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Origin of the water drained by the tunnel Graton; Origen de las aguas que drena el tunel Graton

Abstract

The research of the origin of the water drained by the Graton tunnel was attempted using isotope techniques. During the period of studies (April 1989-October 1992), four field work was executed to sample waters for chemistry, stable isotope and Tritium analysis, an to inject tracers and verify the possible infiltration from the Rimac and Blanco rivers to the tunnel. The results of the stable isotope analysis show that the water drained by the Graton tunnel comes from a basin around 300 meters above the average altitude of the basin where the Graton is located. The Tritium analysis show that the water is relatively modern. Using the model of total mixing, the residence times of the water drained at the km 0.5 and 2.5 are in the order to 45 years. The conductivities of the water of the tunnel is higher than the Rimac river ones because the influence of mine water. The chemical analysis of the water sampled at the downstream end of the tunnel, show that the conservative ions of the water kept almost constant during more than two years. The results of the work with artificial tracer show that there is no significant leakage from the Rimac and  More>>
Authors:
Plata B, A; [1]  Rojas M, R [2] 
  1. International Atomic Energy Agency, Vienna (Austria). Dept. of Research and Isotopes
  2. Instituto Peruano de Energia Nuclear, Lima (Peru)
Publication Date:
Dec 01, 1992
Product Type:
Technical Report
Report Number:
INIS-PE-95-02
Reference Number:
SCA: 540311; PA: AIX-26:054480; EDB-95:107337; ERA-20:022350; NTS-96:004141; SN: 95001425407
Resource Relation:
Other Information: PBD: Dec 1992
Subject:
54 ENVIRONMENTAL SCIENCES; AQUIFERS; HYDROLOGY; TRACER TECHNIQUES; RIVERS; CHEMICAL ANALYSIS; GROUND WATER; ISOTOPE APPLICATIONS; PERU; STABLE ISOTOPES; TRITIUM; UNDERGROUND; WATER RESOURCES; WATER TABLES
OSTI ID:
77512
Research Organizations:
Instituto Peruano de Energia Nuclear, Lima (Peru)
Country of Origin:
Peru
Language:
Spanish
Other Identifying Numbers:
Other: ON: DE95632317; TRN: PE9500002054480
Availability:
INIS; OSTI as DE95632317
Submitting Site:
INIS
Size:
20 p.
Announcement Date:
Aug 07, 1995

Citation Formats

Plata B, A, and Rojas M, R. Origin of the water drained by the tunnel Graton; Origen de las aguas que drena el tunel Graton. Peru: N. p., 1992. Web.
Plata B, A, & Rojas M, R. Origin of the water drained by the tunnel Graton; Origen de las aguas que drena el tunel Graton. Peru.
Plata B, A, and Rojas M, R. 1992. "Origin of the water drained by the tunnel Graton; Origen de las aguas que drena el tunel Graton." Peru.
@misc{etde_77512,
title = {Origin of the water drained by the tunnel Graton; Origen de las aguas que drena el tunel Graton}
author = {Plata B, A, and Rojas M, R}
abstractNote = {The research of the origin of the water drained by the Graton tunnel was attempted using isotope techniques. During the period of studies (April 1989-October 1992), four field work was executed to sample waters for chemistry, stable isotope and Tritium analysis, an to inject tracers and verify the possible infiltration from the Rimac and Blanco rivers to the tunnel. The results of the stable isotope analysis show that the water drained by the Graton tunnel comes from a basin around 300 meters above the average altitude of the basin where the Graton is located. The Tritium analysis show that the water is relatively modern. Using the model of total mixing, the residence times of the water drained at the km 0.5 and 2.5 are in the order to 45 years. The conductivities of the water of the tunnel is higher than the Rimac river ones because the influence of mine water. The chemical analysis of the water sampled at the downstream end of the tunnel, show that the conservative ions of the water kept almost constant during more than two years. The results of the work with artificial tracer show that there is no significant leakage from the Rimac and Blanco rivers to the Graton tunnel. So far, it can be concluded as a preliminary approach that the Graton tunnel drains relatively modern water originated in another basin. The hydrodynamics of the area of study seems to include a large storage on underground water in the system. The topography, geology and isotopic composition of the water samples, points to the upper Mantaro river basin as the possible source of part of the water drained by the Graton tunnel. (authors). 20 p. 2 figs., 7 ills., 4 tabs.}
place = {Peru}
year = {1992}
month = {Dec}
}