Assessment of river naturalness based on grey relational analysis and analytic hierarchy process:A case study of Chaohe River
ZHANG Dong, ZHANG Hongjiang, MA Lan, SUN Yihui, GUO Kaili, CHENG Qiang
1. Beijing Engineering Research Center of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China;
2. Forest Resources Management Office of Shaanxi Forestry Department, 710082, Xi'an, China;
3. Soil and Water Conservation Bureau of Qinghai Province, 810001, Xining, China
Abstract：[Background] Riparian ecosystem functions play important roles in human society and economic development. An objective and systematic assessment method can provide theoretical support for the restoration and protection of riparian ecosystem. In this paper, the Chaohe River (river reach from Gubeikou Bridge to Xinzhuang Bridge) was taken as a case to study the method of river naturalness assessment based on the concept of "near-natural".[Methods]According to the natural quality and social service attributes of the Chaohe River, the river was divided into different sections. The 24 indicators were contained in the river naturalness assessment system, which involved 5 aspects including hydrological elements, river form, physical and chemical properties of water quality, riparian zone status, and the furaction of landscape and recreation. The investigation method of assessment indicators has been studied by reference to the "near-natural assessment system of stream". According to the judgment criteria of each indicator, the normalization processing was carried on according to the natural state, the near natural state, the degraded state and the artificial state. The weight of each indicator in the assessment system was calculated by the Analytic Hierarchy Process (AHP). Taken the measured value of the index as the reference series, referring to the criterion as the comparison sequence, the gray correlation degree was calculated by the point to range distance. The maximum degree of relevance covresponding to the natural level was the final evaluation result.[Results]The assessment results indicated that in the light of natural evolution and human activity interference, there were two river sections in artificial state, nine river sections in degraded state, four river sections in near natural state, and one section in natural state. On the basis of this assessment results, 1.2 km of the river sections were in artificial state, 12.58 km of the river sections were in degradation state, 6.6 km of the river sections were in near-natural state and 0.62 km of the river sections were in natural state which were about 6%, 60%, 31% and 3% of total length, respectively.[Conclusions]In general, although most of the survey sections of Chaohe River were in the state of degradation, there were still potential conditions for near natural restoration in the long run. It may promote river to a higher natural level to complete the river restoration based on river ecosystem assessment results and taking advantage of combination of natural ways and artificial management. Furthermore, evaluation index system has a high systematicness, the calculation was simplified and the indicators have an obvious impact on the result by the method of natural assessment of rivers based on AHP and Grey Relational Analysis(GRA).
张栋1, 张洪江1, 马岚1, 孙一惠1, 郭凯力2, 程强3. 基于层次-灰色关联分析的河流自然性评价——以潮河为例[J]. 中国水土保持科学, 2018, 16(3): 95-102.
ZHANG Dong, ZHANG Hongjiang, MA Lan, SUN Yihui, GUO Kaili, CHENG Qiang. Assessment of river naturalness based on grey relational analysis and analytic hierarchy process:A case study of Chaohe River. SSWC, 2018, 16(3): 95-102.
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2018, Vol. 16 
