Mehdi Ketabchy - Academia.edu (original) (raw)

Papers by Mehdi Ketabchy

6 CP: 4.0×10 6 *based on Herb et al. 2010 and Rossman, 2009 **represents the current properties o... more 6 CP: 4.0×10 6 *based on Herb et al. 2010 and Rossman, 2009 **represents the current properties of roofs/pavement, or baseline scenario of pavements/roofs properties; ***RR: Residential Roof; CR: Commercial Roof; GR: Galvalume Roof; CP: Concrete Pavement ****H: Higher than baseline scenario; L: Lower than baseline scenario. ***** Scenario 10 represents assumption of 6-year concrete age, while scenario 9 assumed concrete pavement newly constructed.

Sustainability, 2021

Iran is suffering from a state of water bankruptcy. Several factors have contributed to the curre... more Iran is suffering from a state of water bankruptcy. Several factors have contributed to the current water resources bankruptcy, ranging from anthropogenic impacts, such as an inefficient agricultural sector and aggressive withdrawal of groundwater, to climatological impacts. This paper suggests that water resources mismanagement in Iran should be evaluated beyond the policy-makers decisions, as it recognizes that the bankruptcy has been intensified due to the structural and institutional form of the political system in Iran. This study discusses the roots of the water bankruptcy and identifies four major shortcomings caused by the political system: (1) the absence of public engagement due to the lack of a democratic and decentralized structure; (2) adopting ideological policies in domestic and foreign affairs; (3) conflicts of interest and the multiplicity of governmental policy-makers and sectors; and (4) a state-controlled, resource-dependent economy. Through the development of a ...

Environmental Monitoring and Assessment

Today's world is the world of information and its optimal management. Since major parts of th... more Today's world is the world of information and its optimal management. Since major parts of the decisions adopted by managers and urban planners at a regional macro level are somehow related to a specific situation with a location-source nature, the existence of precise, reliable and timely geographical information and its optimal management is necessary; Therefore there are no other options than using novel mechanized tools and technologies such as Geographic Information System (GIS) for their purpose. GIS enables environmental planners and decision makers for a time-efficient and cost-effective analyses. One of the most important parts of water and environmental management is quality studies of water resources such as rivers, estuaries, lakes, etc. In quality discussions of lakes and bays, the phenomenon of algal growth is of particular importance. Here, Tampa bay which is the part of the Gulf of Mexico and adjacent to the State of Florida is selected as the study area. By GIS ...

Sunlight plays an important role in regulating the nutrient cycle in streams. Throughout the year... more Sunlight plays an important role in regulating the nutrient cycle in streams. Throughout the years, more streams are buried to accommodate for residential or commercial facilities. This results in ...

Science of The Total Environment, 2021

Urban developments can result in higher runoff and nutrient loadings transported to downstream re... more Urban developments can result in higher runoff and nutrient loadings transported to downstream receiving waterbodies. While much effort has been made recently in watershed restoration in the U.S., a lack of recent runoff quality data limits the prediction capability of urban watershed models. The objectives of this study was to fill an existing information gap on how rainfall and land uses interact and affect such loadings. This study instrumented six coastal urban catchments, each dominated by a single land use. We measured total nitrogen (TN), total phosphorus (TP), total suspended solids (TSS), total Kjeldahl Nitrogen (TKN), ortho-P, and nitrate concentrations in runoff from 30 storm events over one year from six urban land uses, namely commercial, industrial, transportation, open space, low density residential, and high density residential. Results indicated that the median event mean concentrations (EMCs) for TSS, TP, and TN were 30 (19-34), 0.31 (0.26-0.31), and 0.94 (0.73-1.25) mg L-1, respectively. TSS EMCs from the open space and industrial land uses were significantly greater than other land uses; there were positive correlations between TN concentrations and imperviousness and between TP concentrations and turf coverage. Both the amount and intensity of rainfall positively influenced TSS concentrations in runoff regardless of land use. Using the collected data, this study developed a generic equation for predicting the loading of a pollutant as a function of rainfall depth. This equation was verified by comparing its predictions with the simulations of a sufficiently-calibrated water quality model in terms of TSS, TP, and TN loadings from various land uses in another coastal catchment for a period of ten years. Average TSS, TN, and TP loadings from the catchment were estimated to be 0.86, 0.03, and 0.01 kg ha-1 cm-1, respectively.

Environmental Modelling & Software, 2019

Hydrologic models such as the Storm Water Management Model (SWMM) and the Hydrologic Simulation P... more Hydrologic models such as the Storm Water Management Model (SWMM) and the Hydrologic Simulation Program-Fortran (HSPF) are widely used to evaluate the impacts of urban development on watersheds and receiving waters. We compare the ability of these two models at simulating streamflow, peak flow, and baseflow from an urban watershed. The most sensitive hydrologic parameters for HSPF were related to groundwater; for SWMM, it was imperviousness. Both models simulated streamflow adequately; however, HSPF simulated baseflow better than SWMM, while, SWMM simulated peak flow better than HSPF. Global Sensitivity Analysis showed that variability of streamflow for SWMM was higher than that of HSPF, while variability of baseflow for HSPF was greater than that of SWMM. Further, analysis of extreme storm events indicated that the runoff coefficient for SWMM was slightly greater than HSPF for recurrence intervals of 1, 2, 5, and 10-yr.; the opposite was the case for recurrence intervals greater than 10 yrs.

Science of The Total Environment, 2019

Environmental Science and Pollution Research, 2018

Journal of Environmental Management, 2018

Interciencia

RESUME La concentración de los contaminantes del aire en el ambiente es variable en función de di... more RESUME La concentración de los contaminantes del aire en el ambiente es variable en función de diferentes factores, incluyendo distancias de las fuentes principales. Industrias en las afueras son una de las con mucho más crucial fuentes de contaminantes del aire. Abyek es una de las fábricas de cemento más significativos situados en el centro de la carretera Teherán-Qazvin con la pila de emisión de PM10 hasta 70 g / s. Las concentraciones de PM10 se determinó en diferentes distancias de la fábrica luego se redactó la cifra entre la distancia y la cantidad de PM10. La figura gradiente de concentración mostró decaimiento exponencial, lo que demostró que aproximadamente el 50% de los contaminantes del aire se deterioró en las distancias entre 800 a 1000 m de la fábrica. Esto es seguido por que después de 1000 m de distancia de los contenidos y cantidad de partículas disminuyeron significativamente. La precisión de los datos se comprobó mediante el uso del modelo AERMOD. Entonces softwa...

Landscape improvement activities such as increase of green spaces can be utilized as an effective... more Landscape improvement activities such as increase of green spaces can be utilized as an effective stormwater management approach for urban runoff control. However, the efficiency of this approach at different return periods is being questioned. This study investigates the impact of landscape improvement on downstream flow hydrograph at different return periods in an urban catchment. The investigation is performed on the case study of Darakeh River which is a highly urbanized catchment located in Tehran, Iran. The city adopts channel network system for runoff control without utilizing novel stormwater management approaches (e.g., Low impact development). Increase in impervious surfaces as a result of urban development has intensified the risk of flooding and caused frequent overflows of the drainage network in the city. With the city restrictions on channel capacity enhancement, a greener advanced developmet is now being desired. It is therefore crucial to clearly understand the impa...

Russland-Analysen, Dec 5, 2023