AU - Al-Maktoumi, A.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Interdunal areas in Oman are contemplated for Managed Aquifer Recharge
(MAR) using flash flood and treated wastewater through the natural beds
of dune valleys or constructed channels (see Al-Shukaili et al., 2019)
which have a favorable dyad of porosity and hydraulic conductivity (m,
Ks) for infiltration. However, the geometry of these
channels, particularly the constructed once, can be optimized for
further enhancement of the efficiency and performance of MAR application
which is the scope of this study. We also present the results of sandbox
experiments and numerical simulations in HYDRUS.
Surface water impoundment in the channel during a single MAR-pulse lasts
for time Te. In triangular trenches of an initial water width
W0, depth H0 and length L, the dyad (W, H)
vanishes at t->Te. The sooner the water seeps from the
channel into the vadose zone, the better. The smaller the sizes of the
W0, H0, the better. Similarly to Kacimov (1992),
we formulate the cost function Cf ():
Cf =c0 Te +c1 W0
+c2 H0 (1)
where c0 (/hour), c1 (/m) and c2 (/m)
are "weight" constants.
Optimization problem: given L, volume of water to be infiltrated (fixed
cross-sectional area A0=H0W0), the
pentad (c0, c1, c2, m, Ks),
determine the slope of the trench ωπ , 0

AB - Interdunal areas in Oman are contemplated for Managed Aquifer Recharge
(MAR) using flash flood and treated wastewater through the natural beds
of dune valleys or constructed channels (see Al-Shukaili et al., 2019)
which have a favorable dyad of porosity and hydraulic conductivity (m,
Ks) for infiltration. However, the geometry of these
channels, particularly the constructed once, can be optimized for
further enhancement of the efficiency and performance of MAR application
which is the scope of this study. We also present the results of sandbox
experiments and numerical simulations in HYDRUS.
Surface water impoundment in the channel during a single MAR-pulse lasts
for time Te. In triangular trenches of an initial water width
W0, depth H0 and length L, the dyad (W, H)
vanishes at t->Te. The sooner the water seeps from the
channel into the vadose zone, the better. The smaller the sizes of the
W0, H0, the better. Similarly to Kacimov (1992),
we formulate the cost function Cf ():
Cf =c0 Te +c1 W0
+c2 H0 (1)
where c0 (/hour), c1 (/m) and c2 (/m)
are "weight" constants.
Optimization problem: given L, volume of water to be infiltrated (fixed
cross-sectional area A0=H0W0), the
pentad (c0, c1, c2, m, Ks),
determine the slope of the trench ωπ , 0

KW - 1807 Climate impacts

KW - HYDROLOGY

KW - 1829 Groundwater hydrology

KW - 1830 Groundwater/surface water interaction

KW - 1880 Water management

M3 - Article

VL - 11

JO - American Geophysical Union, Fall Meeting 2019

JF - American Geophysical Union, Fall Meeting 2019

ER -