1 Laura Rodriguez Lozada Rosario Sanchez Flores Hongbin Zhan LOCATION AREA 2 P500 mm yr T20º C ET433 mm yr 5368 km² 5368 km² 36 potential transboundary aquifers have been identified in the MexicanUS border Sanchez etal 2016 ID: 794903
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Slide1
ALLENDE-PIEDRAS NEGRAS TRANSBOUNDARY AQUIFER: AN INITIAL MODELING ASSESSMENT
1
Laura Rodriguez Lozada
Rosario Sanchez Flores
Hongbin
Zhan
Slide2LOCATION AREA
2
P=500 mm/
yr
T=20º C ET=433 mm/
yr
5368 km²
5368 km²
Slide336 potential transboundary aquifers have been identified in the Mexican-U.S border (Sanchez et.al., 2016).
16 aquifers were identified as transboundary. Only 11 aquifers recognized officially as transboundary by Mexico and the United States
.The Allende-Piedras
Negras
aquifer between Texas
and Mexico
, has been identified as transboundary
but
has not been recognized officially by both countries or at international level.
The purpose of this work is to demonstrate hydrogeological linkages of this aquifer at transboundary level to offer new information that could support its identification and recognition at international level.
3
BACKGROUND
Slide4BACKGROUND
4
Previous studies:Castillo (2000), Boghici (2002), Lesser (2008) and Conagua
(2014).
M
ainly focused on the Mexico side.
Models developed for the central portion of the aquifer
.
Slide5BACKGROUND
5
Castillo (2000)
Boghici
(2002)
Lesser (2008)
Conagua
(2014)
Slide6OBJECTIVES
6
To include Texas and southern portions of the aquifer to better understand
the transboundary nature of the system
Boghici
(2002)
Slide7OBJECTIVES
7
To understand how groundwater flow across and near border region and determine significant variables of change
Modified from
Boghici
(2002)
Slide88
To update the aquifer model with recent information (water wells, remote sensing data)Model comparison using remote sensing data (
GRACE-Gravity Recovery And Climate Experiment)
Water budget analysis
SPECIFIC OBJECTIVES
Slide99
Forecasting groundwater under different scenarios (pumping rates, droughts)Evaluation of the application of the methodology in other transboundary aquifers
SPECIFIC OBJECTIVES
Slide10HYPOTHESIS
10Groundwater levels are significantly affected by higher pumping rates.
Severe drought periods affect groundwater levels.High pumping rates impacts water quality in the aquifer.
Slide11METHODOLOGY
11Aquifer geometry and delineation
Data collection on:Water levels measured from wells.Annual river flow rates from river gages.
Annual precipitation and evapotranspiration from remote sensing images (TMPA and GLDAS).
Slide12METHODOLOGY
12Data collection on:
GRACE water storativity changes (Gravity Recovery And Climate Experiment-total water
storativity
changes obtained from gravimetric measurements)
Hydraulic parameters selection
(n, K, T, S)
Slide13METHODOLOGY
LimitationsThis research is considering only the modeling on the quaternary and tertiary alluvium deposits (Reynosa-Goliad formations and alluvium deposits)
13
Slide14RESULTS
14
Burro Mountains
Rio Grande
Modified from
Grupo
Modelo
(2003)
Slide15RESULTS
15
Burro Mountains
Rio Grande
Aquifer recharge (conglomerate) by water infiltration-springs
Recharge
Artisan
Well
Springs
Agriculture wells
Nava-Zaragoza area
Slide16RESULTS
16
T = 0.4 m /s
2
TDS > 1000 ppm
Ss
= 0.001
n = Good (0.25)
b = 40 m (
Mx
) – 25 m (
Tx
)
K = 160 – 430 m/day
Slide17RESULTS
17
*Taken from CONAGUA (2011)
0 to -2 m water levels change from 2008-2011
Aug-09
Sep-11
Aug-12
Sep-08
Feb-10
Apr-15
-0.35 m from GRACE
300
m
i
Slide1818
PRECIPITATION (TMPA)
Identification of droughts from remote sensing data
TOTAL WATER STORATIVITY (GRACE)
TEMPERATURE (MODIS)
Slide1919
Infiltration from precipitation takes from 2 to 4 weeks to reach the water table
PRECIPITATION (TMPA)
TOTAL WATER STORATIVITY (GRACE)
Slide20CONCLUSIONS
20Using remote sensing data
to recognize the droughts described by Mexican institutions during past years. Combined parameters help identify dry and wet periods.
Allende –
Piedras
Negras
aquifer is a small area to
attempt an analysis based on GRACE. After comparing water
level changes of the period 2008-2011 and GRACE values, differences on water storage are considerable. It could be due to the low spatial resolution of remote sensing data.
Infiltration takes around 2 to 4 weeks to be reflected on the water table. It will be depending on the lithology of the aquifer, and can be an important feature to explain aquifer vulnerability to
droughts and recovery rates.