ABSTRACT In recent years, changes i

ABSTRACT
In recent years, changes in catchments water balanc
e due to land use management have
become the main concern of water resources authorit
ies in Iran. Due to rapid population
growth and land use changes, especially constructio
n of Taleghan dam, Taleghan
catchment has undergone rapid changes such as urban
development, declining of
rangelands, and deterioration of environment and er
osion of soil resources by cultivating
the hilly lands along the slopes for wheat or barel
y production. The extent of rangeland
area shrinkage is substantial: from 83% during the
early stages of dam construction
down to 35% by the end of the study period. The ‘go
od’ rangeland area decreased to
5.90% from 34.49% while the poor rangeland increase
d from 19.04 to 23.35% during the
period of 1987 to 2007. These changes could potenti
ally have devastating impacts on
water balance of the catchment. The main objective
of this research was to examine the
effects of land use changes on water balance of the
Taleghan catchment before and after
the dam construction. The Soil and Water Assessment
Tools (SWAT) model was applied
for predicting water balance in the middle and outl
et of the catchment. The main input
data for simulation of SWAT are Digital Elevation M
odel (DEM), soil type, soil
properties, and hydro-climatological data. Comparin
g the water balance for 1987's land
use for the middle station (Joestan) and the outlet
station (Galinak) showed that surface
runoff was 21% of the precipitation for the upper p
art of the catchment and 33% at the
outlet. Total groundwater and lateral flows were 37
and 19%, respectively. The water
balance at the outlet was predicted for two other s
cenarios of 2001 and 2007. The results
showed 7.3% increase in surface runoff and 11.3 and
11% decrease in the lateral flow and
groundwater flow, respectively. These results indic
ated progressive increase in surface
runoff and decline in interflow and groundwater flo
w.Therefore, one of the main
challenges facing development planners is the contr
ol of the accelerated degradation of
the natural resources that has been taking place du
ring the last decade.

ABSTRACT 
In recent years, changes in catchments water balanc
e due to land use management have 
become the main concern of water resources authorit
ies in Iran. Due to rapid population 
growth and land use changes, especially constructio
n of Taleghan dam, Taleghan 
catchment has undergone rapid changes such as urban
 development, declining of 
rangelands, and deterioration of environment and er
osion of soil resources by cultivating 
the hilly lands along the slopes for wheat or barel
y production. The extent of rangeland 
area shrinkage is substantial: from 83% during the 
early stages of dam construction 
down to 35% by the end of the study period. The ‘go
od’ rangeland area decreased to 
5.90% from 34.49% while the poor rangeland increase
d from 19.04 to 23.35% during the 
period of 1987 to 2007. These changes could potenti
ally have devastating impacts on 
water balance of the catchment. The main objective 
of this research was to examine the 
effects of land use changes on water balance of the
 Taleghan catchment before and after 
the dam construction. The Soil and Water Assessment 
Tools (SWAT) model was applied 
for predicting water balance in the middle and outl
et of the catchment. The main input 
data for simulation of SWAT are Digital Elevation M
odel (DEM), soil type, soil 
properties, and hydro-climatological data. Comparin
g the water balance for 1987's land 
use for the middle station (Joestan) and the outlet
 station (Galinak) showed that surface 
runoff was 21% of the precipitation for the upper p
art of the catchment and 33% at the 
outlet. Total groundwater and lateral flows were 37
 and 19%, respectively. The water 
balance at the outlet was predicted for two other s
cenarios of 2001 and 2007. The results 
showed 7.3% increase in surface runoff and 11.3 and
 11% decrease in the lateral flow and 
groundwater flow, respectively. These results indic
ated progressive increase in surface 
runoff and decline in interflow and groundwater flo
w.Therefore, one of the main 
challenges facing development planners is the contr
ol of the accelerated degradation of 
the natural resources that has been taking place du
ring the last decade.

