چكيده لاتين :
1- Introduction
Land use includes all types of land uses to meet different human needs. In other words, land
use refers to the type of human use of land, and this type of use is related to the value of the
land and (its) natural characteristics. To understand and identify, land use changes using
satellite data to provide a broad and integrated view of an area, reproducibility, easy access,
high accuracy of data obtained and high analytical speed, as well as performing the
classification process a suitable way to map land use. It is particularly widespread in
geographical areas. These changes include changes in the hydrological system, effects on
erosion, changes in soil physical and chemical properties, and vast changes in land surface
morphology, so studying land use changes is one of the (necessities). (The) rain study is the
cognition of the face of the earth. Identifying timely and precise land use changes is the basis
for a better understanding of the relationships and interactions between humans and land
resources. Soil erosion is one of the most important soil (in)fertility factors that nowadays is
increasing because of poultry manure loss.
2- Methodology
The data needed in this method include topographic maps, land use, hydrological basin,
soil, digital elevation model, slope of the area, as the input to the required model. Soil
information is one of the most basic data needed for soil erodibility. WLC model requires soil
map to scale with different soil physico-chemical properties such as soil texture, soil moisture
percentage, hydraulic conductivity, bulk density. 1: 40,000 was prepared and used by Ardebil
Province Natural Resources Department. Digital elevation map was prepared using 1: 25000
topographic map of the study area. In this research, using the topographic map of 1: 25000
scale and digital elevation modeling, the slope map of Agh Laghan Chay Watershed was
prepared. The lithology map of the study area was prepared using the 1: 100,000 Geological
Survey of Iran Geological Survey. In addition, the standardization-criticalization and weighing
methods have been used.
3- Results
The results show that in 1990 the overall accuracy was 95% and the kappa coefficient was
0.93, in 2000 the overall accuracy was 90% and the kappa coefficient was 0.97 and in 2018 the
overall accuracy was 93% and the kappa coefficient was 0.91. During the years (1990-2000-
2018), significant changes are noticeable, most notably the rangelands and the waste land,
which, due to intensive exploitation, gradually shifts its land to other uses such as residential
and agricultural areas, dry land, that have been assigned. Increased area of land use and
cropland and agricultural areas in 2000 and 2018, compared to 1990, indicate the degradation
of rangelands and the reduction of waste land, which will cause significant changes in the
morphological systems of the region, mainly to increase the rate erosion and sedimentation in
watersheds, reduction of groundwater recharge, destructive floods and other morphological
processes will be due to erosion zoning maps in the study area that in 1990 was very high risk
area of 1758/82 hectares. This class of danger per year 2000 and 2018, respectively 08/1912
and 25/1914 hectare is increased and the high class area in 1990, 59/4018, 78/4219 and
31/4481 to ha respectively in 2000 and 2018 is increased. In the erosion map of the years 1990-
2000-2018, mainly high-risk and high-risk areas are located in agricultural, orchard and
residential land uses; therefore, different land use changes in the area have caused changes in
the morphological trends of the area.
4- Discussion & Conclusions
Knowing the ratios of land uses and how they change over time is one of the most important
issues in planning and policy making. Soil erosion is a global problem that threatens land-use
such as changes in water resources. Land use changes are one of the most important issues in
the recent world which causes many changes in land surface systems, including geomorphic
systems. Land use is one of the most important factors in soil erosion. The results show more
accuracy of object-oriented classification. Studies also show that monitoring land use changes
using object-oriented methods yields better results when observing all parameters. In the study
of land use changes over the years 1990–2012, the results showed that there were major
changes in this period of time and It is related to dense rangelands that, due to intensive
exploitation, have gradually devoted their land to other uses, such as residential and
agricultural areas, and land use, and wasteland has declined over time and has become land and
agricultural land. According to soil erosion zoning maps in the study area of Agh Laghan
Chay, In the years (1990-2000-2018), mainly high risk and high risk areas are in land use,
agricultural, orchard, vegetation and high risk areas. Comfy and very comfy are located in
rangelands and man-made areas. The results also showed that the area of high risk class in the
years (1990 - 2000 - 2018) was 11.20, 12.20 and 12.22%, respectively, and the area of high
risk class in the years (1990-2000-2018), respectively. The order is 25.59, 26.65 and 28.29,
which is increasing like many high-risk classes, due to the increase in residential area. It seems
necessary to preserve natural areas, stabilize and legalize land use, erosion control and soil and
water conservation practices in the context of high erosion potentials, within the framework of
other conservation schemes. Get it. Civilians and governmental and non-governmental
organizations in the region can manage and monitor land use changes.
