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Northwest A&F University (2021)

Study of Water-soil Environmental Effect Analysis and Assessment on Water Resources Development in Inland River Basin in Arid Area

师彦武

Titre : Study of Water-soil Environmental Effect Analysis and Assessment on Water Resources Development in Inland River Basin in Arid Area

Auteur : 师彦武

Grade : Master 2021

Université : Northwest A&F University

Résumé partiel
The assessment indicator system of water-soil environmental effect has been established, which can be used to synthetically evaluate the influence degree to water-soil environment of water resources exploited by humanity, and examine its future development trend. Shiyanghe River Basin is a typical inland river basin, which was caused severe ecology problems by human over exploitation. It is a typical representative in whole dry land in Northwest of China.The paper takes the Shiyanghe River Basin as an example, analyses the regional water-soil environmental effect. Based on the analysis of the correlation of each factor of water-soil environment, the correspondent indicator is selected and the synthetic assessment indicator system starting from the connotation of the effect is worked out. The indicator system is a hierarchy system, and it is composed with one general aim, six guideline and thirty-two indicators. To reach the aim of reflecting entirely the degree of the effect, the general aim is decomposed with six aspects, which are water resource carrying capacity effect, surface water resource effect, groundwater resource effect, oasis and vegetation effect, soil salinification effect and land desertification effect. Water-soil environmental effect of water resources development is a complex system, it has fuzzy attribute, and can be synthetically evaluated by fuzzy comprehensive assessment. At the same time, the system is a poor information system with gray attribute, and it can be comparatively analyzed with gray relational assessment, which can make the assessment results more reliable and persuadable. By using the model, each county is evaluated. The Analytic Hierarchy Process was adopted, which supported by information entropy to decide the indicator weight. Some was discussed in the fuzzy synthetic assessment model, emphasizing on constructing the subordinate function and calculating the fuzzy matrix.In the paper, the degree of water-soil environmental effect is divided into five levels, namely, very strong, comparatively strong, middling, comparatively weak, very weak, which are represented by V, IV, III, II, I. The results indicate that the larger the value, the stronger the level of environmental negative effect. Based on the environmental status of the river basin in 1970, the upper reaches, middle and lower reaches in the river basin are evaluated, which are approximatively represented by the Gulang county, Liangzhou borough, Minqin county and Jinchang city.

Mots clés : Inland River Basin ;Shiyanghe River Basin ;Water-soil Environment Effect ;Indicator System ;Assessment Methods ;Fuzzy Synthetic Assessment ;Gray Relational Analysis ;

Présentation (CNKI)

Page publiée le 23 février 2022