2234/5000

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ABSTRACT In recent years, changes in catchments water balance due to land use management have become the main concern of water resources authorities in Iran. Due to rapid population growth and land use changes, especially construction of Taleghan dam, Taleghan catchment has undergone rapid changes such as urban development, declining of rangelands, and deterioration of environment and erosion of soil resources by cultivating the hilly lands along the slopes for wheat or barely production. The extent of rangeland area shrinkage is substantial: from 83% during the early stages of dam construction down to 35% by the end of the study period. The ‘good’ rangeland area decreased to 5.90% from 34.49% while the poor rangeland increased from 19.04 to 23.35% during the period of 1987 to 2007. These changes could potentially have devastating impacts on water balance of the catchment. The main objective of this research was to examine the effects of land use changes on water balance of the Taleghan catchment before and after the dam construction. The Soil and Water Assessment Tools (SWAT) model was applied for predicting water balance in the middle and outlet of the catchment. The main input data for simulation of SWAT are Digital Elevation Model (DEM), soil type, soil properties, and hydro-climatological data. Comparing the water balance for 1987's land use for the middle station (Joestan) and the outlet station (Galinak) showed that surface runoff was 21% of the precipitation for the upper part of the catchment and 33% at the outlet. Total groundwater and lateral flows were 37 and 19%, respectively. The water balance at the outlet was predicted for two other scenarios of 2001 and 2007. The results showed 7.3% increase in surface runoff and 11.3 and 11% decrease in the lateral flow and groundwater flow, respectively. These results indicated progressive increase in surface runoff and decline in interflow and groundwater flow.Therefore, one of the main challenges facing development planners is the control of the accelerated degradation of the natural resources that has been taking place during the last decade.

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الملخص
في السنوات الأخيرة، والتغيرات في مستجمعات المياه balanc
وه بسبب إدارة استخدام الأراضي
أصبحت الشغل الشاغل للموارد المائية: هيئة
المنشأ في إيران. بسبب السكاني السريع
النمو والتغيرات في استخدام الأراضي، وخاصة هندسة البناء
ن من Taleghan السد، Taleghan
شهدت مستجمعات التغيرات السريعة مثل الحضرية
التنمية، تراجع
المراعي، وتدهور البيئة وإيه
osion من موارد التربة من خلال زراعة
الأراضي الجبلية على طول المنحدرات بالنسبة للقمح أو باريل
ذ الإنتاج. مدى المراعي
انكماش مساحة لا يستهان به: من 83٪ خلال
المراحل الأولى من بناء السدود
الى 35٪ بحلول نهاية فترة الدراسة. "انطلق
انخفضت التطوير التنظيمي" منطقة المراعي إلى
5.90٪ من 34.49٪ في حين أن الفقراء زيادة المراعي
د 19،04-23،35٪ خلال
الفترة من عام 1987 إلى عام 2007. وهذه التغييرات يمكن أن potenti
حليف لها تأثيرات مدمرة على
توازن الماء في مستجمعات المياه. الهدف الرئيسي
كان هذا البحث إلى دراسة
آثار التغيرات في استخدام الأراضي على توازن الماء في
مستجمعات المياه Taleghan قبل وبعد
بناء السد. التربة والمياه تقييم
تم تطبيق أدوات (SWAT) نموذج
للتنبؤ توازن الماء في الوسط وoutl
آخرون من مستجمعات المياه. المدخلات الرئيسية
البيانات لمحاكاة سوات هي الرقمي الارتفاع M
مركز Odel (ماركا)، ونوع التربة، والتربة
خصائص، والبيانات المائية المناخية. Comparin
ز الميزان المائي لسنة 1987 في أرض
استخدام للمحطة الوسطى (Joestan) ومنفذ
أظهر محطة (Galinak) أن السطح
جريان كان 21٪ من هطول للص العلوي
فن مستجمعات المياه و 33٪ في
منفذ. وبلغ إجمالي المياه الجوفية وتدفقات الجانبية 37
و 19٪ على التوالي. الماء
وكان من المتوقع التوازن عند مخرج لمدة الآخر الصورة
cenarios عام 2001 وعام 2007. النتائج
أظهرت زيادة 7.3٪ في الجريان السطحي و 11.3 و
انخفاض 11٪ في تدفق والجانبي
تدفق المياه الجوفية، على التوالي. هذه النتائج الهندية
الزيادة التدريجية ATED في سطح
الجريان السطحي وانخفاض في interflow والمياه الجوفية فلو
w.Therefore، واحدة من أهم
التحديات التي تواجه مخططي التنمية هو مقاولات
رأ من التدهور المتسارع لل
موارد الطبيعية التي قد تحدث دو
عصابة العقد الماضي .

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