WEAP کی ویب سا ئٹ میں خوش آمدید
WEAP
WEAP کی شروعات کی Stockholm Environment Institute.


WEAP کےبارےميں

ابتدا
WEAP ھی کیوں؟
خدوخال
نیا کیا ھے ؟
نمونے کی سکرینیں
مظاھرہ
ایپلیکیشنز
مطبوعات
تاریخ اورکریڈٹ

WEAP کا استعمال
ڈاوٰن لوڈ
لایٰسنسنگ
رھنماے استعمال کنندہ
ٹیوٹوریل
ویڈیوز
وسائل

استعمال کنندہ کا فورم
بحث
ارکان کی فھرست
پروفائل میں تبدیلی کریں

‏اضافی خدمات
تربیت
یونیورسٹی کے مضامین
تعاون

ھمارےبارےمیں
SEI-US کا پروگرام براے آبی وسا ئل
براۓمھربانی ھمارے ساتھ رابطٰہ کریں

 ماحولیاتی خبریں
LEAP توانائ میں دلچسپی ھے؟
LEAP کے بارے میں پڑھیں: توانائ کی منصوبہ بندی کے لۓ SEI کے سافٹ وئر

استعمال کنندہ کا فورم

All Topics | Topic "Constraints"
Log in to post new messages or reply to existing messages.
 
Author پیغام
Janak Timilsena

Subject: Constraints   
Posted: 12/14/2009 Viewed: 12128 times
I am working to set the constraints for the groundwater extraction. I am running the model in daily time step. In my project, constraint is in annual basis (i.e. it can not exceed 90 mgd for wateryear). Some of the time steps could be more than 90 mgd and some of the time step could be less than 90 mgd, but end of the water year the average should not be exceeded 90 mgd. I have tried to use the following function in max flow volume;

PrevTSValue(Maximum Flow Volume[Million gal],1,365,1<90)

but it constraints everytime step, which i donot want.

Do you have any suggestion to incorporate this type of constraint in WEAP?
Jack Sieber

Subject: Re: Constraints   
Posted: 12/14/2009 Viewed: 12127 times
Very interesting idea! What you are trying to do is constrain the flow through the transmission link in the current timestep so that it doesn't push the average (over the past year) above some threshold (90 million gallons per day (MGD)). In order to do this, you need to calculate the flow in the current timestep that would cause the average to be exactly 90 MGD, then constrain the flow through the link to be at most this flow. The answer is to subtract the total flow over the previous 364 days from 90 * 365 to get the "available" flow for the current day. Also, you need to make sure the answer is not negative.

Max(0, 365 * 90 - PrevTSValue(Flow[MGD], 1, 364) )

Note: PrevTSValue(Flow[MGD], 1, 364) will sum up the flow, in MGD, over the previous 364 days.

Jack

Topic "Constraints"