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اثر ژئومتری بر رده‌بندی منشأ جریان سیلابی در حوضۀ جنگلی ناپلاررود استان مازندران | ||
| اکوهیدرولوژی | ||
| مقاله 10، دوره 8، شماره 2، تیر 1400، صفحه 447-460 اصل مقاله (1.65 M) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2021.320551.1480 | ||
| نویسنده | ||
| کریم سلیمانی* | ||
| استاد گروه مهندسی آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| چکیده | ||
| نبود مطالعات در حوضههای جنگلی به دلیل موجود نبودن ایستگاههای هیدرومتری، همواره برنامهریزان را با مشکلات زیادی مواجه میسازد. حوضۀ آبخیز ناپلاررود که جریان دائمی طی سال دارد و در پاییندست خود نیز روستاهای زیادی را در بر میگیرد، میتواند در آینده با برنامهریزی اصولی و علمی زمینهساز توسعۀ منطقه باشد. در پژوهش حاضر سعی شده است با تحلیل هندسی حوضۀ آبخیز ناپلاررود بتوان برخی از ویژگیهای مهم آن را استخراج کرد. در تحقیق حاضر از 12 عامل فیزیوگرافی مؤثر بر منشأ جریان سیلابی استفاده شد. این عوامل شامل شیب بستر آبراهه، ضریب گردی، ضریب فشردگی، ضریب شکل، ضریب کشیدگی، طول مستطیل معادل، عرض مستطیل معادل، درصد شیب وزنی حوضه، جهت جغرافیایی، نسبت انشعاب، تراکم زهکشی و زمان تمرکز می‌شوند. به منظور تعیین منشأ جریان سیلابی، تمامی عوامل مؤثر نرخگذاری و وزن‌دهی شدند. سپس، با استفاده از روش آنالیز حساسیت تک‌متغیره به اولویت‌‌بندی عوامل مؤثر بر منشأ جریان سیلابی اقدام شد. با توجه نتایج آنالیز حساسیت سه عامل شیب بستر آبراهه، درصد شیب حوضه و تراکم زهکشی با وزنهای 42/7، 72/6 و 64/6 به عنوان سه عامل مهم در منشأ جریان سیلابی تعیین شدند. از بین عوامل مؤثر نیز سه عامل تراکم زهکشی، عرض مستطیل معادل و نسبت انشعاب نیز دارای وزن بهینۀ بیشتری نسبت به وزن اولیۀ اختصاص‌یافته به آنها بودند که نشاندهندۀ اهمیت این 3 عامل در منشأ جریان سیلابی در حوضههای جنگلی است. | ||
| کلیدواژه‌ها | ||
| تراکم زهکشی؛ خطر سیل؛ زمان تمرکز؛ ژئومتری؛ فیزیوگرافی | ||
| عنوان مقاله [English] | ||
| Effect of Geometry on Classification of Flood Flow Source in Naplarood Forest Watershed of Mazandaran Province | ||
| نویسندگان [English] | ||
| Karim Solaimani | ||
| University Academic member | ||
| چکیده [English] | ||
| Lack of studies in forest Watersheds due to the hydrometric stations absence always causes many problems for managers. The Naplarrood watershed, which has a permanent flow throughout the year and includes many villages downstream, can be the basis for the development of the region in the future with principled and scientific planning. In this research, it is tried to extract some of its important features by geometric analysis of Naplarrood Watershed. Therefore, in this study, 12 effective physiographic factors were used in the field of flood current origin. These factors include river channel bed slope, roundness coefficient, compaction coefficient, Horton coefficient, elongation coefficient, equivalent rectangle length, equivalent rectangle width, slope percentage, slope aspect, branch ratio, drainage density and time of concentration. Then, in order to determine the source of flood flow, all effective factors were rated and weighed based on the used data. Then, flood flow was prioritized using single parameter sensitivity analysis method, as the effective factors in the source. According to the results of sensitivity analysis, three factors of river slope bed, slope percentage and drainage density with weights of 7.42, 6.72 and 6.64 were identified as three important factors in the source of flood flow. Among the effective factors, three factors of drainage density, equivalent rectangle width and branching ratio had a higher optimal weight than the initial weight assigned to them, which shows the importance of these three factors in the origin of flood flow in forest basins. | ||
| کلیدواژه‌ها [English] | ||
| Geometry, Time of Concentration, Drainage density, Flood | ||
| مراجع | ||
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