Majid Soufi; Reza Bayat; Afshin Partovi
Abstract
Some parts of “morpho-climatic classification of Iran's gullies” national project in Soil Conservation and Watershed Management Research Institute, refer to the amount of produced sediments and reclamation measures for their management and the amount of damages resulting from their development. ...
Read More
Some parts of “morpho-climatic classification of Iran's gullies” national project in Soil Conservation and Watershed Management Research Institute, refer to the amount of produced sediments and reclamation measures for their management and the amount of damages resulting from their development. The results of this research indicate that Iran's gullies are categorized in two classes, small (<1 m) and medium gullies (1-10 m). One meter of gully has produced 19 m3 of sediment. Generally, they are distributed in rainfed lands and rangelands with loam, sandy loam and clay loam soil textures. The most important causes of gully formation and development are rangeland destruction, rangeland change to cropland and garden, and non-proper road and culvert construction. The present research showed that more than 50% of Iranian gullies had no management and reclamation measures, so that in 90% of some provinces and 30-50% in other areas, no management measures have been taken. More mechanical measures such as loose rock dams, rock and cement dams and gabions dams with the aim of sediment trapping are taken in Iran's provinces. Most measures are taken in small gullies, but just a few in medium ones. Management measures for prevention of gully formation are negligible in rainfed lands and serious attention is recommended to be paid to the design and construction of culverts and roads in mountainous and steep areas. Biological methods, blankets and rip-rap methods are used less in Iran. Demolition and abandoned old Ab-anbars had a role in have gully formation and development.
Seyed Masoud Soleimanpour; Majid Soufi; Mohammad Javad Rousta; Samad Shadfar; Ladan Jowkar; Hojatollah Keshavarzi
Abstract
Gully erosion is one of the main types of water erosion and is known as one of the destroying forms of land degradation and soil loss in the world. Therefore, knowing the most effective factors on extending this type of erosion is utmost important. Beside, management and control of gully erosion require ...
Read More
Gully erosion is one of the main types of water erosion and is known as one of the destroying forms of land degradation and soil loss in the world. Therefore, knowing the most effective factors on extending this type of erosion is utmost important. Beside, management and control of gully erosion require knowing the most effective factors on gullies extension. So, the present study was performed to determine the most effective factors on gullies in Khorrambid Watershed, North of Fars Province through measuring the permanent gullies during 13 years (2004-2016). Results showed that the average of gully length extension was 21.67 m throughout this period. This data indicated that the length of gully extension was 1.67 m per year. Further, it is determined that the length expansion of permanent gullies in this region was a function of bare soil and saturated electrical conductivity, using SPSS and backward multivariable regression. In conclusion, it is suggested different management solutions to increase the soil resistance against the erosion be prioritized in management and implementation plans such as increasing adoptable cover vegetation for the natural condition of the region and exclude the area to restore vegetation cover and pay more attention to control erosion in gully head cuts.
