sensitivity analysis of desertification status to the input parameters
Authors
abstract
abstract desertification could cause reduction of the ecological and biological potential of land which may occur both naturally and artificially. identifying and evaluating the effective factors in development of desertification is very important for better management of land. the aim of this research is to evaluate the sensitive input parameters in the desertification condition by using of artificial neural networks. the study area with 118658 hectars is located in south of neishabour township. during the past years, this area has been faced to increase in desertification rate due to some long consecutive periodic droughts, destruction of vegetation, converting of pasture lands to dry farms, water and wind erosion and unsuitable management of land use. after field studies preparation of aerial photos and satellite image, we prepared and analyzed the required layers in geographic information system. fao-unep method (1984) was used for assess the desertification rate. in this study vegetation condition, pasture condition, water and wind erosion and salinity has been defined and categorized as the factors in the status of desertification. after introducing the information to gis, based on fao-unep approach, the effective criteria were studied and map of desertification condition was achieved. the results showed that the desertification in northern parts of this area was serve which originated from the reduction of canopy, destruction of vegetation and water erosion and 62 and 30 percents of the whole studied area could be classified in moderate and slight conditions, respectively. furthermore, to compare the results and quantifying the weight of input parameters, a mathematical model of artificial neural networks was used. the result showed that the effect of vegetation, wind erosion and water erosion could not be ignored and should be seriously considered. but salinity parameter is less effective than other factors in desertification and confirmed with fao-unep method output. analysis of different error criteria especially mean square error with the value of 0.25 confirmed the accuracy of results.
similar resources
Sensitivity analysis of input parameters for pressure tube integrity evaluation
Pressure tubes in CANDU reactor are the most important components that contain fuel. The operating experiences show leaks and burst in pressure tubes over the past two decades. The integrity of pressure tubes is, therefore, key concern in CANDU reactor. Once a CANDU reactor put into operation, their integrity could be checked by in-service-inspection. However, comparing to the total number of p...
full textsensitivity analysis of viscoelastic models of the earth crustal deformation to input parameters based on outcome surface deformation field
the scope of this research is to investigate the effect of geometrical and physical input parameters in crustal viscoelastic deformation models. to do this analysis viscoelastic model of wang et al., 2006 is used. the increasing quality of data on time-dependent deformation of the earth's surface can be used to extract more details on the spatial and temporal development of earthquake-rela...
full textDiscounted Cash Flow Analysis Input Parameters and Sensitivity
Discounted cash flow analysis provides a means of relating the magnitude of expected future cash profits to the magnitude of the initial cash investment required to purchase an asset or to develop it for commercial production. The objectives of discounted cash flow analysis are to determine: < The net present value of a stream of expected future cash revenues and expenditures. < The rate of ret...
full textconsequence analysis of the leakage, ignition and explosion during high pressure sour gas injection process to the oil reservoir
there is no doubt that human being needs to become integrated with industry and industry needs to be progressed, daily. on the other hand, serious events in industrial units specially in oil industries has been shown that such damages and events are industry related ones. the consequence of such events and damages which resulted in chemical and poisoned explosions and loss of life and property ...
the analysis of the role of the speech acts theory in translating and dubbing hollywood films
از محوری ترین اثراتی که یک فیلم سینمایی ایجاد می کند دیالوگ هایی است که هنرپیش گان فیلم میگویند. به زعم یک فیلم ساز, یک شیوه متأثر نمودن مخاطب از اثر منظوره نیروی گفتارهای گوینده, مثل نیروی عاطفی, ترس آور, غم انگیز, هیجان انگیز و غیره, است. این مطالعه به بررسی این مسأله مبادرت کرده است که آیا نیروی فراگفتاری هنرپیش گان به مثابه ی اعمال گفتاری در پنج فیلم هالیوودی در نسخه های دوبله شده باز تولید...
15 صفحه اولMy Resources
Save resource for easier access later
Journal title:
آب و خاکجلد ۲۵، شماره ۲، صفحات ۰-۰
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023