Aims: The aim of this study was to investigate the effect of Diuron in vitro on the growth rate of Anabaena flos-aquae in order to determine the toxicity of diuron by calculating EC₁₀, EC₅₀, EC90, and MAC value for this alga to control flourishing in this phytoplankton.
Materials and Methods: In this experimental research, the growth rate of Anabaena flos-aquae was investigated under the influence of diuron. This experiment was conducted in 96 days with 6 treatments (0.0005, 0.009, 0.016, 0.03, 0.054, and 0.01 mg/l), 1 control group, and 3 repetitions of the treatments in 500cc Erlenmeyer flasks. The growth rate was measured, using cell counting, turbidimetric measurement, and chlorophyll a measurement methods. Then, achieved quantities of EC were used in four 500cc Erlenmeyer flasks and the concentration of algae was evaluated through cell counting in 24-hours periods during 96 hours. Using SPSS 17 software, one-way ANOVA was used to compare the increase percentages between different treatments.
Findings: Quantities of EC₁₀, EC₅₀, EC₉₀, and Mac value of this toxicant for the algae according to chlorophyll a concentration were reported 0.006, 0.01, 0.05, and 0.001 mg/l, respectively. The frequency of Anabaena flos-aquae was significantly different in presence of concentrations obtained from EC indices and decreased sharply in EC₉₀ quantities.
Conclusion: The use of diuron in the proposed concentrations reduces its risk from the perspective of toxicity and contamination of other components of the ecosystem and it is more effective in this group of algae.

The existence of a diverse range of hazards and crisis centers around the border cities represents the use of different planning approaches to resilience and reduce the damage caused by crises (both natural and abnormal) in these cities. Border cities are one of the most sensitive areas that can be vulnerable to the dangers if they are not prepared to deal with and are not properly equipped. In border cities, due to the special strategic and border position, special socio-cultural topography, special economic-political conditions, vulnerabilities and threats, special conditions in terms of risk prevail; Considering the strategic position of these areas and considering the conceptual territory, content in this research, the most important issues in the study of the border cities of Abadan and Khorramshahr in geo-strategic, geo-economics, geo-culture, physical and institutional dimensions are: border geostrategic position, heterogeneous socio-cultural structure, specific geographical and environmental conditions, environmental pollutants (dust and natural resources pollution), history of endangerment and political, ethnic and religious tensions in border cities and special economic, physical and social conditions resulting from the occurrence of the imposed war. According to the proposed cases, the scope of the present study, specifically the border cities of Abadan and Khorramshahr as the largest border cities of Khuzestan province, with an active economic field on a regional and national scale, studies the specific social and cultural context, the border-water location and the experience of the imposed war. What is needed is a revision of traditional planning approaches to urban hazards management and the use of new tools in planning (compilation of resilience scenarios). In this study, foresight and hazards management based on urban resilience scenarios are considered.
 
 
Methodology
The present study is "applied-theoretical" in terms of purpose, and based on the nature and method, it is "descriptive-analytical". Research Methods according to the purpose of the research, is a combination of quantitative-survey and qualitative methods. Data collection tools and information in this research have been done by studying library-documentary sources, field surveys (survey, obtaining expert opinions) and referring to relevant organizations. The statistical population of the present study is academic experts, experts and institutional-organizational managers who have sufficient knowledge and experience in the field of urban resilience and the field of study. These experts were selected and questioned based on the method of "purposive sampling (expert samples) and chain-referral ". For structural analysis of urban resilience drives based on the ability of experts to respond and the complexity of methods, steps and conditions of Delphi technique, a total of (45) academic experts, managers and institutional-organizational experts were selected as the sample. The indicators and drivers of this research are the selected dimensions of urban resilience, including social, economic, physical-infrastructural, ecological and hazards dimensions. In this regard, urban resilience drivers were identified according to the opinion of experts and expert opinions (Delphi technique) and then, these factors were prioritized based on the degree of importance and uncertainty, and the most key factors were identified using the cross-impact balance analysis method and "micmac" software. For scenario writing and questionnaire analysis, cross-impact balance method and "ScenarioWizard" software were used that finally with the opinion of experts, favorable and compatible scenarios of resilience of the studied border cities were developed.
 
Discussion of Results
In line with the main purpose of the present study, to extract the key drivers of resilience, the cross-impact analysis method was used to identify the impact of these drivers. According to analysis performed, among the 46 factors examined (by analyzing the direct and indirect effects and calculating the displacement coefficient of each of the variables in different conditions), (18) agents were extracted and selected as key drivers of resilience in the border cities of Abadan and Khorramshahr. For the sake of scenario compilation, based on (18) selected key drivers and effective on urban resilience, possible situations of urban resilience were formulated. In order to formulate possible situations through surveys and interviews with experts, a scenario basket was prepared for (18) key factors; based on the analysis and possible situations facing the resilience of the studied cities, a total of (54) different situations were plotted for (18) key drivers influencing resilience. Considering the size of the matrix and its dimensions with size (54 × 54), with the help of scenario software and based on the questionnaire data, combined scenarios that included all possible situations were analyzed, the output of which was "521 possible scenarios", "14 high compatibility scenarios" and "3 strong scenarios". Accordingly, three scenarios with very high scores were identified as strong (probable) scenarios in the resilience of the studied cities that among them, one scenario shows favorable conditions and the other two scenarios show critical conditions. It was also detected for believable scenarios (with high compatibility) (14 scenarios). Also (521) weak (possible) scenarios were identified that due to the large number of them, addressing this number of scenarios is not the purpose of this study.
 
Conclusion
Findings related to the analysis of urban resilience scenarios showed that most of the scenarios are in static situations (continuation of the existing trend in resilience of Abadan and Khorramshahr border cities) and critical. Out of the total number of possible scenarios, three scenarios were identified as "strong resilience scenarios" based on the total value of the adjustment value and the total impact score index. Among the strong scenarios, one scenario has favorable situations and the other two scenarios represent critical situations. In this regard, considering the prevailing situation of Abadan and Khorramshahr urban resilience drives, the best scenario is to select the first scenario drives, otherwise, the conditions governing the second and third scenarios and the continuation of the status quo will be the scenarios governing urban resilience drives. In general, it can be said that urban resilience based on scenario writing is a systematic and future-oriented approach to managing the existing and upcoming risks and challenge by creating integration and effective interaction between the dimensions of resilience, key drivers, considering resilience priorities and taking steps based on the presentation of strategies for turning unfavorable situations into favorable, on a local scale, regional and cross-border in the border cities of Abadan and Khorramshahr can be presented.
 
Keywords: Cross-impact balance analysis, Urban Resilience, Scenario Compilation, boundary cities, Hazards, Abadan and Khorramshahr.