نقش فرایندهای آب‌شناختی در ایجاد آبکند مبتنی‌ بر روابط مساحت- شیب در مناطق خشک استان مرکزی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار بخش تحقیقات حفاظت خاک و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان مرکزی- سازمان تحقیقات، آموزش و ترویج

2 دانشیار بخش تحقیقات حفاظت خاک و آبخیزداری- مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان فارس- سازمان تحقیقات، آموزش و ترویج کشاورزی

چکیده

فرسایش آبکندی، تهدیدی جدی در کمین جوامع بشری و محیط‌زیست است که با تمرکز جریان ایجاد می‌شود و متأثر از تغییرات پستی‌وبلندی، ویژگی‌های خاک و فعالیت‌های انسانی تشدید می‌یابد؛ ازاین‌رو در این پژوهش نوع فرایندهای آب‌شناختی مؤثر بر تشکیل آبکند در مناطق خشک استان مرکزی و در دو منطقه‌ی آبکندی رباط‌ترک و پیک‌زرندیه بررسی و آستانه‌ی مساحت-شیب در این دو منطقه تعیین شد. پس از برداشت مشخصات ریخت‌سنجی آبکندها، رابطه‌ی توانی مساحت- شیب برای آبکندها برقرار شد. نتایج نشان داد که در منطقه‌ی رباط‌ترک رابطه‌ی مساحت- شیب همبستگی زیادی دارد و توان b آن نیز منفی است. جریان سطحی همراه با تشدید فرسایشِ ناشی از عمل انحلال، در ایجاد آبکند این منطقه نقش داشت. در منطقه‌ی پیک‌زرندیه، همبستگی قوی در رابطه‌ی مساحت- شیب مشاهده نشد، ولی در تراز اطمینان 95% معنی‌دار بود. در این منطقه نیز تأثیر جریان سطحی و پدیده‌ی انحلال در تشکیل آبکند مشهود بود؛ ازاین‌رو افزون‌بر اهمیت اقلیم، با همگن‌سازی آبکندها براساس نوع کاربری می‌توان به مدل‌های بهتری دست‌یافت. به‌این‌ترتیب مقادیر واقعی‌تر از آستانه‌ی پستی‌وبلندی حاصل خواهد شد که شرایط محیطی منطقه را بهتر منعکس خواهد کرد.

کلیدواژه‌ها


عنوان مقاله [English]

The Role of Hydrologic Processes in Formation of Gullies Based on the Area-Slope Relationship in Arid Regions of Markazi Province

نویسندگان [English]

  • Aliakbar Davudirad 1
  • Majid Soufi 2
1 Associate Professor, Soil Conservation and Watershed Management Research Department, Markazi Agricultural and natural resources research and Education Center, Agricultural Research, Education and Extension Organization (AREEO)
2 Associate Professor, Soil Conservation and Watershed Management Research Department, Fars Agricultural and natural resources research and Education Center, Agricultural Research, Education and Extension Organization (AREEO)
چکیده [English]

Gully erosion is a serious threat to the society and environment of the study, primarily caused by surface runoff and dramatically accelerated due to rugged topography, soil properties and human induced factors. Therefore, the objective of this study was to investigate hydrologic processes affecting gully formation by topographic indexes in arid regions of the Markazi Province. Then threshold of the slope -area in the gully regions of Robattork and Pik-e Zarandie were determined. A logarithmic equation was developed using the morphometric characteristics of the gullies, the slope-area relationship at Robat-Tork was highly correlated and the b coefficient was negative. The investigations revealed surface flow with dissolution action was involved in this area. In the Pik-e Zarandie region, this correlation wasn't strong, but it was significant at the level 95%. In this region, the effect of surface flow and dissolution phenomenon on the gully formation was also evident. In addition to the importance of the climate, gully categorizing based on land use can be achieved with better models. Therefore, it is necessary to determine the indices of topographic thresholds that best reflect the conditions of the local physical environment and land cover/use.

کلیدواژه‌ها [English]

  • Markazi Province
  • processes of gully initiation
  • Soil loss
  • topographical thresholds

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