خط مشی دسترسیدرباره ماپشتیبانی آنلاین
ثبت نامثبت نام
راهنماراهنما
فارسی
ورودورود
صفحه اصلیصفحه اصلی
جستجوی مدارک
تمام متن
منابع دیجیتالی
رکورد قبلیرکورد بعدی
Document Type:Latin Dissertation
Language of Document:English
Record Number:54518
Doc. No:TL24472
Call number:‭1471086‬
Main Entry:Julian A. Scott
Title & Author:The influence of irrigation water on the hydrology and lake water balance of two small arid-climate lakes in Khorezm, UzbekistanJulian A. Scott
College:University of Nevada, Reno
Date:2009
Degree:M.S.
student score:2009
Page No:111
Abstract:Little is known regarding the origins and hydrology of hundreds of small lakes located in the western Uzbekistan province of Khorezm. Located in the Aral Sea Basin, Khorezm is a productive agricultural region, growing cotton, wheat, and rice. Irrigation is provided through an extensive canal network that conveys Amu Darya (AD) water throughout the province. The region receives on average ten cm/year of precipitation, yet this is exceeded 14 to 16 times by potential evapotranspiration. It is hypothesized that without irrigation runoff and infiltration, the lakes of interest will approach desiccation in this arid climate. This hypothesis is investigated by studying two lakes in the region, Tuyrekkul and Khodjababa. In June and July 2008, water samples were collected at these lake systems and throughout central Khorezm and analyzed for δ 2 H and δ18 O and major ion hydrochemistry to determine water sources. Water table and lake surface elevations were monitored, and the local aquifer characteristics were determined through aquifer tests. These data and climate data from Class A evaporation pans and meteorological stations were used to estimate the water balance of both lakes. Results of this work demonstrate that the waters sampled at both lake systems and throughout central Khorezm were evaporated from AD water to varying degrees. Large-scale pre-growing season leaching was identified as a possibly major recharge event for the regional groundwater. Together, the water balance, stable isotope, and major ion hydrochemistry data suggest that if irrigation ceases or is reduced such that excess water is no longer available, these and other lakes with similar hydrology may decrease in volume dramatically, potentially to the point of complete desiccation.
Subject:Earth sciences; Hydrologic sciences; 0388:Hydrologic sciences
Added Entry:M. S. Rosen, Laurel
Added Entry:University of Nevada, Reno