Methodology and progress review workshop: Land use and land cover change, Erosion and Sedimentation assessment over the Koshi River basin

   TwitCount

The Koshi River Basin (KRB) harbors diverse topographic, climatic and biotic disturbance regimes with significant spatial and temporal dynamics. These landscape complexities of the river basin are reported to have significant impact on the hydrological system, specifically on runoff and sedimentation. The understanding of land surface forcing in terms of land use and land cover change (LULCC), soil erosion and sedimentation and their interrelationships is crucial for guiding river basin management strategy. In this context a study has been initiated as part of the Koshi Basin Programme (KBP) to develop comprehensive information on the historical patterns of LULCC. The study relies on multi-temporal satellite data and soil erosion and sedimentation assessment, and uses a suite of ground based measurements and modeling techniques.

The study is jointly implemented by ICIMOD, IGSNNR (China), IIT-Kanpur, and IIT-Gandhinagar (India), with active contributions from several partner organizations. Using diverse data, parameters and models, it aims to create a uniform understanding of the topic and improve linkages and flow between products. To that end, the workshop reviewed the current state of the research to ensure that research partners are using a uniform methodology for LCLUC analysis, soil erosion and sediment assessment. This paper provides the background, objectives and expected deliverables from the workshop. 

I. Land Use and Land Cover Change (LULCC) Dynamics

Study of LULCC is one of the important activities of KBP. It involves developing a multi temporal land cover database using satellite images collected during the decades 1990 - 2000 and 2000 - 2010. ICIMOD has more or less finished preparing LULCC datasets for three time periods. At the same time IGSNNR, China and Indian organizations like ISRO, Bihar Disaster Management Authority have also prepared datasets for their respective areas. In this context it is necessary to evaluate the homogeneity, relevance and applicability of the different datasets and the scope for merging them, and to assess the potential need for generating new products.

Objective

To evaluate available satellite datasets, land cover classification scheme, and land cover products of different organizations, and evolve a cohesive work plan for generating seamless land cover change products over KRB

Deliverable

Land cover classification system finalized
Role of each organization in developing time series land cover change products over the Koshi basin is identified.

I. Soil Erosion Assessment  

Soil erosion is strongly affected by Land Use and Land Cover Change. Spatially distributed erosion models are very helpful in assessing the expected effect of land use and land cover change on soil erosion. It is proposed that IGSNRR will develop a study on the spatial-temporal dynamics of potential soil erosion in the KRB based on an analysis of existing data and newly generated data using Revised Universal Soil Loss Equation. This will constitute a scientific basis and reference for future policy making on soil and water conservation measures in and around the KRB.
ICIMOD has collated published information on field-based soil erosion measurement data across Nepal and other relevant information required for running Revised Universal Soil Loss Equation model to estimate soil erosion at river basin level. A draft report is available which outlines the merits and demerits of the study and scope for improvement. However further research is needed to consolidate the real-time application of erosion data sets and the spatial and temporal scales on which these data sets are required and the level of accuracy required for such purposes. ISRO has also developed significant data sets and models relevant to soil erosion assessment studies. This will determine precision of input data and models to be followed and ground validation requirements.

Objectives:
To assess the spatial and temporal scales on which soil erosion data sets are required for the programme
To evaluate the data sets of different organizations and their respective methodologies in order to come up with a common methodology

Deliverable:
Datasets and methodology to be followed finalized and responsibilities of organizations identified

III. Sediment Assessment :
The KRB has been identified as a dynamic river that has shifted nearly 115 km westward in the last 200 years. One of the most distinctive characteristics of the Koshi is its high sediment load (in the range of 120--135 million tonnes/year). Materials that erode from the mountains and hills are transported and deposited in the plain areas. ICIMOD, in collaboration with IIT-Kanpur, IIT-Gandhinagar and Patna University, plans to investigate the spatial and temporal sediment dynamics in the KRB to understand its relationship with several river-related hazards. The study will use a multi-disciplinary approach ranging from remote sensing and GIS, sediment transport modelling and geochemical signature (trace element and radiogenic isotopic ratios) to understand sediment origin at the source, its transport and subsequent deposition. The results of this project will be useful in designing sustainable management plans for the KRB and in mitigating the associated hazards.

Objectives:
To assess data requirement and availability for sedimentation studies

Deliverable:
Data requirements for sediment studies are identified and agreed on
Partners agree on the spatial and temporal scale of erosion intensity output to be used for sediment study.


Programme Agenda

Day 1 : 29 September 2014

 

Inaugural session  

 

Time

Programme

Speaker/Facilitator

9:30

9:40

Welcome remarks

Dr Arun B Shrestha

9:40

10:00

Introduction of participants

Dr Santosh Nepal

10:00

10:15

Workshop background, need and linkages

Dr SM Wahid

10:15

10:30

Workshop briefing, schedule and conclusion

Dr MSR Murthy

 

 

Viewpoints/suggestions (stakeholders), if any

 

10:30

10:45

Group photograph followed by tea/coffee

 Mr Govinda Shrestha

Session 1: Land cover change dynamics

Chair: Dr MSR Mruthy

10:45

11:00

Background and programme requirements

Dr MSR Murthy

11:00

12:30

Presentations on available datasets, Classification scheme followed and products (15 mins+3 min QA)

 

 

 

Presentation by IGSNRR

Prof Zhang Yili

 

 

Presentation by ISRO

Dr V K. Dadhwal

 

 

Presentation by BSDMA

Dr Anand Vijeta

 

 

Presentation by IIT Kanpur

Dr Rajiv Sinha and Partners

 

 

Presentation by ICIMOD

Mr Faisal Mueen Qamer

12:30

13:30

Lunch break

 

13:30

15:15

Discussion and developing classification schemes

Dr MSR Murthy

 

 

Linkages to project needs/ Erosion and sediment studies

 

 

Methodology to be followed

15:15

15:45

Tea break

 

15:45

16:30

Roles and responsibilities and timelines

Dr MSR Murthy

Day 2 : 30 September 2014

Session 2: Soil erosion and sedimentation assessment

Chair: Dr. SM Wahid

9:30

9:45

Background, linkages and project needs

Dr Santosh Nepal

9:45

11:00

Presentations on soil erosion, available datasets and methodology/models followed

 

 

 

Presentation by IGSNRR (15 mins+3 min QA)

Prof. Zhang Yili

 

 

Presentation by IIT Kanpur

Prof. Rajiv Sinha and Team

 

 

Presentation by DHM Nepal (15 mins+3 min QA)

DHM Nepal

 

 

Presentation by ISRO (15 mins+3 min QA)

Dr V K. Dadhwal

 

 

Presentation by ICIMOD (15 min+3 min QA)

Mr Kabir Uddin

11:00

11:30

Tea break

 

11:30

12:30

Presentation on Sedimentation studies – Methodology and Data requirements (IIT Kanpur and Partners)

Prof. Rajiv Sinha and Partners

12:30

13:30

Lunch break

13:30

15:00

Discussion - Synthesis of Needs

Chair: Prof. Rajiv Sinha

 

 

Spatial and temporal scales, accuracies required, linkages and data flows

 

 

 

Input data and models to be used - Erosion and Sedimentation Studies 

 

15:00

16:00

Roles and responsibilities and timelines - Erosion and Sedimentation studies (working Tea Break)

 

16:00

16:30

Concluding session

ICIMOD, stakeholders

16:30

16:40

Vote of Thanks

ICIMOD