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2019 Vol.52, Issue 9 Preview Page

Research Article

Water yield estimation of the Bagmati basin of Nepal using GIS based InVEST model

GIS기반 InVEST모형을 이용한 네팔 Bagmati유역의 물생산량 산정

Shiksha Bastolaa
,
Yeon Jeong Seongb
,
Sang Hyup Leec
,
Younghun Jungd*
쉬크샤 바스톨라a
,
성 연정b
,
이 상협c
,
정 영훈d*
aPh.D. Student, Department of Disaster Prevention and Environmental Engineering, Kyungpook National University
bPh.D. Student, Department of Disaster Prevention and Environmental Engineering, Kyungpook National University
cMaster’s Student, Department of Disaster Prevention and Environmental Engineering, Kyungpook National University
dAssistant Professor, Department of Disaster Prevention and Environmental Engineering, Kyungpook National University
a경북대학교 건설방재공학과 박사과정
b경북대학교 건설방재공학과 박사과정
c경북대학교 건설방재공학과 석사과정
d경북대학교 건설방재공학과 조교수
* Corresponding Author
30 September 2019. pp. 637-645
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Abstract

Among various ecosystem services provided by the basin, this study deals with water yield (WY) estimation in the Bagmati basin of Nepal. Maps of where water used for different facilities like water supply, irrigation, hydropower etc. are generated helps planning and management of facilities. These maps also help to avoid unintended impacts on provision and production of services. Several studies have focused on the provision of ecosystem services (ES) on the basin. Most of the studies have are primarily focused on carbon storage and drinking water supply. Meanwhile, none of the studies has specifically highlighted water yield distribution on sub-basin scale and as per land use types in the Bagmati basin of Nepal. Thus, this study was originated with an aim to compute the total WY of the basin along with computation on a sub-basin scale and to study the WY capacity of different landuse types of the basin. For the study, InVEST water yield model, a popular model for ecosystem service assessment based on Budyko hydrological method is used along with ArcGIS. The result shows water yield per hectare is highest on sub-basin 5 (15216.32 m3/ha) and lowest on sub-basin 6 (10847.15 m3/ha). Likewise, built-up landuse has highest WY capacity followed by grassland and agricultural area. The sub-basin wise and LULC specific WY estimations are expected to provide scenarios for development of interrelated services on local scales. Also, these estimations are expected to promote sustainable land use policies and interrelated water management services.

Keywords
Ecosystem service
Water yield
Landuse
InVEST
Planning and management

본 연구는 유역에서 제공하는 다양한 생태서비스 가운데 네팔의 Bagmati 유역의 물생산량(Water yield)을 산정하였다. 물 공급, 관개 수력 등 다양한 시설에 사용되는 물생산량 지도는 계획 및 관리에 도움이 되며 생태서비스의 공급과 생산에 의도하지 않은 부정적 영향을 줄일 수 있다. 여러 문헌들은 네팔 Bagmati유역에 대한 탄소저장과 식수공급과 같은 생태서비스 제공 연구에 중점을 두었으나 토양피복별 혹은 소유역별 물 생산량에 대한 연구는 매우 미흡했다. 따라서 본 연구에서는 네팔 바그 마티 유역에서 소유역 규모와 함께 유역의 총 물생산량을 계산하고 유역의 토지피복 유형별로 물생산량을 산정하기 위해 시작되었다. 이를 위해, 생태서비스 평가를 위해 가장 많이 사용되는 Budyko 수문학적 방법에 바탕을 둔 ArcGIS기반 InVEST Water Yield 모형이 사용되었다. 본 연구로부터의 결과는 단위면적(ha)e당 물 생산량이 소유역 5 (15216.32 m3 / ha)에서 가장 높았으며 소유역 6 (10847.15 m3 / ha)에서 가장 낮았다. 토지피복별 물생산량은 도시화지역에서 가장 높게 산정되었으며, 초원과 농경지가 도시화지역 다음으로 높게 산정되었다. 본 연구에서 산정된 소유역별, 토지피복별 물생산량은 지역 규모의 상호 관련 서비스 개발을 위한 효율적인 시나리오를 제공하고 지속 가능한 토지 이용 정책 및 상호 관련된 물 관리 서비스를 촉진시킬 것으로 기대한다.

키워드
생태서비스
물생산
토지피복
InVEST
계획관리
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 52
  • No :9
  • Pages :637-645
  • Received Date : 2019-06-03
  • Revised Date : 2019-09-11
  • Accepted Date : 2019-09-11
  • DOI :https://doi.org/10.3741/JKWRA.2019.52.9.637
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